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Grade 12 Physics national exam, 2017 E.C. (2025 G.C.)
60 questions · 120 minutes. The first 5 answers are shown with explanations; sit the whole paper timed in the app to get your score and the textbook page behind every question.
- 1.Block A of mass m₁ = 8.0 kg is travelling initially at u₁ = 6.0 m/s in the positive x-direction. It collides with block B of mass m₂ = 12.0 kg, which is moving in the same direction with velocity u₂ = 3.0 m/s. If immediately after the collision, the velocity of block A is v₁ = 4.0 m/s in the positive x-direction, find the velocity of block B (v₂) immediately after the collision.
- A. 4.33 m/s to the negative x-axis
- B. 3.71 m/s to the negative x-axis
- C. 3.71 m/s to the positive x-axis
- D. 4.33 m/s to the positive x-axis
Answer: D. The key idea is that total momentum stays the same during a collision. Using momentum conservation, $8(6)+12(3)=8(4)+12v_2$, so $v_2=52/12=4.33\,\mathrm{m/s}$ in the positive $x$-direction. A and B give the wrong direction; C gives the wrong speed. Textbook: Grade 11, unit 4 · section 4.6. - 2.A force that is exerted on a simple machine in order to produce input work is called
- A. friction.
- B. load.
- C. effort.
- D. normal.
Answer: C. The effort is the force applied to a simple machine to make it do work. Option C names this input force. Option A is friction, which resists motion. Option B is the load being moved, and option D is a support force from a surface. Textbook: Grade 9, unit 5 · section 5.5. - 3.Which one of the following statements is correct about transverse and longitudinal waves?
- A. The directions of wave motion and vibration of the particles are parallel for transverse waves and perpendicular for longitudinal waves.
- B. Waves on a string are longitudinal whereas sound waves are transverse.
- C. The directions of wave motion and vibration of particles are parallel for longitudinal waves but perpendicular for transverse waves.
- D. A longitudinal wave comprises a series of crests and troughs, whereas a transverse wave comprises a series of compressions and rarefactions.
Answer: C. The key difference is the direction of particle vibration compared with the wave’s direction of travel. In a longitudinal wave they are parallel, while in a transverse wave they are perpendicular, so C is correct. A reverses these directions. B swaps the types of waves on a string and sound in air; D swaps crests and troughs with compressions and rarefactions. Textbook: Grade 9, unit 6 · section 6.4. - 4.An object that is partially or fully submerged in a fluid experiences an upward force from the fluid. The apparent weight of the object is the weight of the
- A. fluid it displaces.
- B. object in air minus the buoyant force.
- C. object in air.
- D. fluid it displaces minus the buoyant force.
Answer: B. Apparent weight is the weight an object seems to have while in a fluid. The fluid’s upward buoyant force reduces the object’s weight, so apparent weight equals weight in air minus buoyant force. A is the buoyant force, not apparent weight; C is the weight in air; D subtracts the buoyant force from the weight of displaced fluid, not from the object’s weight. Textbook: Grade 12, unit 3 · section 3.3. - 5.m A force is used to push a box of mass, along the slope of an inclined plane with constant velocity. If the μ coefficient of friction between the box and the inclined plane be , the actual mechanical advantage (AMA) of the inclined plane is Question Diagram 1 1
- B. cos θ+μ sin θ sin θ+μ cos θ cos θ + μ sin θ sin θ + μ cos θ
Answer: B. The key idea is that actual mechanical advantage is the load divided by the effort force. The effort is $mg\sin\theta+\mu mg\cos\theta$; therefore, $\mathrm{AMA}=\frac{mg}{mg(\sin\theta+\mu\cos\theta)}=\frac{1}{\sin\theta+\mu\cos\theta}$. Option A uses the wrong sine and cosine terms. Option C, $\cos\theta+\mu\sin\theta$, is not the reciprocal of the load-to-effort ratio. Option D gives the effort-to-load ratio, not the load-to-effort ratio. Textbook: Grade 9, unit 5 · section 5.6. - 6.A wheel and axle of radii 40 cm and 8 cm, respectively, is used to lift a bucket of 6 kg of water from a well by applying an effort of 20 N on the wheel. The percentage efficiency of this simple machine is
- A. 60%
- B. 66.7%
- C. 30%
- D. 80%
Answer, explanation and textbook page: open in the app. - 7.The magnetic field created by a long straight current carrying wire
- A. is directed in the same direction as the current.
