3752 + Interview Questions in Physics Page 57 InterviewSolution

2801.	what is random motion
Answer» what is random motion

Discussion

2802.	A region of darkness, which is formed when the path of light is blocked by an opaque body is called ___________.
Answer» A region of darkness, which is formed when the path of light is blocked by an opaque body is called ___________.

Discussion

2803.	Riva bought a vessel of volume 0.2 m3 for storing milk. How many litres of milk can she store in the vessel?
Answer» Riva bought a vessel of volume $0.2 m^{3}$ for storing milk. How many litres of milk can she store in the vessel?

Discussion

2804.	Suppose you want to level a field using a lawn roller. Would you prefer to push or pull it? Why?
Answer» Suppose you want to level a field using a lawn roller. Would you prefer to push or pull it? Why?

Discussion

2805.	Electricity to the bulb in a torch is provided by :
Answer» Electricity to the bulb in a torch is provided by :

Discussion

2806.	In which of the following case(s) can we say that the object is moving?
Answer» In which of the following case(s) can we say that the object is moving?

Discussion

2807.	The figure displays a lemon crusher. Name the class of the lever.
Answer» The figure displays a lemon crusher. Name the class of the lever.

2807.

The figure displays a lemon crusher. Name the class of the lever.

Answer»

The figure displays a lemon crusher. Name the class of the lever.

Discussion

2808.	In a class II lever, ______ comes between the effort and the fulcrum.
Answer» In a class II lever, ______ comes between the effort and the fulcrum.

Discussion

2809.	The person sitting to the third left of A is
Answer» The person sitting to the third left of A is

Discussion

2810.	Question 21 In Fig., a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?
Answer» Question 21 In Fig., a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?

2810.

Question 21 In Fig., a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?

Answer»

Question 21

In Fig., a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?

Discussion

2811.	What are non-luminous objects? Give two examples. [2 MARKS]
Answer» What are non-luminous objects? Give two examples. [2 MARKS]

Discussion

2812.	When seen from the ground, an apple falling from a tree is under______motion.
Answer» When seen from the ground, an apple falling from a tree is under______motion.

Discussion

2813.	Which of the following is not a fundamental unit?
Answer» Which of the following is not a fundamental unit?

Discussion

2814.	Shadow of an object is formed when the object
Answer» Shadow of an object is formed when the object

Discussion

2815.	Doppler's effect in sound is:
Answer» Doppler's effect in sound is:

Discussion

2816.	Class III lever have mechanical advantage less than one. Why are they then used?
Answer» Class III lever have mechanical advantage less than one. Why are they then used?

Discussion

2817.	How to write kelvin in symbol and in full we have to write kelvin in which form Kelvin Or else like this kelvin We will write the K capital or small. Question . Describe in steps how would you measure the length of a pencil using a metre ruler Teacher I want the answer in short.
Answer» How to write kelvin in symbol and in full we have to write kelvin in which form Kelvin Or else like this kelvin We will write the K capital or small. Question . Describe in steps how would you measure the length of a pencil using a metre ruler Teacher I want the answer in short.

2817.

How to write kelvin in symbol and in full we have to write kelvin in which form Kelvin Or else like this kelvin We will write the K capital or small. Question . Describe in steps how would you measure the length of a pencil using a metre ruler Teacher I want the answer in short.

Answer»

How to write kelvin in symbol and in full we have to write kelvin in which form

Kelvin

Or else like this

kelvin

We will write the K capital or small.

Question . Describe in steps how would you measure the length of a pencil using a metre ruler

Teacher I want the answer in short.

Discussion

2818.	Question 15 Paheli connected two bulbs to a cell as shown in the figure. She found that filament of the bulb B is broken. Will the bulb A glow in this circuit? Give reason.
Answer» Question 15 Paheli connected two bulbs to a cell as shown in the figure. She found that filament of the bulb B is broken. Will the bulb A glow in this circuit? Give reason.

2818.

Question 15 Paheli connected two bulbs to a cell as shown in the figure. She found that filament of the bulb B is broken. Will the bulb A glow in this circuit? Give reason.

Answer»

Question 15

Paheli connected two bulbs to a cell as shown in the figure.

She found that filament of the bulb B is broken. Will the bulb A glow in this circuit? Give reason.

Discussion

2819.	You are given an iron strip. How will you convert it into a permanent magnet?
Answer» You are given an iron strip. How will you convert it into a permanent magnet?

