9478 + Interview Questions in Physics

1.	(a2+b2)(-a2+b2)=(b2+a2)(b2-a2) How?
Answer» (a²+b²)(-a²+b²)=(b²+a²)(b²-a²) How?

Discussion

2.	For which of the following, friction is responsible?
Answer» For which of the following, friction is responsible?

Discussion

3.	A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of the centre of buoyancy B with respect to the centre of gravity G of the block.
Answer» A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of the centre of buoyancy B with respect to the centre of gravity G of the block.

Discussion

4.	A periscope works on principle of
Answer» A periscope works on principle of

Discussion

5.	A charge 'Q' is moved through a potential difference 'V'. The work done in a circuit is W =
Answer» A charge 'Q' is moved through a potential difference 'V'. The work done in a circuit is $W$ =

Discussion

6.	What is the smallest planet in our solar system Mars or Venus
Answer» What is the smallest planet in our solar system Mars or Venus

Discussion

7.	Question 4 (d) An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms: muscular, contact, non-contact, gravity, friction, shape, attraction (d) While the arrow moves towards its target, the forces acting on it are due to ___ and that due to ___of air.
Answer» Question 4 (d) An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms: muscular, contact, non-contact, gravity, friction, shape, attraction (d) While the arrow moves towards its target, the forces acting on it are due to ___ and that due to ___of air.

Discussion

8.	(a) State two methods of producing sound. (b) How does sound from a sound producing body travel through air to reach our ears ?
Answer» (a) State two methods of producing sound. (b) How does sound from a sound producing body travel through air to reach our ears ?

8.

(a) State two methods of producing sound. (b) How does sound from a sound producing body travel through air to reach our ears ?

Answer»

(a) State two methods of producing sound.

(b) How does sound from a sound producing body travel through air to reach our ears ?

Discussion

9.	(a) Define frictional force (or friction) (b) Explain why frictional force is said to be a contact force. (c) Explain why magnetic force is said to be a non-contact force.
Answer» (a) Define frictional force (or friction) (b) Explain why frictional force is said to be a contact force. (c) Explain why magnetic force is said to be a non-contact force.

9.

(a) Define frictional force (or friction) (b) Explain why frictional force is said to be a contact force. (c) Explain why magnetic force is said to be a non-contact force.

Answer»

(a) Define frictional force (or friction)

(b) Explain why frictional force is said to be a contact force.

(c) Explain why magnetic force is said to be a non-contact force.

Discussion

10.	How will the faster vibration of source affect the pitch and frequency?
Answer» How will the faster vibration of source affect the pitch and frequency?

Discussion

11.	Why do we slip on a recently mopped floor?
Answer» Why do we slip on a recently mopped floor?

Discussion

12.	Is there only one way of increasing friction than only making the surface rough?
Answer» Is there only one way of increasing friction than only making the surface rough?

Discussion

13.	As the mountaineers climb higher altitudes there is the possibility of nasal bleeding.why?
Answer» As the mountaineers climb higher altitudes there is the possibility of nasal bleeding.why?

Discussion

14.	The Indian Space Research Organization (ISRO) has successfully test launched the Reusable Launch Vehicle-Technology Demonstrator (RLV-TD).Consider the following statements: Which of the above statement(s) is/are correct?
Answer» The Indian Space Research Organization (ISRO) has successfully test launched the Reusable Launch Vehicle-Technology Demonstrator (RLV-TD).Consider the following statements: Which of the above statement(s) is/are correct?

Discussion

15.	Why ship doesn't sink in water
Answer» Why ship doesn't sink in water

Discussion

16.	Why do you think it is necessary to define a separate quantity called pressure? Why is defining only force not enough?
Answer» Why do you think it is necessary to define a separate quantity called pressure? Why is defining only force not enough?

Discussion

17.	Will you be able to drink water in space using a straw? Why or why not
Answer» Will you be able to drink water in space using a straw? Why or why not

Discussion

18.	Liquid pressure is measured by
Answer» Liquid pressure is measured by

Discussion

19.	What is the relation between pressure exerted by liquids and its depth?
Answer» What is the relation between pressure exerted by liquids and its depth?

Discussion

20.	___ is the measure of the degree of hotness or coldness of a body.
Answer» ___ is the measure of the degree of hotness or coldness of a body.

Discussion

21.	Why does a plastic comb rubbed with dry hair attract bits of paper?
Answer» Why does a plastic comb rubbed with dry hair attract bits of paper?