- B. forms circular pattern around the wire.
- C. is directly proportional to the distance from the wire.
- D. is inversely proportional to the current in the wire.
Answer, explanation and textbook page: open in the app. - 8.What will happen on a pure semiconductor when it is doped by group III element?
- A. It becomes P-type semiconductor.
- B. It gets extra free electrons.
- C. It becomes intrinsic semiconductor.
- D. It becomes N-type semiconductor.
Answer, explanation and textbook page: open in the app. - 9.We usually use plastic materials to cover metallic wires that carry electricity to protect living things from danger. Which of the following statement correctly describes the nature of the plastic to use for this purpose?
- A. Since every electron in plastic is slightly bound to the parent atom, it becomes poor conductor.
- B. Since every electron in plastic is tightly bound to the parent atom, it becomes poor conductor.
- C. Since it has free electrons, it facilitates the easy flow of electric current in the metallic wires
- D. Since it has no free electrons, it directs the electrons in the wire to flow in the same direction.
Answer, explanation and textbook page: open in the app. - 10.Which one of the following statements is correct about the current-voltage (I–V) characteristics of a typical semiconductor diode?
- A. The region of the I-V curve that rises very rapidly after the voltage exceeds the cut-in voltage is the forward bias region.
- B. The region of the I-V curve that increases very rapidly after the bias voltage exceeds the breakdown voltage is in the forward bias region.
- C. The current due to the minority charge carriers is represented in the forward bias region of the I-V curve.
- D. The current due to the majority charge carriers is represented in the reverse bias region of the I-V curve.
Answer, explanation and textbook page: open in the app. - 11.R L Consider a circuit containing diode and load resistor are connected to an AC voltage source as shown in the figure below. If initially, polarity of 'a' is positive while 'b' is negative, Question Diagram
- A. During the second half-cycle, the diode is forward biased and current flows in the load resistor.
- B. During the first half-cycle, the diode is reverse biased and voltage is developed across the load resistor.
- C. During the first half-cycle, the diode is forward biased and voltage is developed across the load resistor.
- D. During the second half-cycle, the diode is reverse biased and no current flow in the load resistor.
Answer, explanation and textbook page: open in the app. - 12.A circular coil is located in a uniform magnetic field of magnitude $0.50\,\text{T}$ directed perpendicular to the plane of the coil. If the area of the coil changes with uniform rate, in such a way that it increases by $4.0\times10^{-3}\,\text{m}^2$ in $2\,\text{s}$, what is the magnitude of the induced electromotive force (emf) in the coil?
- A. $1.0\times10^3\,\text{V}$
- B. $2.5\times10^2\,\text{V}$
- C. $1.0\times10^{-3}\,\text{V}$
- D. $4.0\times10^{-3}\,\text{V}$
Answer, explanation and textbook page: open in the app. - 13.Vector quantities are represented by ______
- A. direction only.
- B. magnitude and direction.
- C. dimensionless values.
- D. magnitude only.
Answer, explanation and textbook page: open in the app. - 14.According to Newton's first law, an object that is in motion continues its state of motion with
- A. constant velocity if the resultant force exerted on it is not zero.
- B. a decreasing speed if the resultant force exerted on it is zero.
- C. constant velocity if the resultant force exerted on it is zero.
- D. an increasing speed if the resultant force exerted on it is not zero.
Answer, explanation and textbook page: open in the app. - 15.Which of the following correctly describes the difference between distance and displacement?
- A. Distance depends on the initial and final points, while displacement depends on the path followed by a moving body.
- B. Distance can be described both in magnitude and direction, while displacement is described only by magnitude.
- C. Distance has either positive or negative values, while displacement has only positive value.
- D. Distance is always greater than or equal to the magnitude of displacement, while the magnitude of the displacement is always less than or equal to distance.
Answer, explanation and textbook page: open in the app. - 16.Which of the following statements is correct about a uniformly accelerated motion?
- A. The acceleration is constant.
- B. The velocity is constant.
- C. The displacement increases at a uniform rate.
- D. The speed is constant but the direction is changing.
Answer, explanation and textbook page: open in the app. - 17.Two displacement vectors have magnitudes 4 m and 3 m. Which one of the following is NOT the possible value of the magnitude of their resultant vector?