Discussion

2820.	The Fulcrum lies in between the Effort and the Load in:
Answer» The Fulcrum lies in between the Effort and the Load in:

Discussion

2821.	The distance covered by a body can be measured in the same unit as that of
Answer» The distance covered by a body can be measured in the same unit as that of

Discussion

2822.	Which of the following tasks can be performed by light?
Answer» Which of the following tasks can be performed by light?

Discussion

2823.	Until recently many astronomers believed that asteroids travel about the solar system unaccompanied by satellites. These astronomers assumed this because they considered asteroid-satellite systems inherently unstable. Theoreticians could have told them otherwise: even minuscule bodies in the solar system can theoretically have satellites, as long as everything is in proper scale. If a bowling ball were orbiting about the Sun in the asteroid belt, it could have a pebble orbiting it as far away as a few hundred radii (or about 50 meters) without losing the pebble to the Sun’s gravitational pull Observations now suggest that asteroid satellites may exists not only in theory but also in reality. Several astronomers have noticed, while watching asteroids pass briefly in front of stars, that something besides the known asteroid sometimes blocks out the star as well. Is that something a satellite? The most convincing such report concerns the asteroid Herculina, which was due to pass in front of a star in 1978. Astronomers waiting for the predicted event found not just one occultation, or eclipse, of the star, but two distinct drops in brightness. One was the predicted occultation, exactly on time. The other, lasting about five seconds, preceded the predicted event by about two minutes. The presence of a secondary body near Herculina thus seemed strongly indicated. To cause the secondary occultation, an unseen satellite would have to be about 45 kilometers in diameter, a quarter of the size of Herculina, and at a distance of 990 kilometers from the asteroid at the time. These values are within theoretical bounds, and such an asteroid-satellite pair could be stable. With the Herculina event, apparent secondary occultations became “respectable”—and more commonly reported. In fact, so common did reports of secondary events become that they are now simply too numerous for all of them to be accurate. Even if every asteroid has as many satellites as can be fitted around it without an undue number of collisions, only one in every hundred primary occultations would be accompanied by a secondary event (one in every thousand if asteroid satellites system resembled those of the planets). Yet even astronomers who find the case for asteroid satellites unconvincing at present say they would change their minds if a photoelectric record were made of a well-behaved secondary event. By “well-behaved” they mean that during occultation the observed brightness must drop sharply as the star winks out and must rise sharply as it reappears from behind the obstructing object, but the brightness during the secondary occultation must drop to that of the asteroid, no higher and no lower. This would make it extremely unlikely that an airplane or a glitch in the instruments was masquerading as an occulting body. Q22. Which one of the following best expresses the main idea of the passage?
Answer» Until recently many astronomers believed that asteroids travel about the solar system unaccompanied by satellites. These astronomers assumed this because they considered asteroid-satellite systems inherently unstable. Theoreticians could have told them otherwise: even minuscule bodies in the solar system can theoretically have satellites, as long as everything is in proper scale. If a bowling ball were orbiting about the Sun in the asteroid belt, it could have a pebble orbiting it as far away as a few hundred radii (or about 50 meters) without losing the pebble to the Sun’s gravitational pull Observations now suggest that asteroid satellites may exists not only in theory but also in reality. Several astronomers have noticed, while watching asteroids pass briefly in front of stars, that something besides the known asteroid sometimes blocks out the star as well. Is that something a satellite? The most convincing such report concerns the asteroid Herculina, which was due to pass in front of a star in 1978. Astronomers waiting for the predicted event found not just one occultation, or eclipse, of the star, but two distinct drops in brightness. One was the predicted occultation, exactly on time. The other, lasting about five seconds, preceded the predicted event by about two minutes. The presence of a secondary body near Herculina thus seemed strongly indicated. To cause the secondary occultation, an unseen satellite would have to be about 45 kilometers in diameter, a quarter of the size of Herculina, and at a distance of 990 kilometers from the asteroid at the time. These values are within theoretical bounds, and such an asteroid-satellite pair could be stable. With the Herculina event, apparent secondary occultations became “respectable”—and more commonly reported. In fact, so common did reports of secondary events become that they are now simply too numerous for all of them to be accurate. Even if every asteroid has as many satellites as can be fitted around it without an undue number of collisions, only one in every hundred primary occultations would be accompanied by a secondary event (one in every thousand if asteroid satellites system resembled those of the planets). Yet even astronomers who find the case for asteroid satellites unconvincing at present say they would change their minds if a photoelectric record were made of a well-behaved secondary event. By “well-behaved” they mean that during occultation the observed brightness must drop sharply as the star winks out and must rise sharply as it reappears from behind the obstructing object, but the brightness during the secondary occultation must drop to that of the asteroid, no higher and no lower. This would make it extremely unlikely that an airplane or a glitch in the instruments was masquerading as an occulting body. Q22. Which one of the following best expresses the main idea of the passage?

