6277 + Interview Questions in Physics Page 121 InterviewSolution

6001.	The volume of a cube whose edge is 3x units is ______.
Answer» The volume of a cube whose edge is $3 x units$ is ______.

Discussion

6002.	A spring balance can be used to measure: A. Mass of an object B. Force acting on an object C. Density of an object D. Weight of an object (a) A and B (b) B and C (c) B and D (d) only D
Answer» A spring balance can be used to measure: A. Mass of an object B. Force acting on an object C. Density of an object D. Weight of an object (a) A and B (b) B and C (c) B and D (d) only D

Discussion

6003.	Two spherical balls A and B made of the same material, are heated to the same temperature. They are then placed in identical surroundings. If the diameter of A is twice that of B, the ratio of rates of cooling of A and B will be
Answer» Two spherical balls A and B made of the same material, are heated to the same temperature. They are then placed in identical surroundings. If the diameter of A is twice that of B, the ratio of rates of cooling of A and B will be

Discussion

6004.	What is density
Answer» What is density

Discussion

6005.	If a barometer is kept on the earth's surface then calculate the height of the barometer column h. Atmospheric Pressure (Pa) is 105. The density of mercury (ρm) is 13600 kg m−3. Gravitational acceleration (g) near earth's surface is 10 m s−2.
Answer» If a barometer is kept on the earth's surface then calculate the height of the barometer column $h$ . Atmospheric Pressure ( $P_{a}$ ) is $10^{5}$ . The density of mercury ( $ρ_{m}$ ) is $13600 k g m^{- 3}$ . Gravitational acceleration ( $g$ ) near earth's surface is $10 m s^{- 2}$ .

Discussion

6006.	Magnetic material that can be strongly magnetized are known as ______ substances.
Answer» Magnetic material that can be strongly magnetized are known as ______ substances.

Discussion

6007.	The loudness of the sound is measured in ___ .
Answer» The loudness of the sound is measured in ___ .

Discussion

6008.	Question 11 Avinash can run with a speed of 8 ms−1 against the frictional force of 10 N, and Kapil can move with a speed of 3 ms−1 against the frictional force of 25 N. Who is more powerful and why?
Answer» Question 11 Avinash can run with a speed of $8 m s^{- 1}$ against the frictional force of $10 N$ , and Kapil can move with a speed of $3 m s^{- 1}$ against the frictional force of $25 N$ . Who is more powerful and why?

Discussion

6009.	A body floats or sinks in a liquid depends on the difference in their:
Answer» A body floats or sinks in a liquid depends on the difference in their:

Discussion

6010.	The same amount of current flows through the connecting wires and the bulb filament. However, it is only the filament that glows. Why?
Answer» The same amount of current flows through the connecting wires and the bulb filament. However, it is only the filament that glows. Why?

Discussion

6011.	When you want to illuminate a larger area then which type of reflection you will choose?
Answer» When you want to illuminate a larger area then which type of reflection you will choose?

Discussion

6012.	From 10:00 PM to 11:00 PM, a person drove at 40 km/h and from 11:00 PM to 12 midnight at 50 km/h. What is his average speed in the time interval 10 PM to 12 AM?
Answer» From 10:00 PM to 11:00 PM, a person drove at $40 k m / h$ and from 11:00 PM to 12 midnight at $50 k m / h$ . What is his average speed in the time interval 10 PM to 12 AM?

Discussion

6013.	Explain heat capacity.
Answer» Explain heat capacity.

Discussion

6014.	Planets revolve around the Sun in a definite path. The definite path is known as:
Answer» Planets revolve around the Sun in a definite path. The definite path is known as:

Discussion

6015.	The sound travels fastest in ______.
Answer» The sound travels fastest in ______.

Discussion

6016.	'X' is the mode of transmission of heat that takes place by the movement of hot particles. Identify 'X'.
Answer» 'X' is the mode of transmission of heat that takes place by the movement of hot particles. Identify 'X'.