- A. 7m
- B. 1m
- C. 12m
- D. 5m
Answer, explanation and textbook page: open in the app. - 18.A train is moving along a straight line with a constant acceleration of when it passes by a traffic light 30 m/s point. From there on, if the time taken by the train to reach a velocity of is 4 seconds, then what is the distance of the train from the traffic point after 8 seconds?
- A. 160 m
- B. 80m
- C. 320m
- D. 240m
Answer, explanation and textbook page: open in the app. - 19.Which one of the following statements is a necessary condition for an object to be in linear equilibrium?
- A. The linear acceleration of the object is non-zero constant.
- B. The linear speed of the object is constant.
- C. The linear acceleration of the object is zero.
- D. The net force acting on the object is non-zero constant.
Answer, explanation and textbook page: open in the app. - 20.When an object tends to slide over the surface of another object, tiny bumps at the surface of the two objects knocking and locking together. This causes
- A. frictional force.
- B. normal force.
- C. electrostatic force.
- D. gravitational force.
Answer, explanation and textbook page: open in the app. - 21.Suppose a ball is thrown vertically upward and after reaching a maximum height, it returns back to its initial position. Which of the following statement is correct about energy changes and work done on the ball?
- A. On its way down, change in its potential energy is positive.
- B. On its way down, work done by gravity is positive.
- C. On its way up, change in its kinetic energy is positive.
- D. On its way up, work done by gravity is positive.
Answer, explanation and textbook page: open in the app. - 22.The mechanical energy of an oscillating object at any point through its path is equal to
- A. the difference between its kinetic and potential energies.
- B. the sum of its potential and internal energies.
- C. the sum of its kinetic and internal energies.
- D. the sum of its kinetic and potential energies.
Answer, explanation and textbook page: open in the app. - 23.A 2 kg object accelerates with to the right on a horizontal frictionless surface under the action of two F 1 F 2 F 1 horizontal forces, and as shown in the figure below. What should be the magnitude of ? Question Diagram
- A. 4N
- B. 3N
- C. 1N
- D. 2N
Answer, explanation and textbook page: open in the app. - 24.A tennis ball of mass 0.10 kg traveling horizontally at 40.0 m/s is struck back by a racket. If the ball returns back with a speed of 30.0 m/s in the opposite direction, what is the magnitude of the impulse delivered to the ball by the racket?
- A. 1.0 kg m/s
- B. 7.0 kg m/s
- C. 4.0 kg m/s
- D. 3.0 kg m/s
Answer, explanation and textbook page: open in the app. - 25.The flow rate of a fluid is defined as
- A. the volume of the fluid crossing an area per unit time taken.
- B. the speed with which the fluid flowing through a pipe.
- C. the mass of the fluid crossing an area per unit time taken.
- D. the rate of change of the speed with which fluid flowing through a pipe.
Answer, explanation and textbook page: open in the app. - 26.At normal condition, solids are almost incompressible compared to liquids and gases. The reason is that
- A. their atoms are free to slide about and interact with neighbors.
- B. their atoms are relatively fixed distance apart and held together.
- C. their atoms vibrate and free to move.
- D. there is much space and little force between atoms.
Answer, explanation and textbook page: open in the app. - 27.Which of the following statements is correct about magnets?
- A. The north pole of one magnet repels the south pole of another magnet.
- B. Like electric charges, magnetic poles exist in a single isolated form.
- C. Unlike permanent magnets, electromagnets are magnets without poles.
- D. If you cut a bar magnet into two, each piece has both north and south poles.
Answer, explanation and textbook page: open in the app. - 28.A wheel of radius, $r = 50\text{cm}$, rotates about a fixed perpendicular axis that passes through its center. If the angular speed is $\omega = 200\frac{\text{rad}}{\text{s}}$, how much is the tangential speed of a point on the rim of the wheel?
- A. 10,000 m/s
- B. 800 m/s
- C. 80,000 m/s
- D. 100 m/s
Answer, explanation and textbook page: open in the app. - 29.Suppose your mass is measured to be 50 kg. If your friend having a mass of 55 kg is at a distance 2 m apart from you, what is the magnitude of gravitational force between you and your friend?