2823.

Until recently many astronomers believed that asteroids travel about the solar system unaccompanied by satellites. These astronomers assumed this because they considered asteroid-satellite systems inherently unstable. Theoreticians could have told them otherwise: even minuscule bodies in the solar system can theoretically have satellites, as long as everything is in proper scale. If a bowling ball were orbiting about the Sun in the asteroid belt, it could have a pebble orbiting it as far away as a few hundred radii (or about 50 meters) without losing the pebble to the Sun’s gravitational pull Observations now suggest that asteroid satellites may exists not only in theory but also in reality. Several astronomers have noticed, while watching asteroids pass briefly in front of stars, that something besides the known asteroid sometimes blocks out the star as well. Is that something a satellite? The most convincing such report concerns the asteroid Herculina, which was due to pass in front of a star in 1978. Astronomers waiting for the predicted event found not just one occultation, or eclipse, of the star, but two distinct drops in brightness. One was the predicted occultation, exactly on time. The other, lasting about five seconds, preceded the predicted event by about two minutes. The presence of a secondary body near Herculina thus seemed strongly indicated. To cause the secondary occultation, an unseen satellite would have to be about 45 kilometers in diameter, a quarter of the size of Herculina, and at a distance of 990 kilometers from the asteroid at the time. These values are within theoretical bounds, and such an asteroid-satellite pair could be stable. With the Herculina event, apparent secondary occultations became “respectable”—and more commonly reported. In fact, so common did reports of secondary events become that they are now simply too numerous for all of them to be accurate. Even if every asteroid has as many satellites as can be fitted around it without an undue number of collisions, only one in every hundred primary occultations would be accompanied by a secondary event (one in every thousand if asteroid satellites system resembled those of the planets). Yet even astronomers who find the case for asteroid satellites unconvincing at present say they would change their minds if a photoelectric record were made of a well-behaved secondary event. By “well-behaved” they mean that during occultation the observed brightness must drop sharply as the star winks out and must rise sharply as it reappears from behind the obstructing object, but the brightness during the secondary occultation must drop to that of the asteroid, no higher and no lower. This would make it extremely unlikely that an airplane or a glitch in the instruments was masquerading as an occulting body. Q22. Which one of the following best expresses the main idea of the passage?

Answer»

Until recently many astronomers believed that asteroids travel about the solar system unaccompanied by satellites. These astronomers assumed this because they considered asteroid-satellite systems inherently unstable. Theoreticians could have told them otherwise: even minuscule bodies in the solar system can theoretically have satellites, as long as everything is in proper scale. If a bowling ball were orbiting about the Sun in the asteroid belt, it could have a pebble orbiting it as far away as a few hundred radii (or about 50 meters) without losing the pebble to the Sun’s gravitational pull

Observations now suggest that asteroid satellites may exists not only in theory but also in reality. Several astronomers have noticed, while watching asteroids pass briefly in front of stars, that something besides the known asteroid sometimes blocks out the star as well. Is that something a satellite?

The most convincing such report concerns the asteroid Herculina, which was due to pass in front of a star in 1978. Astronomers waiting for the predicted event found not just one occultation, or eclipse, of the star, but two distinct drops in brightness. One was the predicted occultation, exactly on time. The other, lasting about five seconds, preceded the predicted event by about two minutes. The presence of a secondary body near Herculina thus seemed strongly indicated. To cause the secondary occultation, an unseen satellite would have to be about 45 kilometers in diameter, a quarter of the size of Herculina, and at a distance of 990 kilometers from the asteroid at the time. These values are within theoretical bounds, and such an asteroid-satellite pair could be stable.

With the Herculina event, apparent secondary occultations became “respectable”—and more commonly reported. In fact, so common did reports of secondary events become that they are now simply too numerous for all of them to be accurate. Even if every asteroid has as many satellites as can be fitted around it without an undue number of collisions, only one in every hundred primary occultations would be accompanied by a secondary event (one in every thousand if asteroid satellites system resembled those of the planets).

Yet even astronomers who find the case for asteroid satellites unconvincing at present say they would change their minds if a photoelectric record were made of a well-behaved secondary event. By “well-behaved” they mean that during occultation the observed brightness must drop sharply as the star winks out and must rise sharply as it reappears from behind the obstructing object, but the brightness during the secondary occultation must drop to that of the asteroid, no higher and no lower. This would make it extremely unlikely that an airplane or a glitch in the instruments was masquerading as an occulting body.

