9478 + Interview Questions in Physics Page 124 InterviewSolution

6151.	Consider 2 mirrors arranged at right angle as shown. A ray is incident at an angle of 30∘ to the normal of the mirror 1. What is the angle made by the outgoing ray with the normal of mirror 2? [3 MARKS]
Answer» Consider 2 mirrors arranged at right angle as shown. A ray is incident at an angle of $30^{\circ}$ to the normal of the mirror 1. What is the angle made by the outgoing ray with the normal of mirror 2? [3 MARKS]

6151.

Consider 2 mirrors arranged at right angle as shown. A ray is incident at an angle of 30∘ to the normal of the mirror 1. What is the angle made by the outgoing ray with the normal of mirror 2? [3 MARKS]

Answer»

Consider 2 mirrors arranged at right angle as shown. A ray is incident at an angle of $30^{\circ}$ to the normal of the mirror 1.
What is the angle made by the outgoing ray with the normal of mirror 2? [3 MARKS]

Discussion

6152.	Identify the material noun in the sentence. “The coffee in your cup is getting cold,” said mother.
Answer» Identify the material noun in the sentence. “The coffee in your cup is getting cold,” said mother.

6152.

Identify the material noun in the sentence. “The coffee in your cup is getting cold,” said mother.

Answer»

Identify the material noun in the sentence.

“The coffee in your cup is getting cold,” said mother.

Discussion

6153.	Which of the following unit(s) represents/represent upthrust?
Answer» Which of the following unit(s) represents/represent upthrust?

Discussion

6154.	What is a non contact force? Give some examples of it and explain why they are non-contact forces? [3 MARKS]
Answer» What is a non contact force? Give some examples of it and explain why they are non-contact forces? [3 MARKS]

Discussion

6155.	A ray OA is incident upon a smooth surface POQ. It is reflected back along OB. A normal ON is drawn perpendicular to the surface at O (the point of incidence). The value of ∠AOP is 60∘ . Find the value of the angle of reflection.
Answer» A ray OA is incident upon a smooth surface POQ. It is reflected back along OB. A normal ON is drawn perpendicular to the surface at O (the point of incidence). The value of $∠ A O P$ is $60^{\circ}$ . Find the value of the angle of reflection.

Discussion

6156.	State the unit of thrust.
Answer» State the unit of thrust.

Discussion

6157.	Viscosity arises due to:
Answer» Viscosity arises due to:

Discussion

6158.	Define kilogram force I am not understanding
Answer» Define kilogram force I am not understanding

6158.

Define kilogram force I am not understanding

Answer»

Define kilogram force

I am not understanding

Discussion

6159.	A wooden block is lying on a horizontal table. A 2 N force is applied to the block in horizontal direction, and still the block remains at rest. What is the force of friction offered by the table?
Answer» A wooden block is lying on a horizontal table. A 2 N force is applied to the block in horizontal direction, and still the block remains at rest. What is the force of friction offered by the table?

Discussion

6160.	In the construction of the lightning conductor, give reason for having one end of the rod kept out in the air and the other end buried deep inside. [2 MARKS]
Answer» In the construction of the lightning conductor, give reason for having one end of the rod kept out in the air and the other end buried deep inside. [2 MARKS]

Discussion

6161.	Three liquids with masses m1,m2,m3 are thoroughly mixed, If their specific heats are c1,c2,c3 and their temperatures T1,T2,T3 respectively, then the temperature of the mixture is
Answer» Three liquids with masses $m_{1}, m_{2}, m_{3}$ are thoroughly mixed, If their specific heats are $c_{1}, c_{2}, c_{3}$ and their temperatures $T_{1}, T_{2}, T_{3}$ respectively, then the temperature of the mixture is

Discussion

6162.	How is sound produced in human?
Answer» How is sound produced in human?

Discussion

6163.	Name a machine which is used to change the direction of the force.
Answer» Name a machine which is used to change the direction of the force.