- A. $9.2\times10^{-8}\,\text{N}$
- B. $9.2\times10^{-11}\,\text{N}$
- C. $4.6\times10^{-9}\,\text{N}$
- D. $4.6\times10^{-11}\,\text{N}$
Answer, explanation and textbook page: open in the app. - 30.A $10\,\text{N}$ force is applied to the smaller circular piston of a hydraulic lift of radius $0.1\,\text{m}$ to lift a $2500\,\text{N}$ load placed on the larger piston. What is the area of the larger piston?
- A. $2.50\text{m}^2$
- B. $0.25\text{m}^2$
- C. $3.14\text{m}^2$
- D. $7.85\text{m}^2$
Answer, explanation and textbook page: open in the app. - 31.An electric field is defined as a region where
- A. a charged particle losses its charge when it is placed in that region.
- B. a charged particle experiences no electric force when it is placed in that region.
- C. a neutral particle experiences electric force when it is placed in that region.
- D. a charged particle experiences an electric force if it is placed in that region.
Answer, explanation and textbook page: open in the app. - 32.Which one of the following statements is correct about the speed of sound in different medium? The speed of sound
- A. in a colder and less dense medium is faster than in hotter and denser material.
- B. in solid is less than its speed in liquid.
- C. increases as the temperature and density of a material increases.
- D. in liquid is less than its speed in gas.
Answer, explanation and textbook page: open in the app. - 33.Four resistors are connected to a voltage source as shown in the figure below. Which one of the following is correct about the circuit? Question Diagram
- A. is connected in parallel with . R 2 R 3 R
- B. is connected in parallel with . 1 R 2 R 1 R 3 R 4 R 2 R 3 R 4
- C. is connected in series with the effective combination of and .
- D. is connected in parallel with the effective combination of and .
Answer, explanation and textbook page: open in the app. - 34.What is the magnitude of electric field strength at a distance of 2.0 m from a point charge, $Q = 4.0\mathrm{C}$?
- A. $9.0 \times 10^9\,\text{N/C}$
- B. $72.0 \times 10^9\,\text{N/C}$
- C. $54.0 \times 10^9\text{N/C}$
- D. $18.0 \times 10^9\text{N/C}$
Answer, explanation and textbook page: open in the app. - 35.A wire that has a resistance of 6Ω is drawn out so as to make it into a new wire two times as long as the original and half cross-sectional area of the original. What will be the resistance of the new wire?
- A. 12Ω
- B. 6Ω
- C. 3Ω
- D. 24Ω
Answer, explanation and textbook page: open in the app. - 36.If the critical angle for an optically denser medium to air boundary is $53^\circ$, what will be the refractive index of the medium? (Assume the index of refraction of air is 1.00. Given $\sin 53^\circ = 0.8$, $\cos 53^\circ = 0.6$)
- A. 1.67
- B. 1.33
- C. 1.00
- D. 1.25
Answer, explanation and textbook page: open in the app. - 37.An object moving in one dimension with constant acceleration travels through a displacement in a time interval . If its velocity at the initial time is and its velocity at a later time is , which of the following is a correct relation between the given quantities? at 2 1 2 s = a v −v f 2 i 2
- B. s = v t − f t ( 2 v −v f i ) at 2 1 s =
- D. s = v t + i
Answer, explanation and textbook page: open in the app. - 38.Which one of the following statements is correct about real and virtual images?
- A. Real images can be displayed on a screen unlike the virtual ones.
- B. Virtual images can be magnified but real images cannot.
- C. Virtual images can be displayed on a screen unlike the real ones.
- D. Real images can be magnified but virtual images cannot.
Answer, explanation and textbook page: open in the app. - 39.If two vectors and , with respective magnitudes of and , form an angle between them when they are a b a b α ab cos α connected tail to tail, then the expression defines the value of
- A. vector product of and .
- B. projection of on . a b a b
- C. resultant of and .
