9478 + Interview Questions in Physics Page 178 InterviewSolution

8851.	How can we calculate the energy when power and time are given?
Answer» How can we calculate the energy when power and time are given?

Discussion

8852.	Electroplating is a proces in which:
Answer» Electroplating is a proces in which:

Discussion

8853.	Write the full form of dB.
Answer» Write the full form of dB.

Discussion

8854.	Suppose you are outside your home and an earthquake strikes. Which of the following would you never do if you want to protect yourself?
Answer» Suppose you are outside your home and an earthquake strikes. Which of the following would you never do if you want to protect yourself?

Discussion

8855.	Mr. Smith left his house at 7:30 a.m and drove at a rate of 50 mph until 10:00a.m He than stopped for half an hour . At what rate must he travel in order to get to work by noon if he still has 105 miles to go
Answer» Mr. Smith left his house at 7:30 a.m and drove at a rate of 50 mph until 10:00a.m He than stopped for half an hour . At what rate must he travel in order to get to work by noon if he still has 105 miles to go

Discussion

8856.	What happens to the weight of a body when it is immersed in a liquid.
Answer» What happens to the weight of a body when it is immersed in a liquid.

Discussion

8857.	Let mixture be prepared by mixing nA of liquid A and nB moles of liquid B. Let PA and PB be the partial pressures of two constituents and P∘A and P∘B are the vapour pressures in pure state. PT is the total pressure. Which of the following relations are true?
Answer» Let mixture be prepared by mixing $n_{A}$ of liquid A and $n_{B}$ moles of liquid B. Let $P_{A}$ and $P_{B}$ be the partial pressures of two constituents and $P_{A}^{\circ}$ and $P_{B}^{\circ}$ are the vapour pressures in pure state. P_T is the total pressure. Which of the following relations are true?

Discussion

8858.	In the given figure if the mirror is rotated by an angle θ in the clockwise direction. Then the angle of incident becomes equal to:
Answer» In the given figure if the mirror is rotated by an angle $θ$ in the clockwise direction. Then the angle of incident becomes equal to:

8858.

In the given figure if the mirror is rotated by an angle θ in the clockwise direction. Then the angle of incident becomes equal to:

Answer»

In the given figure if the mirror is rotated by an angle $θ$ in the clockwise direction. Then the angle of incident becomes equal to:

Discussion

8859.	1 m/s = ____ km/hr
Answer» 1 $m / s$ = ____ $k m / h r$

Discussion

8860.	Explain the terms vaporization and boiling point.
Answer» Explain the terms vaporization and boiling point.

Discussion

8861.	Why does a glass slip when you hold it with oily hand?
Answer» Why does a glass slip when you hold it with oily hand?

Discussion

8862.	What are comets
Answer» What are comets

Discussion

8863.	The stars appear to twinkle. Give reason.
Answer» The stars appear to twinkle. Give reason.

Discussion

8864.	A bird makes a sound that is:
Answer» A bird makes a sound that is:

Discussion

8865.	Sodium is a ___ of electricity while pure water is ___ of electricity.
Answer» Sodium is a ___ of electricity while pure water is ___ of electricity.

Discussion

8866.	When a body is lying on a rough inclined plane and does not move, the force of friction
Answer» When a body is lying on a rough inclined plane and does not move, the force of friction

Discussion

8867.	Force of friction is directly proportional to
Answer» Force of friction is directly proportional to

Discussion

8868.	On applying a force, a block starts sliding on a fixed rough horizontal surface as shown below. What is the direction of frictional force acting on it?
Answer» On applying a force, a block starts sliding on a fixed rough horizontal surface as shown below. What is the direction of frictional force acting on it?

8868.

On applying a force, a block starts sliding on a fixed rough horizontal surface as shown below. What is the direction of frictional force acting on it?

Answer»

On applying a force, a block starts sliding on a fixed rough horizontal surface as shown below. What is the direction of frictional force acting on it?

Discussion

8869.	When a glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene there is an attraction between the two. Identify the charge on the plastic straw.
Answer» When a glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene there is an attraction between the two. Identify the charge on the plastic straw.

Discussion

8870.	A liquid can change into vapour state (a) at a fixed temperature, and (b) at all temperatures Name the processes involved in the two cases.
Answer» A liquid can change into vapour state (a) at a fixed temperature, and (b) at all temperatures Name the processes involved in the two cases.

8870.

A liquid can change into vapour state (a) at a fixed temperature, and (b) at all temperatures Name the processes involved in the two cases.

Answer»

A liquid can change into vapour state

(a) at a fixed temperature, and

(b) at all temperatures

Name the processes involved in the two cases.