Discussion

6017.	At what temperature is the Celsius and Fahrenheit equal, if the relation between Celsius and Fahrenheit is F−329=C5
Answer» At what temperature is the Celsius and Fahrenheit equal, if the relation between Celsius and Fahrenheit is $\frac{F - 32}{9} = \frac{C}{5}$

Discussion

6018.	What is kinetic friction?
Answer» What is kinetic friction?

Discussion

6019.	Question 11 An electrician is carrying out some repairs in your house. He wants to replace a fuse with a piece of wire. Would you agree? Give reasons for your response.
Answer» Question 11 An electrician is carrying out some repairs in your house. He wants to replace a fuse with a piece of wire. Would you agree? Give reasons for your response.

Discussion

6020.	Question 11 Stainless steel pans are usually provided with copper bottoms. The reason for this could be that (a) copper bottom makes the pan more durable. (b) such pans appear colourful. (c) copper is a better conductor of heat than the stainless steel. (d) copper is easier to clean than the stainless steel.
Answer» Question 11 Stainless steel pans are usually provided with copper bottoms. The reason for this could be that (a) copper bottom makes the pan more durable. (b) such pans appear colourful. (c) copper is a better conductor of heat than the stainless steel. (d) copper is easier to clean than the stainless steel.

Discussion

6021.	Question 13 A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.
Answer» Question 13 A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

Discussion

6022.	Find the area of the figure given below.
Answer» Find the area of the figure given below.

Discussion

6023.	How water carry electricity?
Answer» How water carry electricity?

Discussion

6024.	The center of the cyclone is known as:
Answer» The center of the cyclone is known as:

Discussion

6025.	Which of these diagrams correctly shows how a ray of light gets reflected?
Answer» Which of these diagrams correctly shows how a ray of light gets reflected?

Discussion

6026.	Which of the following statements is correct?
Answer» Which of the following statements is correct?

Discussion

6027.	Name the general mode of heat transfer in [2 MARKS] a) Solids b) Liquids and gases.
Answer» Name the general mode of heat transfer in [2 MARKS] a) Solids b) Liquids and gases.

Discussion

6028.	Why are the electric wires used in homes usually covered with materials like plastic or rubber?
Answer» Why are the electric wires used in homes usually covered with materials like plastic or rubber?

Discussion

6029.	Water is densest at 4∘C; this is the reason lakes do not completely freeze during extreme winters. Say, the atmosphere is at -θ∘C(θ>0),now the temperature of the lake's water starts to fall, and the denser water from the top sinks, getting the bottom layers up, and cooling them until the temperature reaches 4 ∘C at the upper surface. Now, further reduction in temperature actually makes the water less dense! Hence the colder water stays on top, starts to freeze, until the top layer of ice reaches -θ∘C and the bottom layer at 0 ∘ C . And this layer of ice is the only area through which the water below loses heat (by conduction), slowly increasing the thickness of the ice (because ice is a bad conduction), and for a very long time the water at the bottom of the lake remains at 4 ∘ C! Now, Let the thickness of the layer of ice be y1, at an instant.How much time t, will it take to increase to thickness y2? ρ→ density of the ice K → thermal conductivity of ice. L → Latent heat of fusion θ→ temperature of surface (as mentioned earlier)
Answer» Water is densest at 4 $^{\circ}$ C; this is the reason lakes do not completely freeze during extreme winters. Say, the atmosphere is at - $θ^{\circ} C (θ > 0)$ ,now the temperature of the lake's water starts to fall, and the denser water from the top sinks, getting the bottom layers up, and cooling them until the temperature reaches 4 $^{\circ}$ C at the upper surface. Now, further reduction in temperature actually makes the water less dense! Hence the colder water stays on top, starts to freeze, until the top layer of ice reaches - $θ^{\circ} C$ and the bottom layer at 0 $^{\circ}$ C . And this layer of ice is the only area through which the water below loses heat (by conduction), slowly increasing the thickness of the ice (because ice is a bad conduction), and for a very long time the water at the bottom of the lake remains at 4 $^{\circ}$ C! Now, Let the thickness of the layer of ice be $y_{1}$ , at an instant.How much time t, will it take to increase to thickness $y_{2}$ ? $ρ \to$ density of the ice K $\to$ thermal conductivity of ice. L $\to$ Latent heat of fusion $θ \to$ temperature of surface (as mentioned earlier)

6029.

