9478 + Interview Questions in Physics Page 142 InterviewSolution

7051.	A puppy, trapped by a current carrying wire, was barking for help. A man passing by used a wooden stick to save it. Why did he prefer wooden stick and not his hands?
Answer» A puppy, trapped by a current carrying wire, was barking for help. A man passing by used a wooden stick to save it. Why did he prefer wooden stick and not his hands?

Discussion

7052.	What is a force? How can you test for sure if a force is acting or not? [2 MARKS]
Answer» What is a force? How can you test for sure if a force is acting or not? [2 MARKS]

Discussion

7053.	Mathematically, velocity is related with displacement as speed is related with?
Answer» Mathematically, velocity is related with displacement as speed is related with?

Discussion

7054.	Is current constituted by protons? If so then how come we say that current moves in the opposite direction to the direction of electrons when protons do no move from their position?
Answer» Is current constituted by protons? If so then how come we say that current moves in the opposite direction to the direction of electrons when protons do no move from their position?

Discussion

7055.	Describe a simple experiment to show that at a given depth, a liquid exerts same pressure in all directions.
Answer» Describe a simple experiment to show that at a given depth, a liquid exerts same pressure in all directions.

Discussion

7056.	Why wood absorbs sound?
Answer» Why wood absorbs sound?

Discussion

7057.	The frequencies of notes given by flute, guitar and trumpet are respectively 400 Hz, 200 Hz and 500 Hz. Which one of these has the highest pitch ?
Answer» The frequencies of notes given by flute, guitar and trumpet are respectively 400 Hz, 200 Hz and 500 Hz. Which one of these has the highest pitch ?

Discussion

7058.	A body is moving in a constant state of motion on rolling on ground A)Friction is acting in the same direction B)Friction is absent C)Friction is greater D)All of these
Answer» A body is moving in a constant state of motion on rolling on ground A)Friction is acting in the same direction B)Friction is absent C)Friction is greater D)All of these

Discussion

7059.	Question 17.1 Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21).
Answer» Question 17.1 Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21).

Discussion

7060.	Question 1 (c) Fill in the blank. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.
Answer» Question 1 (c) Fill in the blank. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.

7060.

Question 1 (c) Fill in the blank. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.

Answer»

Question 1 (c)
Fill in the blank.

If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.

Discussion

7061.	Light changes its path as the medium changes during the transit. This is because of
Answer» Light changes its path as the medium changes during the transit. This is because of

Discussion

7062.	Select the correct alternative: (a) All wires used in electric circuits should be covered with: (i) colouring material (ii) conducting material (iii) an insulting material (iv) none of the above. (b) Electrical work done per unit time is: (i) electrical energy (ii) electric current (iii) electric voltage (iv) electric power (c) One kilowatt is equal to : (i) 100 watt (ii) 1000 watt (iii) 10 watt (iv) none of the these. (d) Fuse wire is an alloy of : (i) tin-lead (ii) copper-lead (iii) tin-copper (iv) lead-silver (e) A fuse wire should have : (i) a low melting point (ii) high melting point (iii) very high melting point (iv) none of the above. (f) When the switch of an electric appliance is put off, it disconnects: (i) the live wire (ii) the neutral wire (iii) the earth wire (iv) the live and the neutral wires. (g) The purpose of an electric meter in a house is : (i) to give the cost of electricity directly (ii) to give the consumption of electrical energy (iii) to safeguard the circuit from short circuiting (iv) to put on or off the mains. (h) If out of the two lighted bulbs in a room, one bulb suddenly fuses, then: (i) other bulb will glow more (ii) other bulb will glow less (iii) other bulb will also fuse (iv) other bulb will remain lighted unaffected.
Answer» Select the correct alternative: (a) All wires used in electric circuits should be covered with: (i) colouring material (ii) conducting material (iii) an insulting material (iv) none of the above. (b) Electrical work done per unit time is: (i) electrical energy (ii) electric current (iii) electric voltage (iv) electric power (c) One kilowatt is equal to : (i) 100 watt (ii) 1000 watt (iii) 10 watt (iv) none of the these. (d) Fuse wire is an alloy of : (i) tin-lead (ii) copper-lead (iii) tin-copper (iv) lead-silver (e) A fuse wire should have : (i) a low melting point (ii) high melting point (iii) very high melting point (iv) none of the above. (f) When the switch of an electric appliance is put off, it disconnects: (i) the live wire (ii) the neutral wire (iii) the earth wire (iv) the live and the neutral wires. (g) The purpose of an electric meter in a house is : (i) to give the cost of electricity directly (ii) to give the consumption of electrical energy (iii) to safeguard the circuit from short circuiting (iv) to put on or off the mains. (h) If out of the two lighted bulbs in a room, one bulb suddenly fuses, then: (i) other bulb will glow more (ii) other bulb will glow less (iii) other bulb will also fuse (iv) other bulb will remain lighted unaffected.