Discussion

22.	A rod is pivoted at a point. A force of 20 N is applied at a distance of 20 cm from the pivot perpendicular to the rod as shown in the figure below. Calculate the moment of force about the pivot.
Answer» A rod is pivoted at a point. A force of $20 N$ is applied at a distance of $20 c m$ from the pivot perpendicular to the rod as shown in the figure below. Calculate the moment of force about the pivot.

Discussion

23.	Write true or false for each statement : (a) The temperature of a substance remains unaffected during its change of state. (b) Ice melts at 100∘C. (c) Water at 100∘C. has more heat than steam at 100∘C. (d) Evaporation of a liquid causes cooling. (e) Water evaporates only at 100∘C. (f) Boiling takes place over the entire mass of the liquid. (g) Evaporation takes place over the entire mass of the liqid. (h) The process of a gas converting directly into solid is called vaporization. (i) At high altitudes, water boils above 100∘C. (j) The melting point of ice is 0∘C
Answer» Write true or false for each statement : (a) The temperature of a substance remains unaffected during its change of state. (b) Ice melts at $100^{\circ} C .$ (c) Water at $100^{\circ} C .$ has more heat than steam at $100^{\circ} C .$ (d) Evaporation of a liquid causes cooling. (e) Water evaporates only at $100^{\circ} C .$ (f) Boiling takes place over the entire mass of the liquid. (g) Evaporation takes place over the entire mass of the liqid. (h) The process of a gas converting directly into solid is called vaporization. (i) At high altitudes, water boils above $100^{\circ} C .$ (j) The melting point of ice is $0^{\circ} C$

23.

Write true or false for each statement : (a) The temperature of a substance remains unaffected during its change of state. (b) Ice melts at 100∘C. (c) Water at 100∘C. has more heat than steam at 100∘C. (d) Evaporation of a liquid causes cooling. (e) Water evaporates only at 100∘C. (f) Boiling takes place over the entire mass of the liquid. (g) Evaporation takes place over the entire mass of the liqid. (h) The process of a gas converting directly into solid is called vaporization. (i) At high altitudes, water boils above 100∘C. (j) The melting point of ice is 0∘C

Answer»

Write true or false for each statement :

(a) The temperature of a substance remains unaffected during its change of state.

(b) Ice melts at $100^{\circ} C .$

(c) Water at $100^{\circ} C .$ has more heat than steam at $100^{\circ} C .$

(d) Evaporation of a liquid causes cooling.

(e) Water evaporates only at $100^{\circ} C .$

(f) Boiling takes place over the entire mass of the liquid.

(g) Evaporation takes place over the entire mass of the liqid.

(h) The process of a gas converting directly into solid is called vaporization.

(i) At high altitudes, water boils above $100^{\circ} C .$

(j) The melting point of ice is $0^{\circ} C$

Discussion

24.	can honey conduct electricity
Answer» can honey conduct electricity

Discussion

25.	Question 8 (ii) Fill in the blanks. (b) One of the most common applications of chemical effect of electric current is ___.
Answer» Question 8 (ii) Fill in the blanks. (b) One of the most common applications of chemical effect of electric current is ___.

Discussion

26.	A balloon inflates when the air is pumped into it. Which one of the following is the correct conclusion that can be derived out of this?
Answer» A balloon inflates when the air is pumped into it. Which one of the following is the correct conclusion that can be derived out of this?

Discussion

27.	Wear rubber shoes so that we don't get shocked. But in winter when we touch others they get a shock even if we are wearing rubber slippers. Why is it so?
Answer» Wear rubber shoes so that we don't get shocked. But in winter when we touch others they get a shock even if we are wearing rubber slippers. Why is it so?

Discussion

28.	How does a camera works and who invented it when and how?
Answer» How does a camera works and who invented it when and how?

Discussion

29.	A balloon filled with helium gas rises up. Give reason.
Answer» A balloon filled with helium gas rises up. Give reason.

Discussion

30.	If a meteor falls on the moon, will you be able to hear it's sound on Earth?
Answer» If a meteor falls on the moon, will you be able to hear it's sound on Earth?

Discussion

31.	Where do the magnetic lines of force originate from?
Answer» Where do the magnetic lines of force originate from?

Discussion

32.	A book placed on a desk is pushed onto the right, in which direction will the force of friction act?
Answer» A book placed on a desk is pushed onto the right, in which direction will the force of friction act?

Discussion

33.	A cannon ball of mass 2 kg is fired at a target 500 meters away. The 400 kg cannon recoils with a velocity of 2 m/s. Assuming that the cannon ball moves with a constant velocity, when will it hit the target?
Answer» A cannon ball of mass 2 kg is fired at a target 500 meters away. The 400 kg cannon recoils with a velocity of 2 m/s. Assuming that the cannon ball moves with a constant velocity, when will it hit the target?

