Important Questions For You!
In ICSE Class 10, Physics is one of the most important subjects, as the fundamentals learnt also assist students to clear the competitive exams like IIT-JEE and NEET. TopperLearning provides ICSE Class 10 Physics students with robust study materials to help them to score well in the examination. Our study materials are created by subject experts and provide better insight on how to prepare for the ICSE Class 10 Physics examination.
hapter 1: Force
Q. 1.. A force is applied on [2M]
- a rigid body and
- non rigid body.
How does the effect of force differ in the two cases?
Q. 2. Explain the motion of a planet around the Sun in a circular path. [2M]
Q. 3. What are [3M]
- Centripetal forces
- Centrifugal forces?
Q. 4. State and explain the principle of moments. Draw a diagram to illustrate. [4M]
Q. 5. A ball is placed near the periphery of a merry-go-round and is tied to its centre. Merry-go-round is rotating about an axis passing through its centre. [4M]
- What will be your observation when you are standing outside the merry-go- round? Explain it.
- What will be your observation when you are standing at the centre of the merry-go-round? Explain it.
Chapter 2: Work, Energy and Power
Q. 1. A force is applied on a body of mass 20 kg moving with a velocity of 40 ms-1. The body attains a velocity of 50 ms-1 in 2 seconds. Calculate the work done by the body. [2M]
Q. 2. How is work done by a force measured when the force: [2M]
- is in the direction of displacement?
- is in an angle to the direction of displacement?
Q. 3. An engine can pump 30,000 litres of water to a vertical height of 45 metre in 10 minutes. Calculate the work done by the machine and the power.
(Density of water = 103 kg/m3, 1000 litre = 1 m3, g = 9.8ms-2) [3M]
Q. 4. An object 'P' of mass m is lifted from a point A on ground to point B at a height 'h' above the Earth by Rina and Mita, but the path taken for doing it is different by both as shown [3M]
- Calculate the work done in both the situations.
- In the above given cases, which force is doing positive work and which one is doing negative work?
Q. 5. [4M]
(i) State the energy in the following while in use:
- Burning of a candle.
- A steam engine.
(ii) On what basis would you classify an energy source as renewable? State two advantages and two limitations of the energy received from the Sun.
Chapter 3: Machines
Q. 1. A type of single pulley is very often used as a machine even though it does not give any mechanical advantage. [2M]
- Name the type of pulley used.
- For what purpose is such a pulley used?
Q. 2. Draw a simplified diagram of a lemon crusher, indicting of load and effort. [2M]
Q. 3. A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform 2.5 m above the ground. [3M]
- Calculate the mechanical advantage of the inclined plane.
- Calculate the effort applied by the coolie.
Q. 4. Derive a relationship between the mechanical advantage, the velocity ratio and the efficiency of a machine. [3M]
Q. 5. A block and tackle pulley system has a velocity ratio of 3. [4M]
- Draw a labelled diagram of this system. In your diagram, indicate clearly the points of application and the directions of the load and the effort.
- Why should the lower block of this pulley system be of negligible weight?
Chapter 4: Refraction of Light at Plane Surfaces
Q. 1. [2M]
- The refractive index of glass with respect to air is 1.5. What is the value of refractive index of air with respect to glass?
- A ray of light is incident as a normal ray on the surface of separation of two different mediums. What is the value of the angle of incidence in this case?
Q. 2. What are the necessary conditions for the total internal reflection? [2M]
Q. 3. [2M]
- Can the absolute refractive index of a medium be less than one?
- A coin placed at the bottom of a beaker appears to be raised by 4.0 cm. If the refractive index of water is 4/3, find the depth of the water in the beaker.
Q. 4. The refractive index of glass is 1.5. From a point P inside a glass block, draw rays PA, PB and PC incident on that glass-air surface at an angle of 30o, 42o and 60o respectively. [3M]
- In the diagram show the approximate direction of these rays as they emerge out of the block.
- What is the angle of refraction for the ray PB?
Q. 5. A ray of light of wavelength 5400Å suffers refraction from air to glass. Taking aμg = 1.5 , find the wavelength of light in glass.[3M]
Chapter 5: Refraction through a Lens
Q. 1. Riya claims to have obtained an image twice the size of the object with a concave lens. Is she correct? Give a reason for your answer. [2M]
Q. 2. A lens forms the image of an object placed at a distance 15 cm from it, at a distance 60 cm in front of it. Find: (i) the focal length, (ii) the magnification, and the nature of image. [2M]
Q. 3. A linear object is placed on the axis of a lens. An image is formed by refraction in the lens. For all positions of the object on the axis of the lens, the position of the image is always between the lens and the object. [3M]
- Name the lens.
- Draw a ray diagram to show the formation of the image of an object placed in front of the lens at any position of your choice except infinity.
Q. 4. An object AB is placed between 2F1 and F1 on the principal axis of the convex lens as shown in the diagram below: [4M]
Copy the diagram and using the rays starting from point A, obtain the image of the object formed by the lens.
Chapter 6: Spectrum
Q. 1. [2M]
- Name a prism required for obtaining a spectrum of Ultraviolet light.
- Name the radiations which can be detected by a thermopile.
Q. 2. Name the radiations: [3M]
- That are used for photography at night.
- That are used for detection of fracture in bones.
- Whose wavelength ranges from 100 Å to 4000 Å (or 10 nm to 400nm).
Q. 3. A type of electromagnetic wave has wavelength50Å [3M]
- Name the wave.
- What is the speed of the wave in vacuum?
- State one use of this type of wave.
Q. 4. A ray of white light is passed through a glass prism and spectrum is obtained on a screen. [3M]
- Name the seven colours of the spectrum in order.
- Do the colours have the same width in the spectrum?
- Which of the colour of the spectrum of white light deviates (i) the most? (ii) the least?
Q. 5. The diagram shown below shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. Now the yellow light is replaced by a narrow beam of white light incident at the same angle. Draw another diagram to show the passage of the beam through the prism and label it to show the effect of prism on the white light. [3M]
Chapter 7: Sound
Q. 1. [2M]
- State the safe limit of sound level in terms of decibel for human hearing.
- Name the characteristic of sound in relation to its wave form.
Q. 2. Radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3×108 ms-1. After how long is the signal received back from the aeroplane? [2M]
Q. 3. [3M]
- A man standing between two cliffs produces a sound and hears two successive echoes at intervals of 3 s and 4 s respectively. Calculate the distance between the two cliffs. The speed of sound in the air is 330ms-1.
- Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10m?
Q. 4. [4M]
- What is meant by the terms (a) amplitude and (b) frequency of a wave?
- Explain why stringed musical instruments, like the guitar, are provided with a hollow box.
Q. 5. In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set in to a mode of vibrations. [4 M]
- Name the type of vibrations taking place in pendulums B and D?
- What is the state of pendulum C?
- State the reason for the type of vibrations in pendulum B and C.
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