Q22. Which one of the following best expresses the main idea of the passage?

Discussion

2824.	Does putting a magnet in water demagentize it????
Answer» Does putting a magnet in water demagentize it????

Discussion

2825.	Give a simple experiment to show that matter occupies space.
Answer» Give a simple experiment to show that matter occupies space.

Discussion

2826.	Identify fossil fuels from the given options.
Answer» Identify fossil fuels from the given options.

Discussion

2827.	Bird: Chirp:: Horse : ?
Answer» Bird: Chirp:: Horse : ?

Discussion

2828.	Which of the following is/are the unit(s) for measuring volume?
Answer» Which of the following is/are the unit(s) for measuring volume?

Discussion

2829.	Question 10 Four identical iron bars were dipped in a heap of iron filings one by one. Fig. shows the amount of iron filings sticking to each of them. (a) Which of the iron bar is likely to be the strongest magnet? (b) Which of the iron bars is not a magnet? Justify your answer.
Answer» Question 10 Four identical iron bars were dipped in a heap of iron filings one by one. Fig. shows the amount of iron filings sticking to each of them. (a) Which of the iron bar is likely to be the strongest magnet? (b) Which of the iron bars is not a magnet? Justify your answer.

2829.

Question 10 Four identical iron bars were dipped in a heap of iron filings one by one. Fig. shows the amount of iron filings sticking to each of them. (a) Which of the iron bar is likely to be the strongest magnet? (b) Which of the iron bars is not a magnet? Justify your answer.

Answer»

Question 10

Four identical iron bars were dipped in a heap of iron filings one by one. Fig. shows the amount of iron filings sticking to each of them.

(a) Which of the iron bar is likely to be the strongest magnet?
(b) Which of the iron bars is not a magnet? Justify your answer.

Discussion

2830.	Which of the following is a property of a typical magnet?
Answer» Which of the following is a property of a typical magnet?

Discussion

2831.	Identify the festival shown here.
Answer» Identify the festival shown here.

2831.

Identify the festival shown here.

Answer»

Identify the festival shown here.

Discussion

2832.	________is the property of liquid responsible for its tendency to form a spherical drop on a flat surface.
Answer» ________is the property of liquid responsible for its tendency to form a spherical drop on a flat surface.

Discussion

2833.	Choose the synonym of Sly
Answer» Choose the synonym of Sly

2833.

Choose the synonym of Sly

Answer»

Choose the synonym of

Sly

Discussion

2834.	Which of the following statements is not correct for fluids?
Answer» Which of the following statements is not correct for fluids?

Discussion

2835.	A machine is not 100% efficient because :
Answer» A machine is not 100% efficient because :

Discussion

2836.	The temperature at which solid and liquid coexist in equilibrium is called ___.
Answer» The temperature at which solid and liquid coexist in equilibrium is called ___.

Discussion

2837.	What are the disadvantages of using a biomass fuel?
Answer» What are the disadvantages of using a biomass fuel?

Discussion

2838.	There are two surfaces, A and B in contact with each other. Consider the following situations: Situation I: Both A and B are at rest. Situation II: A is moving while B is at rest and A is over B. Situation III: A is at rest while B is moving and A is over B. Situation IV: A is at rest while B is moving and B is over A. In which of the given situations would you expect frictional force to come into play?
Answer» There are two surfaces, A and B in contact with each other. Consider the following situations: Situation I: Both A and B are at rest. Situation II: A is moving while B is at rest and A is over B. Situation III: A is at rest while B is moving and A is over B. Situation IV: A is at rest while B is moving and B is over A. In which of the given situations would you expect frictional force to come into play?

Discussion

2839.	When a south pole of a magnet is brought near the north pole of a freely suspended magnetic needle, it will_____
Answer» When a south pole of a magnet is brought near the north pole of a freely suspended magnetic needle, it will_____

Discussion

2840.	Free body diagram of a brick, sliding down from right to left on a rough slope is
Answer» Free body diagram of a brick, sliding down from right to left on a rough slope is

Discussion

2841.	Which of the following helps us to hold objects together?
Answer» Which of the following helps us to hold objects together?

Discussion

2842.	The threads on a screw are an example of _______ .
Answer» The threads on a screw are an example of _______ .

Discussion

2843.	Harish runs faster than Suresh to cover the same distance. Which fundamental physical quantity is used for comparing their speeds?
Answer» Harish runs faster than Suresh to cover the same distance. Which fundamental physical quantity is used for comparing their speeds?