Discussion

34.	Does light have any mass
Answer» Does light have any mass

Discussion

35.	Q) Copper conducts electricity through electrons whereas salts solution conducts electricity through ions. Do you agree? Could you please give me the answer for this.
Answer» Q) Copper conducts electricity through electrons whereas salts solution conducts electricity through ions. Do you agree? Could you please give me the answer for this.

35.

Q) Copper conducts electricity through electrons whereas salts solution conducts electricity through ions. Do you agree? Could you please give me the answer for this.

Answer»

Q) Copper conducts electricity through electrons whereas salts solution conducts electricity through ions. Do you agree?

Could you please give me the answer for this.

Discussion

36.	Four blocks of the same material, m1, m2, m3 and m4 have masses 2 kg, 4 kg, 2.5 kg and 2 kg respectively. All of them have equal surface area in contact with the concrete surface over which they are kept. Let the frictional force acting on them be F1, F2, F3 and F4 respectively. The correct order of friction force acting on them when they slide is:
Answer» Four blocks of the same material, $m_{1}, m_{2}, m_{3}$ and $m_{4}$ have masses $2 k g, 4 k g, 2.5 k g$ and $2 k g$ respectively. All of them have equal surface area in contact with the concrete surface over which they are kept. Let the frictional force acting on them be $F_{1}, F_{2}, F_{3}$ and $F_{4}$ respectively. The correct order of friction force acting on them when they slide is:

Discussion

37.	Which of these substances help us to reduce friction between the surfaces?
Answer» Which of these substances help us to reduce friction between the surfaces?

Discussion

38.	How to find out Noor images in multiple reflection?
Answer» How to find out Noor images in multiple reflection?

Discussion

39.	The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 10 cm more distant from the mirror than the object. The magnification of the image is?
Answer» The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 10 cm more distant from the mirror than the object. The magnification of the image is?

Discussion

40.	The given figure shows an arrangement of single moving pulleys. If the effort applied at the free end of the string is E; calculate the mechanical advantage of the system of pulleys.
Answer» The given figure shows an arrangement of single moving pulleys. If the effort applied at the free end of the string is E; calculate the mechanical advantage of the system of pulleys.

40.

The given figure shows an arrangement of single moving pulleys. If the effort applied at the free end of the string is E; calculate the mechanical advantage of the system of pulleys.

Answer»

The given figure shows an arrangement of single moving pulleys.

If the effort applied at the free end of the string is E; calculate the mechanical advantage of the system of pulleys.

Discussion

41.	Diveregence increases when a positively charged body is brought near a positively charged gold leaf electroscope. Give reason.
Answer» Diveregence increases when a positively charged body is brought near a positively charged gold leaf electroscope. Give reason.

Discussion

42.	Two blocks of unequal masses are tied by a spring. The blocks are pulled stretching the spring slightly and the system is released on a frictionless horizontal platform. Are the forces due to the spring on the two blocks equal and opposite? Is it an example of Newton's third law?
Answer» Two blocks of unequal masses are tied by a spring. The blocks are pulled stretching the spring slightly and the system is released on a frictionless horizontal platform. Are the forces due to the spring on the two blocks equal and opposite? Is it an example of Newton's third law?

Discussion

43.	Why do we not fall when Earth rotates ?
Answer» Why do we not fall when Earth rotates ?

Discussion

44.	When the south pole of a magnet is brought near the north pole of a freely suspended magnetic needle, it will_____.
Answer» When the south pole of a magnet is brought near the north pole of a freely suspended magnetic needle, it will_____.

Discussion

45.	Draw a ray diagram to show the formation of image of an object placed on the principal axis of a convex mirror. State the position, size and nature of the image. What happens to the image as the object is moved away from the mirror ?
Answer» Draw a ray diagram to show the formation of image of an object placed on the principal axis of a convex mirror. State the position, size and nature of the image. What happens to the image as the object is moved away from the mirror ?

Discussion

46.	An inflated balloon is placed in a a jar, which is connected to an evacuating pump. What happens if the air inside the jar is pumped out? Explain.
Answer» An inflated balloon is placed in a a jar, which is connected to an evacuating pump. What happens if the air inside the jar is pumped out? Explain.

Discussion

47.	___________ is generally seen in summer whereas ___________ is generally seen in winters.
Answer» ___________ is generally seen in summer whereas ___________ is generally seen in winters.