Water is densest at 4∘C; this is the reason lakes do not completely freeze during extreme winters. Say, the atmosphere is at -θ∘C(θ>0),now the temperature of the lake's water starts to fall, and the denser water from the top sinks, getting the bottom layers up, and cooling them until the temperature reaches 4 ∘C at the upper surface. Now, further reduction in temperature actually makes the water less dense! Hence the colder water stays on top, starts to freeze, until the top layer of ice reaches -θ∘C and the bottom layer at 0 ∘ C . And this layer of ice is the only area through which the water below loses heat (by conduction), slowly increasing the thickness of the ice (because ice is a bad conduction), and for a very long time the water at the bottom of the lake remains at 4 ∘ C! Now, Let the thickness of the layer of ice be y1, at an instant.How much time t, will it take to increase to thickness y2? ρ→ density of the ice K → thermal conductivity of ice. L → Latent heat of fusion θ→ temperature of surface (as mentioned earlier)

Answer»

Water is densest at 4 $^{\circ}$ C; this is the reason lakes do not completely freeze during extreme winters. Say, the atmosphere is at - $θ^{\circ} C (θ > 0)$ ,now the temperature of the lake's water starts to fall, and the denser water from the top sinks, getting the bottom layers up, and cooling them until the temperature reaches 4 $^{\circ}$ C at the upper surface. Now, further reduction in temperature actually makes the water less dense! Hence the colder water stays on top, starts to freeze, until the top layer of ice reaches - $θ^{\circ} C$ and the bottom layer at 0 $^{\circ}$ C . And this layer of ice is the only area through which the water below loses heat (by conduction), slowly increasing the thickness of the ice (because ice is a bad conduction), and for a very long time the water at the bottom of the lake remains at 4 $^{\circ}$ C! Now, Let the thickness of the layer of ice be $y_{1}$ , at an instant.How much time t, will it take to increase to thickness $y_{2}$ ?

$ρ \to$ density of the ice

K $\to$ thermal conductivity of ice.

L $\to$ Latent heat of fusion

$θ \to$ temperature of surface (as mentioned earlier)

Discussion

6030.	When a liquid starts to boil its temperature remains ___ .
Answer» When a liquid starts to boil its temperature remains ___ .

Discussion

6031.	A cab driver picks 1st passenger who is 0.8 km away then picks another passenger who is 0.5 km away from the first passenger. Then drops the 1st passenger to a place that is 2 km away from the second pick up point and drops the 2nd passenger to a place 1.7 km away from the place where he dropped the 1st passenger. If the average speed throughout the journey is 40 kmph. Find out the time taken to complete the whole journey.
Answer» A cab driver picks 1st passenger who is 0.8 km away then picks another passenger who is 0.5 km away from the first passenger. Then drops the 1st passenger to a place that is 2 km away from the second pick up point and drops the 2nd passenger to a place 1.7 km away from the place where he dropped the 1st passenger. If the average speed throughout the journey is 40 kmph. Find out the time taken to complete the whole journey.

Discussion

6032.	What are furlongs?
Answer» What are furlongs?

Discussion

6033.	Some models of room heaters have a fan blowing air,instead of having a heating coil and a relector. Do you think this could be an advantage ? What mode of heat transfer is used while blowing air in the above heater ?
Answer» Some models of room heaters have a fan blowing air,instead of having a heating coil and a relector. Do you think this could be an advantage ? What mode of heat transfer is used while blowing air in the above heater ?

Discussion

6034.	Two children are moving on two skateboards at the same speed, child A has a mass of 20 kg whereas child B has 30 kg mass. Which child has higher kinetic energy?
Answer» Two children are moving on two skateboards at the same speed, child A has a mass of 20 kg whereas child B has 30 kg mass. Which child has higher kinetic energy?