- D. scalar product of and . a b a b
Answer, explanation and textbook page: open in the app. - 40.A long straight wire carries a current of 5.0 A. What is the magnetic field strength produced by the current at a μ = 0 4π × 10 T\cdotpm/A −7 distance of 2.0 cm from the wire? (Magnetic permeability free space ) 5π × 10 T −5 20 × 10 T −5
- B. 20π × 10 T −5 5 × 10 T −5
Answer, explanation and textbook page: open in the app. - 41.Four point masses , , and are attached to a massless rod which y lays on the x-axis as shown in the figure below. How much is the moment of inertia of the system about the - axis? Question Diagram kg\cdotpm2 kg\cdotpm2
- A. 187
- B. 190 kg\cdotpm2 kg\cdotpm2
- C. 184
- D. 84
Answer, explanation and textbook page: open in the app. - 42.A projectile is thrown from a level ground with an initial velocity $\vec{v}_0$ making an angle of $\theta$ above the horizontal. If the maximum height covered by the projectile is $H$, then what is the horizontal range of the projectile in terms of $H$ and $\theta$?
- A. $\frac{H}{\tan\theta}$
- B. $\frac{H\tan\theta}{4}$
- C. $\frac{4H}{\tan\theta}$
- D. $\frac{H}{4\tan\theta}$
Answer, explanation and textbook page: open in the app. - 43.Assume that a ball is thrown horizontally from a building of height $h$ above the ground with initial speed $v_0$. Which one of the following statements is correct about the motion of the object?
- A. Its horizontal component acceleration is zero.
- B. Its vertical component velocity remains constant.
- C. Its vertical component acceleration is zero.
- D. Its horizontal component velocity uniformly increases.
Answer, explanation and textbook page: open in the app. - 44.Which one of the following phenomena occurs during change of phases of a matter? During a phase change from
- A. gas to liquid, heat energy is absorbed by a substance while its temperature remains constant.
- B. solid to liquid, heat energy is released from a substance while its temperature remains constant.
- C. liquid to solid, heat energy is released from a substance while its temperature changes uniformly.
- D. liquid to gas, heat energy is absorbed by a substance while its temperature remains constant.
Answer, explanation and textbook page: open in the app. - 45.Which one of the following defense technologies is correctly matched with its working principle?
- A. Missiles radiate electromagnetic signal and examine the echo received to identify the location of the target.
- B. A radar is a rocket propelled weapon designed to deliver an explosive weapon with a great accuracy at high speed.
- C. Infrared device uses heat emission to identify objects that cannot be detected using available light sources.
- D. Drones radiate electromagnetic signal and examine the echo received to identify the location of the target.
Answer, explanation and textbook page: open in the app. - 46.Which of the following concepts of physics are the primary focus points in mechanical engineering?
- A. Geometric optics, Electrostatics, Thermodynamics, and Stress
- B. Dynamics, Thermodynamics, Force, and Stress
- C. Nuclear physics, Geometric optics, Dynamics, and Force
- D. Molecular physics, Dynamics, Nuclear physics, and Force
Answer, explanation and textbook page: open in the app. - 47.Suppose that you are given two forces with in the direction of west of north and in the direction of east of north. If you add the two forces using analytical and graphical methods and represent using graphical scale of 1 cm for 10 N force, what are the possible length and direction of the arrow line for the resultant vector? 45∘
- A. 12.5 cm to the North
- B. 17.3 cm to North of East 45∘
- C. 1.25 cm to the North
- D. 1.73 cm to North of East
Answer, explanation and textbook page: open in the app. - 48.Given the displacement vector $\vec{A}=(3\hat{i}-4\hat{j})\,\text{m}$, what is the unit vector in the direction of $\vec{A}$?
- A. $-0.6\hat{i}+0.8\hat{j}$
- B. $0.6\hat{i}-0.8\hat{j}$
- C. $0.8\hat{i}-0.6\hat{j}$
- D. $0.6\hat{i}+0.8\hat{j}$
Answer, explanation and textbook page: open in the app. - 49.The amount of heat energy required to raise the temperature of a given substance by is
- A. quantity of heat.
- B. specific heat capacity.
- C. latent heat.
- D. heat capacity
Answer, explanation and textbook page: open in the app. - 50.Which one of the following statements is correct about the properties of waves?
- A. When two waves interfere destructively, the amplitude of the resultant wave is greater than the amplitude of each wave.
- B. Diffraction of a wave through a narrow gap is more observable than through a wider gap.
- C. When a wave is reflected, its speed and wavelength are changed.
- D. When a wave is refracted, its speed and wavelength remain the same.
