Conceptual Questions | Class 10 Physics Notes

CHAPTER 1-SIMPLE HARMONIC MOTION AND WAVES

1.1. If the length of a simple pendulum is doubled, what will be the change in its time period?

1.2. A ball is dropped from a certain height onto the floor and keeps bouncing. Is the motion of the ball simple harmonic? Explain.

1.3. A student performed two experiments with a simple pendulum. He/She used two bobs of different masses by keeping other parameters constant. To his/her astonishment the time period of the pendulum did not change! Why?

1.4. What types of waves do not require any material medium for their propagation?

1.5. Plane waves in the ripple tank undergo refraction when they move from deep to shallow water. What change occurs in the speed of the waves?

CHAPTER 2-SOUND

2.1 Why two tin cans with a string stretched between them could be better way to communicate than merely shouting through the air?

2.2 We can recognize persons speaking with the same loudness from their voice. How is this possible?

2.3 You can listen to your friend round a corner, but you cannot watch him/her. Why?

2.4 Why must the volume of a stereo in a room with wall-to-wall carpet be tuned higher than in a room with a wooden floor?

2.5 A student says that the two terms speed and frequency of the wave refer to the same thing. What is your response?

2.6 Two people are listening to the same music at the same distance. They disagree on its loudness. Explain how this could happen.

2.7 Is there any difference between echo and reflection of sound? Explain.

2.8 Will two separate 50dB sounds together constitute a 100dB sound? Explain.

2.9 Why ultrasound is useful in medical field?

CHAPTER 3-GEOMETRIC OPTICS

3.1. A man raises his left hand in a plane mirror, the image facing him is raising his right hand. Explain why.

3.2. In your own words, explain why light waves are refracted at a boundary between two materials.

3.3. Explain why a fish under water appears to be at a different depth below the surface than it actually is. Does it appear deeper or shallower?

3.4. Why or why not concave mirrors are suitable for makeup?

3.5. Why is the driver’s side mirror in many cars convex rather than plane or concave?

3.6. When an optician’s testing room is small, he uses a mirror to help him test the eyesight of his patients. Explain why.

3.7. How does the thickness of a lens affect its focal length?

3.8. Under what conditions will a converging lens form a virtual image?

3.9. Under what conditions will a converging lens form a real image that is the same size as the object?

3.10. Why do we use refracting telescope with large objective lens of large focal length?

CHAPTER 4-ELECTROSTATICS

4.1. An electrified rod attracts pieces of paper. After a while these pieces fly away! Why?

4.2. How much negative charge has been removed from a positively charged electroscope, if it has a charge of 7.5 × 1-2 C?

4.3. In what direction will a positively charged particle move in an electric field?

4.4. Does each capacitor carry equal charge in series combination? Explain.

4.5. Each capacitor in parallel combination has equal potential difference between its two plates. Justify the statement.

4.6. Perhaps you have seen a gasoline truck trailing a metal chain beneath it. What purpose does the chain serve?

4.7. If a high-voltage power line fell across your car while you were in the car, why should you not come out of the car?

4.8. Explain why, a glass rod can be charged by rubbing when held by hand but an iron rod cannot be charged by rubbing, if held by hand?

4.9.Rubber tires get charged from friction with the road. What is the polarity of the charge?

CHAPTER 5-CURRENT ELECTRICITY

5.1 Why in conductors charge is transferred by free electrons rather than by positive charges?

5.2 What is the difference between a cell and a battery?

5.3 Can current flow in a circuit without potential difference?

5.4 Two points on an object are at different electric potentials. Does charge necessarily flow between them?

5.5 In order to measure current in a circuit why ammeter is always connected in series?

5.6 In order to measure voltage in a circuit voltmeter is always connected in parallel. Discuss.

5.7 How many watt-hours are there in 1000 joules?

5.8 From your experience in watching cars on the roads at night, are automobile headlamps connected in series or in parallel?

5.9 A certain flash-light can use a 1 ohm bulb or a 5 ohm bulb. Which bulb should be used to get the brighter light? Which bulb will discharge the battery first?

5.10 It is impracticable to connect an electric bulb and an electric heater in series. Why?

5.11 Does a fuse in a circuit control the potential difference or the current?

5.12 Is the presence of charge necessary for the existence of electrostatic potential?

CHAPTER 6-ELECTROMAGNETISM

6 .1 Suppose someone handed you three similar iron bars and told you one was not magnet but the other two were. How would you find the iron bar that was not magnet?

6 .2 Suppose you have a coil of wire and a bar magnet. Describe how you could use them to generate an electric current.

6 .3 Which device is used for converting electrical energy into mechanical energy?

6 .4 Suppose we hang a loop of wire so that it can swing easily. If we now put a magnet into the coil, the coil will start swinging. Which way will it swing relative to the magnet and why?

6 .5 A conductor wire generates a voltage while moving through a magnetic field. In what direction should the wire be moved, relative to the field to generate the maximum voltage?

6 .6 What is the difference between a generator and a motor?

6 .7 What reverses the direction of electric current in the armature coil of D.C. motor?

6 .8 A wire lying perpendicular to an external magnetic field carries a current in the direction shown in the diagram below. In what direction will the wire move due to the resulting magnetic force?

6.9 Can a transformer operate on direct current?

CHAPTER 7-BASIC ELECTRONICS

7.1 Name two factors which can enhance thermionic emission.

7.2 Give three reasons to support the evidence that cathode rays are negatively charged electrons.

7.3 When electrons pass through two parallel plates having opposite charges they are deflected towards the positively charged plate.What important characteristic of the electron can be inferred from this?

7.4 When a moving electron enters the magnetic field, it is deflected from its straight path. Name two factors which can enhance electron deflection.

7.5 How can you compare the logic operation X=A.B with usual operation of multiplication.

7.6 NAND gate is the reciprocal of AND gate. Discuss

CHAPTER 8-INFORMATION AND COMMUNICATION TECHNOLOGY

8.1. Why optical fibre is more useful tool for the communication process?

8.2. Which is more reliable floppy disk or a hard disk?

8.3. What is the difference between RAM and ROM memories?

CHAPTER 9-ATOMIC AND NUCLEAR PHYSICS

9.1. Is it possible for an element to have different types of atoms? Explain.

9.2. What nuclear reaction would release more energy, the fission reaction or the fusion reaction? Explain.

9.3. Which has more penetrating power, alpha particle or gamma ray photon?

9.4. What is the difference between natural and artificial radioactivity?

9.5. How long would you likely have to wait to watch any sample of radioactive atoms completely decay?

9.6. Which type of natural radioactivity leaves the number of protons and the number of neutrons in the nucleus unchanged?

9.7. How much of a 1g sample of pure radioactive matter would be left undecayed after four half-lives?

9.8. Tritium 13H is radioactive isotope of hydrogen. It decays by emitting an electron. What is the daughter nucleus?

9.9. What information about the structure of the nitrogen atom can be obtained from its nuclide 714N ? In what way atom in 714N is different from the atom in 716N.

Conceptual Questions | Class 10 Physics Notes

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