ICSE Class 10 Physics 2022 Semester-1 Sample Paper
Question 1
(a) Choose the correct statement with respect to Refraction of light
- The frequency always changes when light enters from one optical medium to another.
- Absorption of light when it strikes the surface of a medium is refraction.
- Speed of light changes when it enters from one optical medium to another of different optical density.
- Speed of light does not change when it enters from one optical medium to another of different optical density.
(b) When a light ray enters from a denser medium to a rarer medium
- The light ray bends towards the normal.
- Angle of incidence is less than angle of refraction.
- Speed of light decreases.
- Speed of light remains unchanged.
(c) In the diagram shown below:
- B is incident ray and C is refracted ray.
- A is incident ray and B is refracted ray.
- C is incident ray and B is refracted ray.
- A is incident ray and C is refracted ray.
(d) From the diagram shown below, identify the characteristics of the image that will be formed.
- Real.
- Diminished.
- Formed within the focal length.
- Virtual.
(e) The wavelength of light in a medium A is 600 nm. The wave enters medium B of refractive index 1.5 with respect to medium A.
(i) Select the correct option from the following.
- the wavelength of light becomes 1.5 times the initial wavelength.
- the wavelength of light decreases.
- the wavelength becomes half of initial wavelength.
- the wave bends away from the normal.
(ii) The wavelength in medium B will be
- 400 nm
- 900 nm
- 300 nm
- Information is insufficient to calculate.
(f) The diagram below shows an image formed at a distance 36 cm from the lens LL’ of focal length 12 cm. With respect to this answer the questions that follow.
(i) The position of the object on the left-hand side should be
- between 12 cm to 30 cm from the lens.
- beyond 24 cm from the lens.
- between 12 cm to 24 cm from the lens.
- within 12 cm from the lens.
(ii) Power of this lens is
- - 8.33 D
- + 8.4 D
- + 8.33 D
- - 8.4 D
(iii) The object distance with sign convention is
- - 18 cm
- - 15 cm
- - 9 cm
- + 18 cm
(iv) If the lens LL’ is replaced by another lens of same type but focal length 15 cm then for the same object distance
- the size of the image decreases.
- the size of the image increases.
- the size of the image remains the same.
- information is insufficient to conclude.
Question 2
(a) The usable form of mechanical energy is
- Elastic potential energy
- Kinetic energy
- Gravitational potential energy
- None of the given options
(b) One horsepower is equal to
- 100 W
- 735 W
- 764 W
- 746 W
(c) If A and B of the same mass can climb the third floor of the same building in 3 minutes and 5 minutes respectively, then the ratio of their powers of A is to B in an ideal situation is
- 1:1
- 3:5
- The information is insufficient to form a conclusion.
- 5:3
(d) If the centre of gravity of a metre scale of mass 80 g lies at the 45 cm mark, then which one of the following diagrams will show the balanced position of the scale.
(e) A body has kinetic energy 2500 J. If the mass of the body is 500 g.
(i) The velocity of the body is
- √10 m/s
- 10 m/s
- 20 m/s
- 100 m/s
(ii) The momentum of the body will be
- 10 kg ms-1
- 500√10 kg ms-1
- 50 kg ms-1
- 5 kg ms-1
(f) A girl at rest at gate of her society which is 3.2 m above the road comes down the slope AB on a cycle without paddling. [g = 10 N/kg]
(i) The mechanical energy possessed by the girl at B is
- Vibrational kinetic energy.
- Translational kinetic energy
- Elastic potential energy.
- Gravitational potential energy.
(ii) The velocity with which girl reaches point A is
- 32 m/s
- 10 m/s
- 8 m/s
- Insufficient information to calculate velocity.
(iii) If the mass of the girl is 40 kg then the kinetic energy of the girl at A is [Assuming no loss of energy.]
- 1280 J
- 1600 J
- 400 J
- 3200 J
(iv) The potential energy of the girl (of mass 40 kg) when she reaches the midpoint of the slope of AB
- 800 J
- 200 J
- 1600 J
- 640 J
Question 3
(a) Mechanical advantage (M.A.), load (L), and effort (E) are related as
- M.A. = L x E
- M.A. = E/L
- M.A. x E = L
- M.A. x L = E
(b) Which one of the following statements is correct?