Discussion

6164.	Why is electrical wiring usually made from copper?
Answer» Why is electrical wiring usually made from copper?

Discussion

6165.	What is dispersion of light?
Answer» What is dispersion of light?

Discussion

6166.	I have a container that is 20cm tall and filled fully with water. The lift accelerates up at 10m/s/s. What is the pressure difference between the top surface of the water and the bottom of the container? Take density of water as 1000 kg/m3.
Answer» I have a container that is 20cm tall and filled fully with water. The lift accelerates up at 10m/s/s. What is the pressure difference between the top surface of the water and the bottom of the container? Take density of water as 1000 $k g / m^{3}$ .

Discussion

6167.	Why does the white light split on the first refracting face of prism ?
Answer» Why does the white light split on the first refracting face of prism ?

Discussion

6168.	A car moving with a velocity of 10m/s and with a uniform acceleration gains a velocity of 30m/s after traveling a distance of 4km then time taken is
Answer» A car moving with a velocity of 10m/s and with a uniform acceleration gains a velocity of 30m/s after traveling a distance of 4km then time taken is

Discussion

6169.	As the time period of a wave increases, it's frequency decreases.Why?
Answer» As the time period of a wave increases, it's frequency decreases.Why?

Discussion

6170.	Suppose you are in a dark room. Can you see objects in the room? [3 MARKS]
Answer» Suppose you are in a dark room. Can you see objects in the room? [3 MARKS]

Discussion

6171.	Defination of force?
Answer» Defination of force?

Discussion

6172.	An electron and a proton attracts but why?
Answer» An electron and a proton attracts but why?

Discussion

6173.	What is the audible range of frequency for human beings?
Answer» What is the audible range of frequency for human beings?

Discussion

6174.	A train travels 40 km at a uniform speed of 30kmh−1. Its average speed for the whole journey after travelling another 40 km is 45kmh−1. Its speed in the second half of the journey is ____.
Answer» A train travels 40 km at a uniform speed of $30 k m h^{- 1}$ . Its average speed for the whole journey after travelling another 40 km is $45 k m h^{- 1}$ . Its speed in the second half of the journey is ____.

Discussion

6175.	Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.
Answer» Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.

Discussion

6176.	Following articles are placed in contact with the metallic disc of a positively charged electroscope i) an ebonite rod rubbed with fur ii) a glass rod rubbed with slim iii) a plastic rod not rubbed with anything if) a copper rod
Answer» Following articles are placed in contact with the metallic disc of a positively charged electroscope i) an ebonite rod rubbed with fur ii) a glass rod rubbed with slim iii) a plastic rod not rubbed with anything if) a copper rod

Discussion

6177.	Why Sledges are not provided with wheels?
Answer» Why Sledges are not provided with wheels?

Discussion

6178.	Question 5 Suppose a new planet is discovered between Uranus and Neptune. Its time period would be (a) less than that of Neptune. (b) more than that of Neptune. (c) equal to that of Neptune or Uranus. (d) less than that of Uranus.
Answer» Question 5 Suppose a new planet is discovered between Uranus and Neptune. Its time period would be (a) less than that of Neptune. (b) more than that of Neptune. (c) equal to that of Neptune or Uranus. (d) less than that of Uranus.

Discussion

6179.	If a book placed on a horizontal desk is pushed towards right, what will be the direction of frictional force acting on it?
Answer» If a book placed on a horizontal desk is pushed towards right, what will be the direction of frictional force acting on it?

Discussion

6180.	Question 03.2 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Chalk powder
Answer» Question 03.2 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Chalk powder

Discussion

6181.	The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is: (a) two (b) five (c) one (d) three
Answer» The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is: (a) two (b) five (c) one (d) three

6181.

The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is: (a) two (b) five (c) one (d) three

Answer»

The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is:

(a) two

(b) five

(c) one

(d) three

Discussion

6182.	Splitting of light into its component colours is known as:
Answer» Splitting of light into its component colours is known as:

Discussion

6183.	The loudness of sound is measured in the unit of __________.
Answer» The loudness of sound is measured in the unit of __________.

Discussion

6184.	Question 1 (c) Fill in the blank: Friction produces _________.
Answer» Question 1 (c) Fill in the blank: Friction produces _________.

Discussion

6185.	Which of the following part of the earth is made up of molten iron? (a) mantle (b) inner core (c) outer core (d) crust
Answer» Which of the following part of the earth is made up of molten iron? (a) mantle (b) inner core (c) outer core (d) crust

6185.