Discussion

6035.	What is conduction? How is conduction different from radiation? [2 MARKS]
Answer» What is conduction? How is conduction different from radiation? [2 MARKS]

Discussion

6036.	How fast should a man weighing 600N needs to run, so that his kinetic energy is 750J? Take g=10ms−2
Answer» How fast should a man weighing $600 N$ needs to run, so that his kinetic energy is $750 J$ ? Take $g = 10 m s^{- 2}$

Discussion

6037.	Mercury thermometers are increasingly being replaced by digital thermometers. Which of the following is a correct reason for this?
Answer» Mercury thermometers are increasingly being replaced by digital thermometers. Which of the following is a correct reason for this?

Discussion

6038.	The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical Surroundings are the same if
Answer» The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical Surroundings are the same if

Discussion

6039.	A man running with a uniform speed ‘u’ on a straight road observes a stationary bus at a distance ‘d’ ahead of him. At that instant, the bus starts with an acceleration ‘a’. The condition that he would be able to catch the bus is
Answer» A man running with a uniform speed ‘u’ on a straight road observes a stationary bus at a distance ‘d’ ahead of him. At that instant, the bus starts with an acceleration ‘a’. The condition that he would be able to catch the bus is

Discussion

6040.	Which of the following is the right set of primary colours?
Answer» Which of the following is the right set of primary colours?

Discussion

6041.	Due to rapid condensation, it rains suddenly over a small region very heavily. This is known as ___________.
Answer» Due to rapid condensation, it rains suddenly over a small region very heavily. This is known as ___________.

Discussion

6042.	What would happen if you put a balloon in the refrigerator ?
Answer» What would happen if you put a balloon in the refrigerator ?

Discussion

6043.	Instead of seeing our face in plane mirror when we see in transparent glass ,What happens?Does it reflect our face?
Answer» Instead of seeing our face in plane mirror when we see in transparent glass ,What happens?Does it reflect our face?

Discussion

6044.	Why do we say that a plane mirror forms a virtual image of an object?
Answer» Why do we say that a plane mirror forms a virtual image of an object?

Discussion

6045.	Is the pole of concave mirror same as its optical center
Answer» Is the pole of concave mirror same as its optical center

Discussion

6046.	A body goes from C to D with a velocity of 20 m/s and comes back from D to C with a velocity of 30 m/s. The average velocity of the body during the whole journey is:
Answer» A body goes from C to D with a velocity of 20 m/s and comes back from D to C with a velocity of 30 m/s. The average velocity of the body during the whole journey is:

Discussion

6047.	Why is it difficult to drive a bicycle or row a Boat against the wind but easy, in the direction of the Wind?
Answer» Why is it difficult to drive a bicycle or row a Boat against the wind but easy, in the direction of the Wind?

Discussion

6048.	A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and by air is 150km. Calculate the average speed and average velocity of flight and car. The shortest distance between Banglore and Chennai is same as the distance by air. Answer in the given order (in kmhr ): Find the Average speed of Flight, the Average velocity of flight, the Average speed of the car, the Average velocity of the car.
Answer» A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and by air is 150km. Calculate the average speed and average velocity of flight and car. The shortest distance between Banglore and Chennai is same as the distance by air. Answer in the given order (in $\frac{k m}{h r}$ ): Find the Average speed of Flight, the Average velocity of flight, the Average speed of the car, the Average velocity of the car.

6048.

A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and by air is 150km. Calculate the average speed and average velocity of flight and car. The shortest distance between Banglore and Chennai is same as the distance by air. Answer in the given order (in kmhr ): Find the Average speed of Flight, the Average velocity of flight, the Average speed of the car, the Average velocity of the car.

Answer»

A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and by air is 150km. Calculate the average speed and average velocity of flight and car.

The shortest distance between Banglore and Chennai is same as the distance by air.

Answer in the given order (in $\frac{k m}{h r}$ ):

Find the Average speed of Flight, the Average velocity of flight, the Average speed of the car, the Average velocity of the car.

Discussion

6049.	So when we are travelling in a train we see that the moon is moving so is the moon moving but according to the standing person it is not moving so is it moving or not who is correct and how it is said what is the name of the term
Answer» So when we are travelling in a train we see that the moon is moving so is the moon moving but according to the standing person it is not moving so is it moving or not who is correct and how it is said what is the name of the term

Discussion

6050.	What is electicity?
Answer» What is electicity?

Discussion

Explore topic-wise InterviewSolutions in .