7062.

Select the correct alternative: (a) All wires used in electric circuits should be covered with: (i) colouring material (ii) conducting material (iii) an insulting material (iv) none of the above. (b) Electrical work done per unit time is: (i) electrical energy (ii) electric current (iii) electric voltage (iv) electric power (c) One kilowatt is equal to : (i) 100 watt (ii) 1000 watt (iii) 10 watt (iv) none of the these. (d) Fuse wire is an alloy of : (i) tin-lead (ii) copper-lead (iii) tin-copper (iv) lead-silver (e) A fuse wire should have : (i) a low melting point (ii) high melting point (iii) very high melting point (iv) none of the above. (f) When the switch of an electric appliance is put off, it disconnects: (i) the live wire (ii) the neutral wire (iii) the earth wire (iv) the live and the neutral wires. (g) The purpose of an electric meter in a house is : (i) to give the cost of electricity directly (ii) to give the consumption of electrical energy (iii) to safeguard the circuit from short circuiting (iv) to put on or off the mains. (h) If out of the two lighted bulbs in a room, one bulb suddenly fuses, then: (i) other bulb will glow more (ii) other bulb will glow less (iii) other bulb will also fuse (iv) other bulb will remain lighted unaffected.

Answer»

Select the correct alternative:

(a) All wires used in electric circuits should be covered with:

(i) colouring material

(ii) conducting material

(iii) an insulting material

(iv) none of the above.

(b) Electrical work done per unit time is:

(i) electrical energy

(ii) electric current

(iii) electric voltage

(iv) electric power

(c) One kilowatt is equal to :

(i) 100 watt (ii) 1000 watt

(iii) 10 watt (iv) none of the these.

(d) Fuse wire is an alloy of :

(i) tin-lead (ii) copper-lead

(iii) tin-copper (iv) lead-silver

(e) A fuse wire should have :

(i) a low melting point

(ii) high melting point

(iii) very high melting point

(iv) none of the above.

(f) When the switch of an electric appliance is put off, it disconnects:

(i) the live wire

(ii) the neutral wire

(iii) the earth wire

(iv) the live and the neutral wires.

(g) The purpose of an electric meter in a house is :

(i) to give the cost of electricity directly

(ii) to give the consumption of electrical energy

(iii) to safeguard the circuit from short circuiting

(iv) to put on or off the mains.

(h) If out of the two lighted bulbs in a room, one bulb suddenly fuses, then:

(i) other bulb will glow more

(ii) other bulb will glow less

(iii) other bulb will also fuse

(iv) other bulb will remain lighted unaffected.

Discussion

7063.	Why two holes are made in an oil can to pour out oil from it?
Answer» Why two holes are made in an oil can to pour out oil from it?

Discussion

7064.	Easy example of charging by induction
Answer» Easy example of charging by induction

Discussion

7065.	The sound waves with a frequency greater than 20 KHz are known as:
Answer» The sound waves with a frequency greater than 20 KHz are known as:

Discussion

7066.	Army tanks are provided with Caterpillar tracks .what is the reason for this
Answer» Army tanks are provided with Caterpillar tracks .what is the reason for this

Discussion

7067.	What is the minimum distance required To produce distance echo is
Answer» What is the minimum distance required To produce distance echo is

Discussion

7068.	We say that interaction of two objects are necessary for a force to come into play. In the other hand we say that non-contact forces can come into play even the objects are not in contact. Interaction is required for a force to come into play or not?
Answer» We say that interaction of two objects are necessary for a force to come into play. In the other hand we say that non-contact forces can come into play even the objects are not in contact. Interaction is required for a force to come into play or not?

Discussion

7069.	A ball is rolling towards north direction , then which direction will the frictional force act ?
Answer» A ball is rolling towards north direction , then which direction will the frictional force act ?