Discussion

48.	Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns. Column AColumn BPitchWaveformQualityFrequencyLoudnessIntensity
Answer» Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns. $\begin{matrix} Column A & Column B Pitch & Waveform Quality & Frequency Loudness & Intensity \end{matrix}$

Discussion

49.	Your parents want to join you in a school. One school is near the airport and along the road having heavy traffic. Another school is much away both from airport and traffic, in a serene place with more trees around.If parents gives you the choice of joining in either of the school, which school would you join and why? [3 MARKS]
Answer» Your parents want to join you in a school. One school is near the airport and along the road having heavy traffic. Another school is much away both from airport and traffic, in a serene place with more trees around.If parents gives you the choice of joining in either of the school, which school would you join and why? [3 MARKS]

Discussion

50.	In which medium sound travels faster?
Answer» In which medium sound travels faster?

50.

In which medium sound travels faster?

Answer»

In which medium sound travels faster?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

(a2+b2)(-a2+b2)=(b2+a2)(b2-a2) How?

For which of the following, friction is responsible?

A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of the centre of buoyancy B with respect to the centre of gravity G of the block.

A periscope works on principle of

A charge 'Q' is moved through a potential difference 'V'. The work done in a circuit is W =

What is the smallest planet in our solar system Mars or Venus

(a) State two methods of producing sound. (b) How does sound from a sound producing body travel through air to reach our ears ?

(a) Define frictional force (or friction) (b) Explain why frictional force is said to be a contact force. (c) Explain why magnetic force is said to be a non-contact force.

How will the faster vibration of source affect the pitch and frequency?

Why do we slip on a recently mopped floor?

Is there only one way of increasing friction than only making the surface rough?

As the mountaineers climb higher altitudes there is the possibility of nasal bleeding.why?

The Indian Space Research Organization (ISRO) has successfully test launched the Reusable Launch Vehicle-Technology Demonstrator (RLV-TD).Consider the following statements: Which of the above statement(s) is/are correct?

Why ship doesn't sink in water

Why do you think it is necessary to define a separate quantity called pressure? Why is defining only force not enough?

Will you be able to drink water in space using a straw? Why or why not

Liquid pressure is measured by

What is the relation between pressure exerted by liquids and its depth?

___ is the measure of the degree of hotness or coldness of a body.

Why does a plastic comb rubbed with dry hair attract bits of paper?

A rod is pivoted at a point. A force of 20 N is applied at a distance of 20 cm from the pivot perpendicular to the rod as shown in the figure below. Calculate the moment of force about the pivot.

can honey conduct electricity

Question 8 (ii) Fill in the blanks. (b) One of the most common applications of chemical effect of electric current is ___.

A balloon inflates when the air is pumped into it. Which one of the following is the correct conclusion that can be derived out of this?

Wear rubber shoes so that we don't get shocked. But in winter when we touch others they get a shock even if we are wearing rubber slippers. Why is it so?

How does a camera works and who invented it when and how?

A balloon filled with helium gas rises up. Give reason.

If a meteor falls on the moon, will you be able to hear it's sound on Earth?

Where do the magnetic lines of force originate from?

A book placed on a desk is pushed onto the right, in which direction will the force of friction act?

A cannon ball of mass 2 kg is fired at a target 500 meters away. The 400 kg cannon recoils with a velocity of 2 m/s. Assuming that the cannon ball moves with a constant velocity, when will it hit the target?

Does light have any mass

Q) Copper conducts electricity through electrons whereas salts solution conducts electricity through ions. Do you agree? Could you please give me the answer for this.

Which of these substances help us to reduce friction between the surfaces?

How to find out Noor images in multiple reflection?

The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 10 cm more distant from the mirror than the object. The magnification of the image is?

The given figure shows an arrangement of single moving pulleys. If the effort applied at the free end of the string is E; calculate the mechanical advantage of the system of pulleys.

Diveregence increases when a positively charged body is brought near a positively charged gold leaf electroscope. Give reason.

Two blocks of unequal masses are tied by a spring. The blocks are pulled stretching the spring slightly and the system is released on a frictionless horizontal platform. Are the forces due to the spring on the two blocks equal and opposite? Is it an example of Newton's third law?

Why do we not fall when Earth rotates ?

When the south pole of a magnet is brought near the north pole of a freely suspended magnetic needle, it will_____.

Draw a ray diagram to show the formation of image of an object placed on the principal axis of a convex mirror. State the position, size and nature of the image. What happens to the image as the object is moved away from the mirror ?

An inflated balloon is placed in a a jar, which is connected to an evacuating pump. What happens if the air inside the jar is pumped out? Explain.

___________ is generally seen in summer whereas ___________ is generally seen in winters.

Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns. Column AColumn BPitchWaveformQualityFrequencyLoudnessIntensity

In which medium sound travels faster?

_ is generally seen in summer whereas _ is generally seen in winters.