The volume of a cube whose edge is 3x units is ______.

A spring balance can be used to measure: A. Mass of an object B. Force acting on an object C. Density of an object D. Weight of an object (a) A and B (b) B and C (c) B and D (d) only D

Two spherical balls A and B made of the same material, are heated to the same temperature. They are then placed in identical surroundings. If the diameter of A is twice that of B, the ratio of rates of cooling of A and B will be

What is density

If a barometer is kept on the earth's surface then calculate the height of the barometer column h. Atmospheric Pressure (Pa) is 105. The density of mercury (ρm) is 13600 kg m−3. Gravitational acceleration (g) near earth's surface is 10 m s−2.

Magnetic material that can be strongly magnetized are known as ______ substances.

The loudness of the sound is measured in ___ .

Question 11 Avinash can run with a speed of 8 ms−1 against the frictional force of 10 N, and Kapil can move with a speed of 3 ms−1 against the frictional force of 25 N. Who is more powerful and why?

A body floats or sinks in a liquid depends on the difference in their:

The same amount of current flows through the connecting wires and the bulb filament. However, it is only the filament that glows. Why?

When you want to illuminate a larger area then which type of reflection you will choose?

From 10:00 PM to 11:00 PM, a person drove at 40 km/h and from 11:00 PM to 12 midnight at 50 km/h. What is his average speed in the time interval 10 PM to 12 AM?

Explain heat capacity.

Planets revolve around the Sun in a definite path. The definite path is known as:

The sound travels fastest in ______.

'X' is the mode of transmission of heat that takes place by the movement of hot particles. Identify 'X'.

At what temperature is the Celsius and Fahrenheit equal, if the relation between Celsius and Fahrenheit is F−329=C5

What is kinetic friction?

Question 11 An electrician is carrying out some repairs in your house. He wants to replace a fuse with a piece of wire. Would you agree? Give reasons for your response.

Question 13 A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

Find the area of the figure given below.

How water carry electricity?

The center of the cyclone is known as:

Which of these diagrams correctly shows how a ray of light gets reflected?

Which of the following statements is correct?

Name the general mode of heat transfer in [2 MARKS] a) Solids b) Liquids and gases.

Why are the electric wires used in homes usually covered with materials like plastic or rubber?

When a liquid starts to boil its temperature remains ___ .

What are furlongs?

Some models of room heaters have a fan blowing air,instead of having a heating coil and a relector. Do you think this could be an advantage ? What mode of heat transfer is used while blowing air in the above heater ?

Two children are moving on two skateboards at the same speed, child A has a mass of 20 kg whereas child B has 30 kg mass. Which child has higher kinetic energy?

What is conduction? How is conduction different from radiation? [2 MARKS]

How fast should a man weighing 600N needs to run, so that his kinetic energy is 750J? Take g=10ms−2

Mercury thermometers are increasingly being replaced by digital thermometers. Which of the following is a correct reason for this?

The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical Surroundings are the same if

A man running with a uniform speed ‘u’ on a straight road observes a stationary bus at a distance ‘d’ ahead of him. At that instant, the bus starts with an acceleration ‘a’. The condition that he would be able to catch the bus is

Which of the following is the right set of primary colours?

Due to rapid condensation, it rains suddenly over a small region very heavily. This is known as ___________.

What would happen if you put a balloon in the refrigerator ?

Instead of seeing our face in plane mirror when we see in transparent glass ,What happens?Does it reflect our face?

Why do we say that a plane mirror forms a virtual image of an object?

Is the pole of concave mirror same as its optical center

A body goes from C to D with a velocity of 20 m/s and comes back from D to C with a velocity of 30 m/s. The average velocity of the body during the whole journey is:

Why is it difficult to drive a bicycle or row a Boat against the wind but easy, in the direction of the Wind?

So when we are travelling in a train we see that the moon is moving so is the moon moving but according to the standing person it is not moving so is it moving or not who is correct and how it is said what is the name of the term

What is electicity?