Discussion

2844.	Wood is a insulator or conductor?
Answer» Wood is a insulator or conductor?

Discussion

2845.	On a bright sunny day, Shaunak observed the sun through a small hole made in a sheet of foil. The image obtained seemed to be upright. What could be the reason for this?
Answer» On a bright sunny day, Shaunak observed the sun through a small hole made in a sheet of foil. The image obtained seemed to be upright. What could be the reason for this?

Discussion

2846.	Electricity flows in an electric circuit which is
Answer» Electricity flows in an electric circuit which is

Discussion

2847.	Why are the shadows formed in the morning and evening bigger than the shadows formed in the noon? [3 MARKS]
Answer» Why are the shadows formed in the morning and evening bigger than the shadows formed in the noon? [3 MARKS]

Discussion

2848.	What is an electromagnet? Give examples where it is used. [2 MARKS]
Answer» What is an electromagnet? Give examples where it is used. [2 MARKS]

Discussion

2849.	In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of mirror A – point on mirror D – point on principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:
Answer» In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of mirror A – point on mirror D – point on principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:

2849.

In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of mirror A – point on mirror D – point on principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:

Answer»

In the given mirror

C – centre of the sphere to which the mirror is part of

F – focus of the mirror

P – pole of mirror

A – point on mirror

D – point on principal axis.

If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:

Discussion

2850.	What are the similarities and differences between periodic motion and vibratory motion?
Answer» What are the similarities and differences between periodic motion and vibratory motion?

Discussion

Explore topic-wise InterviewSolutions in .

what is random motion

A region of darkness, which is formed when the path of light is blocked by an opaque body is called ___________.

Riva bought a vessel of volume 0.2 m3 for storing milk. How many litres of milk can she store in the vessel?

Suppose you want to level a field using a lawn roller. Would you prefer to push or pull it? Why?

Electricity to the bulb in a torch is provided by :

In which of the following case(s) can we say that the object is moving?

The figure displays a lemon crusher. Name the class of the lever.

In a class II lever, ______ comes between the effort and the fulcrum.

The person sitting to the third left of A is

Question 21 In Fig., a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?

What are non-luminous objects? Give two examples. [2 MARKS]

When seen from the ground, an apple falling from a tree is under______motion.

Which of the following is not a fundamental unit?

Shadow of an object is formed when the object

Doppler's effect in sound is:

Class III lever have mechanical advantage less than one. Why are they then used?

How to write kelvin in symbol and in full we have to write kelvin in which form Kelvin Or else like this kelvin We will write the K capital or small. Question . Describe in steps how would you measure the length of a pencil using a metre ruler Teacher I want the answer in short.

Question 15 Paheli connected two bulbs to a cell as shown in the figure. She found that filament of the bulb B is broken. Will the bulb A glow in this circuit? Give reason.

You are given an iron strip. How will you convert it into a permanent magnet?

The Fulcrum lies in between the Effort and the Load in:

The distance covered by a body can be measured in the same unit as that of

Which of the following tasks can be performed by light?

Does putting a magnet in water demagentize it????

Give a simple experiment to show that matter occupies space.

Identify fossil fuels from the given options.

Bird: Chirp:: Horse : ?

Which of the following is/are the unit(s) for measuring volume?

Question 10 Four identical iron bars were dipped in a heap of iron filings one by one. Fig. shows the amount of iron filings sticking to each of them. (a) Which of the iron bar is likely to be the strongest magnet? (b) Which of the iron bars is not a magnet? Justify your answer.

Which of the following is a property of a typical magnet?

Identify the festival shown here.

________is the property of liquid responsible for its tendency to form a spherical drop on a flat surface.

Choose the synonym of Sly

Which of the following statements is not correct for fluids?

A machine is not 100% efficient because :

The temperature at which solid and liquid coexist in equilibrium is called ___.

What are the disadvantages of using a biomass fuel?

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

Free body diagram of a brick, sliding down from right to left on a rough slope is

Which of the following helps us to hold objects together?

The threads on a screw are an example of _______ .

Harish runs faster than Suresh to cover the same distance. Which fundamental physical quantity is used for comparing their speeds?

Wood is a insulator or conductor?

On a bright sunny day, Shaunak observed the sun through a small hole made in a sheet of foil. The image obtained seemed to be upright. What could be the reason for this?

Electricity flows in an electric circuit which is

Why are the shadows formed in the morning and evening bigger than the shadows formed in the noon? [3 MARKS]

What is an electromagnet? Give examples where it is used. [2 MARKS]

In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of mirror A – point on mirror D – point on principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:

What are the similarities and differences between periodic motion and vibratory motion?