Discussion

7070.	What gives the planet's different colors?
Answer» What gives the planet's different colors?

Discussion

7071.	Neha is pushing a box having wheels with a force of 40N. Prashant joins in and starts pushing the box with a force of same magnitude and in the same direction. a) What will be the net force on the box? What will be the direction of motion of object with respect to the applied force? b) which type of force will be exerted on the wheels while the box is pushed? c) What will happen to the motion of the box if Prashant exerts force of lesser magnitude and in the direction opposite to that of Neha?
Answer» Neha is pushing a box having wheels with a force of 40N. Prashant joins in and starts pushing the box with a force of same magnitude and in the same direction. a) What will be the net force on the box? What will be the direction of motion of object with respect to the applied force? b) which type of force will be exerted on the wheels while the box is pushed? c) What will happen to the motion of the box if Prashant exerts force of lesser magnitude and in the direction opposite to that of Neha?

7071.

Neha is pushing a box having wheels with a force of 40N. Prashant joins in and starts pushing the box with a force of same magnitude and in the same direction. a) What will be the net force on the box? What will be the direction of motion of object with respect to the applied force? b) which type of force will be exerted on the wheels while the box is pushed? c) What will happen to the motion of the box if Prashant exerts force of lesser magnitude and in the direction opposite to that of Neha?

Answer»

Neha is pushing a box having wheels with a force of 40N. Prashant joins in and starts pushing the box with a force of same magnitude and in the same direction.

a) What will be the net force on the box? What will be the direction of motion of object with respect to the applied force?

b) which type of force will be exerted on the wheels while the box is pushed?

c) What will happen to the motion of the box if Prashant exerts force of lesser magnitude and in the direction opposite to that of Neha?

Discussion

7072.	Define capillary action.
Answer» Define capillary action.

Discussion

7073.	Light doesn't need a medium to propagate. But when visible, is it compulsory that we see it only when it is reflected or the source?
Answer» Light doesn't need a medium to propagate. But when visible, is it compulsory that we see it only when it is reflected or the source?

Discussion

7074.	The power of a motor pump in a house is 20 W. How much water per minute can the pump raise to a height of 10 m? Take acceleration due to gravity g=10 ms−2
Answer» The power of a motor pump in a house is $20 W$ . How much water per minute can the pump raise to a height of $10 m$ ? Take acceleration due to gravity $g = 10 m s^{- 2}$

Discussion

7075.	Fill in the blanks:- The nucleus of a _______ atom (such as uranium, plutonium or thorium), when bombarded with__________ neutrons, can be split apart into lighter nuclei.
Answer» Fill in the blanks:- The nucleus of a _______ atom (such as uranium, plutonium or thorium), when bombarded with__________ neutrons, can be split apart into lighter nuclei.

7075.

Fill in the blanks:- The nucleus of a _ atom (such as uranium, plutonium or thorium), when bombarded with____ neutrons, can be split apart into lighter nuclei.

Answer»

Fill in the blanks:-

The nucleus of a _______ atom (such as uranium, plutonium or thorium),

when bombarded with__________ neutrons, can be split apart into lighter

nuclei.

Discussion

7076.	A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground.
Answer» A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground.

Discussion

7077.	What is bouyant force ?give it's detial.also give it's one example
Answer» What is bouyant force ?give it's detial.also give it's one example

Discussion

7078.	Question 22 Look at Fig. carefully and answer the following question: (a) In which part of the sky would you see the full moon in the evening? (b) In which part of the sky would you see the crescent moon in the evening?
Answer» Question 22 Look at Fig. carefully and answer the following question: (a) In which part of the sky would you see the full moon in the evening? (b) In which part of the sky would you see the crescent moon in the evening?

Discussion

7079.	Which of the following three is travelling the fastest?
Answer» Which of the following three is travelling the fastest?

Discussion

7080.	When we remove polyester or woollen clothes in dark, we can see a spark and hear a crackling sound. Which of the following is responsible for it?
Answer» When we remove polyester or woollen clothes in dark, we can see a spark and hear a crackling sound. Which of the following is responsible for it?

Discussion

7081.	What is Damping?
Answer» What is Damping?

Discussion

7082.	Two notes played on the same instruments will have _____.
Answer» Two notes played on the same instruments will have _____.

Discussion

7083.	On what principle does the screw gauge work?
Answer» On what principle does the screw gauge work?

Discussion

7084.	1 metre can be defined as the distance travelled by light in in vacuum.
Answer» $1 metre$ can be defined as the distance travelled by light in in vacuum.

Discussion

7085.	Why is short sightedness called so?
Answer» Why is short sightedness called so?

Discussion

7086.	The objects are of the same dimension, but different mass are immersed in a given fluid, all three will experience a buoyant force. The order of magnitude of buoyant force experienced is
Answer» The objects are of the same dimension, but different mass are immersed in a given fluid, all three will experience a buoyant force. The order of magnitude of buoyant force experienced is

7086.