Answer, explanation and textbook page: open in the app. - 51.A square metal plate of coefficient of linear expansion $\alpha$, has a surface area $A_0$ at a temperature $T_0$. If the temperature is raised by an amount $\Delta T$, then the plate surface area is changed to $A$ which is expressed as
- A. $A=A_0(1+2\alpha\Delta T)$
- B. $A=2A_0(1+\alpha\Delta T)$
- C. $A=A_0(1+\alpha\Delta T)$
- D. $A=A_0(1+3\alpha\Delta T)$
Answer, explanation and textbook page: open in the app. - 52.An object dropped into a sea sinks to a depth of 100 m. Which of the following is correct about the pressure the 1030kg/m3 object experiences? (Assume the density of seawater is and the air above the see exerts a P = atmospheric 1.00 × 10 Pa 5 g = 10m/s2 pressure of , ) = gauge 1.01 × 10 Pa 5 = absolute 9.30 × 10 Pa 5
- A. The gauge pressure exerted on it is
- B. The absolute pressure exerted on it is P P P = gauge 1.03 × 10 Pa 7
- C. The absolute pressure exerted on it is
- D. The gauge pressure exerted on it is P = absolute 1.13 × 10 Pa 6
Answer, explanation and textbook page: open in the app. - 53.The atmospheric pressure in a certain area is determined to be $103.36\,\text{kPa}$, using a mercury barometer shown in the figure below. (Acceleration due to gravity, $g = 10\,\text{m}/\text{s}^2$, and density of mercury, $\rho_m = 13.6 \times 10^3\,\text{kg}/\text{m}^3$) The height to which the mercury column rises is about
- A. 76 mm
- B. 76 cm
- C. 7.6 m
- D. 760 cm
Answer, explanation and textbook page: open in the app. - 54.How much heat energy is required to change 5 kg of ice at to water at ? (Specific heat capacities ∘ ∘ of water in liquid and solid phases are 4.2 kJ/kg C and 2.1 kJ/kg C, respectively, and latent heat of fusion of = f 336000J/kg L water, ) 4.20 × 10 J 5 1.68 × 10 J 6
- B. 2.10 × 10 J 6 1.89 × 10 J 6
Answer, explanation and textbook page: open in the app. - 55.Suppose a particle of mass $m$ is tied to a string and then whirled around in a horizontal circle of radius $r$ about the center O as shown in the figure below. If the string makes an angle of $\theta$ to the vertical while rotating, the component of the force that is responsible for the circular motion of the mass by providing the centripetal force is
- A. $T\sin\theta$
- B. $T\cos\theta$
- C. $mg\sin\theta$
- D. $mg\cos\theta$
Answer, explanation and textbook page: open in the app. - 56.Which one of the following statements is correct about the fundamental forces in nature and their applications?
- A. The force that keeps the nucleus of an atom from flying apart due to the repulsive force between protons is the weak nuclear force.
- B. The gravitational force makes planets to revolve around the Sun and to follow their orbital path.
- C. The force that arises in most radioactive processes and in nuclear reactions that generate the Sun's energy is the strong nuclear force.
- D. The electromagnetic force is the force that keeps protons and neutrons bound together in the nucleus of an atom.
Answer, explanation and textbook page: open in the app. - 57.A spring stores 120 J of elastic potential energy when it is stretched by 0.5 m. What is the potential energy stored by the spring when it is stretched by 1.5 m?
- A. 480 J
- B. 960 J
- C. 1080 J
- D. 540 J
Answer, explanation and textbook page: open in the app. - 58.The velocity-time graph of an object moving in a straight line is shown in the figure below. What is the magnitude of the total displacement covered by the object in the time interval of 14 seconds? Question Diagram
- A. 108 m
- B. 90 m
- C. 54 m
- D. 42 m
Answer, explanation and textbook page: open in the app. - 59.A crane at port is used to lift a 10,000 kg object to a height of 20 m. If the power developed by the crane is g = 10m/s2 50,000 W, how long does it take to lift the object? (Acceleration due to gravity, )
- A. 400 s
- B. 40 s
- C. 4 s
- D. 2 s
Answer, explanation and textbook page: open in the app. - 60.A system of four masses , , , and are located in the xy-plane at the coordinates of , , , and , respectively. What is the coordinate of the center of mass of the system?
- A. (20 cm, 3.75 cm)
- B. (−6.7cm, 5cm)
- D. (−5cm, 10cm) (−5cm, 3.75cm)
Answer, explanation and textbook page: open in the app.