Discussion

8871.	What can be the minimum distance between an object and its image formed by a concave mirror? ( f is the focal length of the mirror)
Answer» What can be the minimum distance between an object and its image formed by a concave mirror? ( $f$ is the focal length of the mirror)

Discussion

8872.	Which plastic is obtained from CHCI3 as follows
Answer» Which plastic is obtained from CHCI₃ as follows

8872.

Which plastic is obtained from CHCI3 as follows

Answer»

Which plastic is obtained from CHCI₃ as follows

Discussion

8873.	Statement 1: Meteors are known as shooting stars, although they are not stars. Statement 2: Meteors are small objects, which enter the earth's atmosphere at high speed, heat up due to friction, glow and then evaporate quickly.
Answer» Statement 1: Meteors are known as shooting stars, although they are not stars. Statement 2: Meteors are small objects, which enter the earth's atmosphere at high speed, heat up due to friction, glow and then evaporate quickly.

8873.

Statement 1: Meteors are known as shooting stars, although they are not stars. Statement 2: Meteors are small objects, which enter the earth's atmosphere at high speed, heat up due to friction, glow and then evaporate quickly.

Answer»

Statement 1: Meteors are known as shooting stars, although they are not stars.

Statement 2: Meteors are small objects, which enter the earth's atmosphere at high speed, heat up due to friction, glow and then evaporate quickly.

Discussion

8874.	A ship floats with 13rd of its volume outside. when its in water. When it floats in another liquid, 23rd of its volume is outside the liquid. What is the relative density of the liquid?
Answer» A ship floats with ${\frac{1}{3}}^{r d}$ of its volume outside. when its in water. When it floats in another liquid, ${\frac{2}{3}}^{r d}$ of its volume is outside the liquid. What is the relative density of the liquid?

Discussion

8875.	What is responsible for heating the water at the surface of the ocean more than the water at the depth?
Answer» What is responsible for heating the water at the surface of the ocean more than the water at the depth?

Discussion

8876.	What is the percentage change in length of 1m iron rod if the temperature change by 100∘C (Assume coefficient of linear expansion, α=2×10−5∘C−1)
Answer» What is the percentage change in length of $1 m$ iron rod if the temperature change by $100^{\circ} C$ (Assume coefficient of linear expansion, $α = 2 \times 10^{- 5}^{\circ} C^{- 1}$ )

Discussion

8877.	Vocal cords are found in ______________.
Answer» Vocal cords are found in ______________.

Discussion

8878.	(a) What is meant by noise pollution? Mention some of the sources of noise pollution in your surroundings. (b) Explain how noise pollution (or excessive loud noise) is harmful to human beings. (c) State the various measures which can be taken to control (or reduce) noise pollution in our surroundings. (d) What can be done along the roads to reduce noise pollution caused by traffic from reaching the residents of the area?
Answer» (a) What is meant by noise pollution? Mention some of the sources of noise pollution in your surroundings. (b) Explain how noise pollution (or excessive loud noise) is harmful to human beings. (c) State the various measures which can be taken to control (or reduce) noise pollution in our surroundings. (d) What can be done along the roads to reduce noise pollution caused by traffic from reaching the residents of the area?

8878.

(a) What is meant by noise pollution? Mention some of the sources of noise pollution in your surroundings. (b) Explain how noise pollution (or excessive loud noise) is harmful to human beings. (c) State the various measures which can be taken to control (or reduce) noise pollution in our surroundings. (d) What can be done along the roads to reduce noise pollution caused by traffic from reaching the residents of the area?

Answer»

(a) What is meant by noise pollution? Mention some of the sources of noise pollution in your surroundings.

(b) Explain how noise pollution (or excessive loud noise) is harmful to human beings.

(c) State the various measures which can be taken to control (or reduce) noise pollution in our surroundings.

(d) What can be done along the roads to reduce noise pollution caused by traffic from reaching the residents of the area?

Discussion

8879.	When we try to push a very heavy box kept on the ground, it does not move at all. Which force is preventing this box to move forward? Where does this force act?
Answer» When we try to push a very heavy box kept on the ground, it does not move at all. Which force is preventing this box to move forward? Where does this force act?

Discussion

8880.	If the static friction between two surfaces P and Q is measured to be 50N, then the rolling friction between these two surfaces should most likely to be: (a) 75N (b) 45N (c) 55N (d) 65N
Answer» If the static friction between two surfaces P and Q is measured to be 50N, then the rolling friction between these two surfaces should most likely to be: (a) 75N (b) 45N (c) 55N (d) 65N

Discussion

8881.	What happens when two moving plates of earth's crust collide head on with each other ?
Answer» What happens when two moving plates of earth's crust collide head on with each other ?