Which of the following part of the earth is made up of molten iron? (a) mantle (b) inner core (c) outer core (d) crust

Answer»

Which of the following part of the earth is made up of molten iron?

(a) mantle (b) inner core (c) outer core (d) crust

Discussion

6186.	When electric current is passed through acidified water, then hydrogen and oxygen are formed. What type of effect of current is illustrated by this statement ?
Answer» When electric current is passed through acidified water, then hydrogen and oxygen are formed. What type of effect of current is illustrated by this statement ?

Discussion

6187.	Question 6 (c) Express the following as cm using decimals: 116 mm
Answer» Question 6 (c) Express the following as cm using decimals: 116 mm

6187.

Question 6 (c) Express the following as cm using decimals: 116 mm

Answer»

Question 6 (c)

Express the following as cm using decimals:
116 mm

Discussion

6188.	Out of frequency, wavelength and speed, which quantity/quantities remain constant when a wave travels from one medium to another?
Answer» Out of frequency, wavelength and speed, which quantity/quantities remain constant when a wave travels from one medium to another?

Discussion

6189.	If a person is standing in front of a mirror and his left hand is on the right side and the right hand is on the left side. What kind of mirror he is looking at?
Answer» If a person is standing in front of a mirror and his left hand is on the right side and the right hand is on the left side. What kind of mirror he is looking at?

Discussion

6190.	Name a star having a system of planets with life on one of its planets.
Answer» Name a star having a system of planets with life on one of its planets.

Discussion

6191.	Which of the following objects exerts the most pressure on the floor? (All object have the same mass).
Answer» Which of the following objects exerts the most pressure on the floor? (All object have the same mass).

Discussion

6192.	Define:- a force b pressure
Answer» Define:- a force b pressure

6192.

Define:- a force b pressure

Answer»

Define:-

a force

b pressure

Discussion

6193.	The approximate tilt of Moon's orbit around Earth with respect to Earth's orbit around Sun is __.
Answer» The approximate tilt of Moon's orbit around Earth with respect to Earth's orbit around Sun is __.

Discussion

6194.	Why is chromium plating done on many objects such as car parts, bath taps etc.? Why is steel not preferred as a car part or a bath tap? [ 3 MARKS ]
Answer» Why is chromium plating done on many objects such as car parts, bath taps etc.? Why is steel not preferred as a car part or a bath tap? [ 3 MARKS ]

Discussion

6195.	Porters generally use a cloth cushion on their heads to carry heavy luggage. Why?
Answer» Porters generally use a cloth cushion on their heads to carry heavy luggage. Why?

Discussion

6196.	A light year is the distance travelled by light in one year. How many kilometers does light travel in a year assuming speed of light is 3×108ms−1 ?
Answer» A light year is the distance travelled by light in one year. How many kilometers does light travel in a year assuming speed of light is $3 \times 10^{8} m s^{- 1}$ ?

Discussion

6197.	A skydiver of mass 60 kg is in free-fall. She covers 40 m in two seconds. Calculate the average rate of work done by gravity on the skydiver (take g=10 ms−2).
Answer» A skydiver of mass $60 k g$ is in free-fall. She covers $40 m$ in two seconds. Calculate the average rate of work done by gravity on the skydiver (take $g = 10 m s^{- 2}$ ).

Discussion

6198.	A thrust of 20 N is acting on an area of 2 m2. How much pressure is acting on the surface?
Answer» A thrust of $20 N$ is acting on an area of $2 m^{2}$ . How much pressure is acting on the surface?

Discussion

6199.	What is the difference between mass and density ? How the two objects have same mass even though they differ in density ? Can you explain it detailed ?
Answer» What is the difference between mass and density ? How the two objects have same mass even though they differ in density ? Can you explain it detailed ?

Discussion

6200.	What is meant by atmospheric pressure?
Answer» What is meant by atmospheric pressure?

Discussion

Explore topic-wise InterviewSolutions in .

Consider 2 mirrors arranged at right angle as shown. A ray is incident at an angle of 30∘ to the normal of the mirror 1. What is the angle made by the outgoing ray with the normal of mirror 2? [3 MARKS]

Identify the material noun in the sentence. “The coffee in your cup is getting cold,” said mother.