The objects are of the same dimension, but different mass are immersed in a given fluid, all three will experience a buoyant force. The order of magnitude of buoyant force experienced is

Answer»

The objects are of the same dimension, but different mass are immersed in a given fluid, all three will experience a buoyant force. The order of magnitude of buoyant force experienced is

Discussion

7087.	Why is the bottom part of the foundation of a building made wider ?
Answer» Why is the bottom part of the foundation of a building made wider ?

Discussion

7088.	It is easier to swim in sea water than in river water. Explain the reason.
Answer» It is easier to swim in sea water than in river water. Explain the reason.

Discussion

7089.	In the tug-of-war match, the rope does not move to either side although it is pulled by the two team. What can you say about the resultant force? What should be done by anyone of the two team to win the match?
Answer» In the tug-of-war match, the rope does not move to either side although it is pulled by the two team. What can you say about the resultant force? What should be done by anyone of the two team to win the match?

Discussion

7090.	A 200m long train has to cross a platform which is 500m long. If the train is traveling at a speed of 70m/s, how long will the train take to cross the platform?
Answer» A 200m long train has to cross a platform which is 500m long. If the train is traveling at a speed of 70m/s, how long will the train take to cross the platform?

Discussion

7091.	(a) What is meant by the (a) 'pitch' of sound, and (b) 'quality' of sound? (b) What is ultrasound? State two uses of ultrasound.
Answer» (a) What is meant by the (a) 'pitch' of sound, and (b) 'quality' of sound? (b) What is ultrasound? State two uses of ultrasound.

7091.

(a) What is meant by the (a) 'pitch' of sound, and (b) 'quality' of sound? (b) What is ultrasound? State two uses of ultrasound.

Answer»

(a) What is meant by the (a) 'pitch' of sound, and (b) 'quality' of sound?

(b) What is ultrasound? State two uses of ultrasound.

Discussion

7092.	Explain why, the flash of lightning is seen first but the sound of thunder is heard a little later (though lightning and thunder take place in the sky at the same time and same distance from us).
Answer» Explain why, the flash of lightning is seen first but the sound of thunder is heard a little later (though lightning and thunder take place in the sky at the same time and same distance from us).

Discussion

7093.	Name two metals which are purified by using the chemical effect of current (or electrolysis).
Answer» Name two metals which are purified by using the chemical effect of current (or electrolysis).

Discussion

7094.	A small device pulls iron nails from a distance. Which type of force is involved in this process?
Answer» A small device pulls iron nails from a distance. Which type of force is involved in this process?

Discussion

7095.	The free electrons of the metal conductor are charge carriers. Explain the statement.
Answer» The free electrons of the metal conductor are charge carriers. Explain the statement.

Discussion

7096.	Define thrust ?
Answer» Define thrust ?

Discussion

7097.	___ is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work
Answer» ___ is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work

Discussion

7098.	Identify the actions involved in the following situations as push or pull, or both: (a) opening a drawer (b) a cricket ball hit by a batsman (c) drawnig a bucket of water from a well (d) moving a book placed on a table (e) a football player taking a penalty corner (f) moving a wheel barrow
Answer» Identify the actions involved in the following situations as push or pull, or both: (a) opening a drawer (b) a cricket ball hit by a batsman (c) drawnig a bucket of water from a well (d) moving a book placed on a table (e) a football player taking a penalty corner (f) moving a wheel barrow

7098.

Identify the actions involved in the following situations as push or pull, or both: (a) opening a drawer (b) a cricket ball hit by a batsman (c) drawnig a bucket of water from a well (d) moving a book placed on a table (e) a football player taking a penalty corner (f) moving a wheel barrow

Answer»

Identify the actions involved in the following situations as push or pull, or both:

(a) opening a drawer

(b) a cricket ball hit by a batsman

(c) drawnig a bucket of water from a well

(d) moving a book placed on a table

(e) a football player taking a penalty corner

(f) moving a wheel barrow

Discussion

7099.	Name and define the characteristic which enables one to distinguish two sound of same loudness, but of different frequencies, given by the same instrument.
Answer» Name and define the characteristic which enables one to distinguish two sound of same loudness, but of different frequencies, given by the same instrument.

Discussion

7100.	It is given that the value of sin isin r when light enters from medium P to medium Q is less than 1. Which of the following statements is true?
Answer» It is given that the value of $\frac{s i n i}{s i n r}$ when light enters from medium P to medium Q is less than 1. Which of the following statements is true?

7100.

It is given that the value of sin isin r when light enters from medium P to medium Q is less than 1. Which of the following statements is true?