Discussion

8882.	Two magnetic field lines can not intersect each other because
Answer» Two magnetic field lines can not intersect each other because

Discussion

8883.	Question 2 In the circuit shown in Fig., when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of the hammer? (a) gravitational force alone (b) electrostatic force alone (c) magnetic force alone (d) frictional force alone
Answer» Question 2 In the circuit shown in Fig., when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of the hammer? (a) gravitational force alone (b) electrostatic force alone (c) magnetic force alone (d) frictional force alone

Discussion

8884.	why don't the metal comb get charged when we rub them
Answer» why don't the metal comb get charged when we rub them

Discussion

8885.	A train is going north, what is the direction of friction on it?
Answer» A train is going north, what is the direction of friction on it?

Discussion

8886.	Which of the following is an example of vector quantity?
Answer» Which of the following is an example of vector quantity?

Discussion

8887.	Question 8 The outermost layer of the earth is called (a) mantle (b) outer core (c) crust (d) inner core
Answer» Question 8 The outermost layer of the earth is called (a) mantle (b) outer core (c) crust (d) inner core

8887.

Question 8 The outermost layer of the earth is called (a) mantle (b) outer core (c) crust (d) inner core

Answer»

Question 8

The outermost layer of the earth is called
(a) mantle
(b) outer core
(c) crust
(d) inner core

Discussion

8888.	State the number of images of an object placed between the two plane mirrors, formed in each case when the mirrors inclined to each other at (a) 90∘ and (b)60∘.
Answer» State the number of images of an object placed between the two plane mirrors, formed in each case when the mirrors inclined to each other at (a) $90^{\circ} a n d (b) 60^{\circ}$ .

8888.

State the number of images of an object placed between the two plane mirrors, formed in each case when the mirrors inclined to each other at (a) 90∘ and (b)60∘.

Answer»

State the number of images of an object placed between the two plane mirrors, formed in each case when the mirrors inclined to each other at

(a) $90^{\circ} a n d (b) 60^{\circ}$ .

Discussion

8889.	On the Celsius scale, the absolute zero of temperature is at ______.
Answer» On the Celsius scale, the absolute zero of temperature is at ______.

Discussion

8890.	Which of the following metals cannot be electroplated on the surface of another metal using an aqueous electrolyte?
Answer» Which of the following metals cannot be electroplated on the surface of another metal using an aqueous electrolyte?

Discussion

8891.	Difference between buoyant force and thrust .
Answer» Difference between buoyant force and thrust .

Discussion

8892.	The back and forth vibration of a metal strip in air _____.
Answer» The back and forth vibration of a metal strip in air _____.

Discussion

8893.	Two fans rated (60w 220v) & (60w, 110v). Calculate their resistance and current passing in bulbs.
Answer» Two fans rated (60w 220v) & (60w, 110v). Calculate their resistance and current passing in bulbs.

Discussion

8894.	How does an applied force change the speed of an object
Answer» How does an applied force change the speed of an object

Discussion

8895.	What is the minimum distance an ant has to travel from point A to B (along the walls only) as shown in the figure?
Answer» What is the minimum distance an ant has to travel from point A to B (along the walls only) as shown in the figure?

8895.

What is the minimum distance an ant has to travel from point A to B (along the walls only) as shown in the figure?

Answer»

What is the minimum distance an ant has to travel from point A to B (along the walls only) as shown in the figure?

Discussion

8896.	(a) Derive the mathematical relation between refractive indices n1 and n2 of two media and radius of curvature R for refraction at a convex spherical surface. Consider the object to be a point since lying on the principle axis in rarer medium of refractive index n1 and a real image formed in the denser medium of refractive index n2. Hence, derive Lens Maker's formula. (b) Light from a point source in air falls on a convex spherical glass surface of refractive index 1.5 and radius of curvature 20 cm. The distance of light source from the glass surface is 100 cm. At what position is the image formed ?
Answer» (a) Derive the mathematical relation between refractive indices $n_{1}$ and $n_{2}$ of two media and radius of curvature R for refraction at a convex spherical surface. Consider the object to be a point since lying on the principle axis in rarer medium of refractive index $n_{1}$ and a real image formed in the denser medium of refractive index $n_{2}$ . Hence, derive Lens Maker's formula. (b) Light from a point source in air falls on a convex spherical glass surface of refractive index 1.5 and radius of curvature 20 cm. The distance of light source from the glass surface is 100 cm. At what position is the image formed ?

Discussion

8897.	In an experiment, a charged object attracts another charged object. What can be understood from this?
Answer» In an experiment, a charged object attracts another charged object. What can be understood from this?