- A machine is used to have more output energy as compared to input energy.
- Mechanical advantage of a machine can never be greater than 1.
- If a machine gives convenience of direction, then its mechanical advantage should be greater than 1.
- For a given design of a machine, even if the mechanical advantage increases, the velocity ratio remains the same.
(c) If a block and tackle system with convenient direction has 3 movable pulleys, then its velocity ratio
- is either 6 or 7
- should be 6
- should be 7
- is 3
(d) Work done by a body moving on a circular track is zero at every instant because
- displacement is zero.
- displacement is perpendicular to the centripetal force.
- there is no force acting.
- reason is not mentioned in the other options.
(e) Identify the conditions required to hear a clear and distinct echo by humans, in air
- The reflecting surface should be rough.
- The size of the reflecting surface should be smaller than the wavelength of sound.
- Sound should not be reflected back within 0.1 s.
- The incident sound should have frequency more than 25000 Hz.
- The size of the reflecting surface should be larger than the wavelength of sound.
(f) A person standing in front of a vertical cliff fires a gun and hears its echo in 3s. The speed of sound in air is 340 m/s.
(i) The distance at which the person is standing in front of the cliff is
- 1020 m
- 510 m
- 340 m
- 680 m
(ii) If the person wants to hear the echo 0.5 s earlier, then how much distance should he move, toward or away from the cliff?
- 595 m away from the cliff
- 255 m towards the cliff
- 85 m towards the cliff
- 255 m away from the cliff
(iii) Another person stands behind this person, in the same line with him and the cliff, at a distance of 170 m and fires a gun in the air. What are the consecutive intervals of time at which the first person hears two sounds?
- 0.5 s and 3 s
- 1 s and 3 s
- 1 s and 4 s
- 0.5 s and 3.5 s
(iv) If the speed of sound changes to 350 m/s then how much distance should the person move towards or away from the cliff, in order to hear the echo in the same time? (i.e. in 3 s)?
- 25 m away
- 7.5 m away
- 20 m away
- 15 m away
Question 4
(a) Assuming all lenses shown below are of the same material, state which lens has the maximum power.
- R
- P
- Q
- S
(b) In an electric cell while in use, the change in energy is from:
- Chemical to mechanical
- Chemical to electrical
- Electrical to mechanical
- Electrical to chemical
(c) The diagram below shows a pendulum having a bob of mass 80 g. A and C are extreme positions and B is the mean position. The bob has velocity 5 m/s at position B. [g = 10N/kg]
(i) Which one of the following statements is correct?
- At point A the bob has only kinetic energy.
- At point B the bob will have only potential energy.
- At point B the bob will have maximum kinetic energy.
- At point D the bob will have more potential and less kinetic energy.
(ii) The height h is
- 1.25 cm
- 125 m
- 1.25 m
- 0.125 m
(d) (i) Select correct options for Total internal reflection in a medium.
- Can take place in an optically denser medium as compared to an optically rarer medium.
- Takes place for any angle of incidence greater than 42 degree.
- This reflection does not obey the laws of reflection.
- Can take place if the angle of incidence in a denser medium is less than the critical angle.
(ii) Diamonds glitter in the dark because
- They emit light.
- They have a very small critical angle due to very high refractive index.
- Due to the fluorescence.
- Chemical reaction in the diamond produces light energy.
(e) The diagram shows the path of light through a right-angled prism of critical angle 42°.
Observe the diagram and answer the questions that follow.
(i) The phenomenon at the surface AC is
- Refraction
- Partial reflection
- Total internal reflection
- Scattering
(ii) The angle of incidence at the surface AC is
- 30°
- 45°
- 60°
- 90°
(iii) The angle of incidence at the surface AB is
- 30°
- 45°
- 60°
- 90°
(iv) Which of the following statement is wrong?
- Speed of light ray PQ is equal to the speed of light ray ST.
- Speed of light ray QR is equal to the speed of light ray RS.
- Speed of light ray PQ is greater than the speed of light ray RS.
- Speed of light ray RQ is greater than the speed of light ray ST.