Answer»

It is given that the value of $\frac{s i n i}{s i n r}$ when light enters from medium P to medium Q is less than 1.

Which of the following statements is true?

Discussion

Explore topic-wise InterviewSolutions in .

A puppy, trapped by a current carrying wire, was barking for help. A man passing by used a wooden stick to save it. Why did he prefer wooden stick and not his hands?

What is a force? How can you test for sure if a force is acting or not? [2 MARKS]

Mathematically, velocity is related with displacement as speed is related with?

​​​​​​Is current constituted by protons? If so then how come we say that current moves in the opposite direction to the direction of electrons when protons do no move from their position?

Describe a simple experiment to show that at a given depth, a liquid exerts same pressure in all directions.

Why wood absorbs sound?

The frequencies of notes given by flute, guitar and trumpet are respectively 400 Hz, 200 Hz and 500 Hz. Which one of these has the highest pitch ?

A body is moving in a constant state of motion on rolling on ground A)Friction is acting in the same direction B)Friction is absent C)Friction is greater D)All of these

Question 17.1 Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21).

Question 1 (c) Fill in the blank. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.

Light changes its path as the medium changes during the transit. This is because of

Why two holes are made in an oil can to pour out oil from it?

Easy example of charging by induction

The sound waves with a frequency greater than 20 KHz are known as:

Army tanks are provided with Caterpillar tracks .what is the reason for this

What is the minimum distance required To produce distance echo is

We say that interaction of two objects are necessary for a force to come into play. In the other hand we say that non-contact forces can come into play even the objects are not in contact. Interaction is required for a force to come into play or not?

A ball is rolling towards north direction , then which direction will the frictional force act ?

What gives the planet's different colors?

Define capillary action.

Light doesn't need a medium to propagate. But when visible, is it compulsory that we see it only when it is reflected or the source?

The power of a motor pump in a house is 20 W. How much water per minute can the pump raise to a height of 10 m? Take acceleration due to gravity g=10 ms−2

Fill in the blanks:- The nucleus of a _______ atom (such as uranium, plutonium or thorium), when bombarded with__________ neutrons, can be split apart into lighter nuclei.

A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground.

What is bouyant force ?give it's detial.also give it's one example

Question 22 Look at Fig. carefully and answer the following question: (a) In which part of the sky would you see the full moon in the evening? (b) In which part of the sky would you see the crescent moon in the evening?

Which of the following three is travelling the fastest?

When we remove polyester or woollen clothes in dark, we can see a spark and hear a crackling sound. Which of the following is responsible for it?

What is Damping?

Two notes played on the same instruments will have _____.

On what principle does the screw gauge work?

1 metre can be defined as the distance travelled by light in in vacuum.

Why is short sightedness called so?

The objects are of the same dimension, but different mass are immersed in a given fluid, all three will experience a buoyant force. The order of magnitude of buoyant force experienced is

Why is the bottom part of the foundation of a building made wider ?

It is easier to swim in sea water than in river water. Explain the reason.

In the tug-of-war match, the rope does not move to either side although it is pulled by the two team. What can you say about the resultant force? What should be done by anyone of the two team to win the match?

A 200m long train has to cross a platform which is 500m long. If the train is traveling at a speed of 70m/s, how long will the train take to cross the platform?

(a) What is meant by the (a) 'pitch' of sound, and (b) 'quality' of sound? (b) What is ultrasound? State two uses of ultrasound.

Explain why, the flash of lightning is seen first but the sound of thunder is heard a little later (though lightning and thunder take place in the sky at the same time and same distance from us).

Name two metals which are purified by using the chemical effect of current (or electrolysis).

A small device pulls iron nails from a distance. Which type of force is involved in this process?

The free electrons of the metal conductor are charge carriers. Explain the statement.

Define thrust ?

___ is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work

Identify the actions involved in the following situations as push or pull, or both: (a) opening a drawer (b) a cricket ball hit by a batsman (c) drawnig a bucket of water from a well (d) moving a book placed on a table (e) a football player taking a penalty corner (f) moving a wheel barrow

Name and define the characteristic which enables one to distinguish two sound of same loudness, but of different frequencies, given by the same instrument.

It is given that the value of sin isin r when light enters from medium P to medium Q is less than 1. Which of the following statements is true?

Is current constituted by protons? If so then how come we say that current moves in the opposite direction to the direction of electrons when protons do no move from their position?

Fill in the blanks:- The nucleus of a _ atom (such as uranium, plutonium or thorium), when bombarded with____ neutrons, can be split apart into lighter nuclei.