Discussion

8898.	While inflating a balloon, the entire air that was blown into the balloon escapes from it when its mouth is left open. This is because:
Answer» While inflating a balloon, the entire air that was blown into the balloon escapes from it when its mouth is left open. This is because:

Discussion

8899.	The amount of heat produced in a conductor does not depend on
Answer» The amount of heat produced in a conductor does not depend on

Discussion

8900.	An example of a poor conductor of electricity is
Answer» An example of a poor conductor of electricity is

Discussion

Explore topic-wise InterviewSolutions in .

How can we calculate the energy when power and time are given?

Electroplating is a proces in which:

Write the full form of dB.

Suppose you are outside your home and an earthquake strikes. Which of the following would you never do if you want to protect yourself?

Mr. Smith left his house at 7:30 a.m and drove at a rate of 50 mph until 10:00a.m He than stopped for half an hour . At what rate must he travel in order to get to work by noon if he still has 105 miles to go

What happens to the weight of a body when it is immersed in a liquid.

Let mixture be prepared by mixing nA of liquid A and nB moles of liquid B. Let PA and PB be the partial pressures of two constituents and P∘A and P∘B are the vapour pressures in pure state. PT is the total pressure. Which of the following relations are true?

In the given figure if the mirror is rotated by an angle θ in the clockwise direction. Then the angle of incident becomes equal to:

1 m/s = ____ km/hr

Explain the terms vaporization and boiling point.

Why does a glass slip when you hold it with oily hand?

What are comets

The stars appear to twinkle. Give reason.

A bird makes a sound that is:

Sodium is a ___ of electricity while pure water is ___ of electricity.

When a body is lying on a rough inclined plane and does not move, the force of friction

Force of friction is directly proportional to

On applying a force, a block starts sliding on a fixed rough horizontal surface as shown below. What is the direction of frictional force acting on it?

When a glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene there is an attraction between the two. Identify the charge on the plastic straw.

A liquid can change into vapour state (a) at a fixed temperature, and (b) at all temperatures Name the processes involved in the two cases.

What can be the minimum distance between an object and its image formed by a concave mirror? ( f is the focal length of the mirror)

Which plastic is obtained from CHCI3 as follows

Statement 1: Meteors are known as shooting stars, although they are not stars. Statement 2: Meteors are small objects, which enter the earth's atmosphere at high speed, heat up due to friction, glow and then evaporate quickly.

A ship floats with 13rd of its volume outside. when its in water. When it floats in another liquid, 23rd of its volume is outside the liquid. What is the relative density of the liquid?

What is responsible for heating the water at the surface of the ocean more than the water at the depth?

What is the percentage change in length of 1m iron rod if the temperature change by 100∘C (Assume coefficient of linear expansion, α=2×10−5∘C−1)

Vocal cords are found in ______________.

When we try to push a very heavy box kept on the ground, it does not move at all. Which force is preventing this box to move forward? Where does this force act?

If the static friction between two surfaces P and Q is measured to be 50N, then the rolling friction between these two surfaces should most likely to be: (a) 75N (b) 45N (c) 55N (d) 65N

What happens when two moving plates of earth's crust collide head on with each other ?

Two magnetic field lines can not intersect each other because

Question 2 In the circuit shown in Fig., when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of the hammer? (a) gravitational force alone (b) electrostatic force alone (c) magnetic force alone (d) frictional force alone

why don't the metal comb get charged when we rub them

A train is going north, what is the direction of friction on it?

Which of the following is an example of vector quantity?

Question 8 The outermost layer of the earth is called (a) mantle (b) outer core (c) crust (d) inner core

State the number of images of an object placed between the two plane mirrors, formed in each case when the mirrors inclined to each other at (a) 90∘ and (b)60∘.

On the Celsius scale, the absolute zero of temperature is at ______.

Which of the following metals cannot be electroplated on the surface of another metal using an aqueous electrolyte?

Difference between buoyant force and thrust .

The back and forth vibration of a metal strip in air _____.

Two fans rated (60w 220v) &amp; (60w, 110v). Calculate their resistance and current passing in bulbs.

How does an applied force change the speed of an object

What is the minimum distance an ant has to travel from point A to B (along the walls only) as shown in the figure?

In an experiment, a charged object attracts another charged object. What can be understood from this?

While inflating a balloon, the entire air that was blown into the balloon escapes from it when its mouth is left open. This is because:

The amount of heat produced in a conductor does not depend on

An example of a poor conductor of electricity is

Sodium is a _ of electricity while pure water is _ of electricity.

Two fans rated (60w 220v) & (60w, 110v). Calculate their resistance and current passing in bulbs.