Which of the following unit(s) represents/represent upthrust?

What is a non contact force? Give some examples of it and explain why they are non-contact forces? [3 MARKS]

A ray OA is incident upon a smooth surface POQ. It is reflected back along OB. A normal ON is drawn perpendicular to the surface at O (the point of incidence). The value of ∠AOP is 60∘ . Find the value of the angle of reflection.

State the unit of thrust.

Viscosity arises due to:

Define kilogram force I am not understanding

A wooden block is lying on a horizontal table. A 2 N force is applied to the block in horizontal direction, and still the block remains at rest. What is the force of friction offered by the table?

In the construction of the lightning conductor, give reason for having one end of the rod kept out in the air and the other end buried deep inside. [2 MARKS]

Three liquids with masses m1,m2,m3 are thoroughly mixed, If their specific heats are c1,c2,c3 and their temperatures T1,T2,T3 respectively, then the temperature of the mixture is

How is sound produced in human?

Name a machine which is used to change the direction of the force.

Why is electrical wiring usually made from copper?

What is dispersion of light?

I have a container that is 20cm tall and filled fully with water. The lift accelerates up at 10m/s/s. What is the pressure difference between the top surface of the water and the bottom of the container? Take density of water as 1000 kg/m3.

Why does the white light split on the first refracting face of prism ?

A car moving with a velocity of 10m/s and with a uniform acceleration gains a velocity of 30m/s after traveling a distance of 4km then time taken is

As the time period of a wave increases, it's frequency decreases.Why?

Suppose you are in a dark room. Can you see objects in the room? [3 MARKS]

Defination of force?

An electron and a proton attracts but why?

What is the audible range of frequency for human beings?

A train travels 40 km at a uniform speed of 30kmh−1. Its average speed for the whole journey after travelling another 40 km is 45kmh−1. Its speed in the second half of the journey is ____.

Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.

Following articles are placed in contact with the metallic disc of a positively charged electroscope i) an ebonite rod rubbed with fur ii) a glass rod rubbed with slim iii) a plastic rod not rubbed with anything if) a copper rod

Why Sledges are not provided with wheels?

Question 5 Suppose a new planet is discovered between Uranus and Neptune. Its time period would be (a) less than that of Neptune. (b) more than that of Neptune. (c) equal to that of Neptune or Uranus. (d) less than that of Uranus.

If a book placed on a horizontal desk is pushed towards right, what will be the direction of frictional force acting on it?

Question 03.2 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Chalk powder

The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is: (a) two (b) five (c) one (d) three

Splitting of light into its component colours is known as:

The loudness of sound is measured in the unit of __________.

Question 1 (c) Fill in the blank: Friction produces _________.

Which of the following part of the earth is made up of molten iron? (a) mantle (b) inner core (c) outer core (d) crust

When electric current is passed through acidified water, then hydrogen and oxygen are formed. What type of effect of current is illustrated by this statement ?

Question 6 (c) Express the following as cm using decimals: 116 mm

Out of frequency, wavelength and speed, which quantity/quantities remain constant when a wave travels from one medium to another?

If a person is standing in front of a mirror and his left hand is on the right side and the right hand is on the left side. What kind of mirror he is looking at?

Name a star having a system of planets with life on one of its planets.

Which of the following objects exerts the most pressure on the floor? (All object have the same mass).

Define:- a force b pressure

The approximate tilt of Moon's orbit around Earth with respect to Earth's orbit around Sun is __.

Why is chromium plating done on many objects such as car parts, bath taps etc.? Why is steel not preferred as a car part or a bath tap? [ 3 MARKS ]

Porters generally use a cloth cushion on their heads to carry heavy luggage. Why?

A light year is the distance travelled by light in one year. How many kilometers does light travel in a year assuming speed of light is 3×108ms−1 ?

A skydiver of mass 60 kg is in free-fall. She covers 40 m in two seconds. Calculate the average rate of work done by gravity on the skydiver (take g=10 ms−2).

A thrust of 20 N is acting on an area of 2 m2. How much pressure is acting on the surface?

What is the difference between mass and density ? How the two objects have same mass even though they differ in density ? Can you explain it detailed ?

What is meant by atmospheric pressure?