9478 + Interview Questions in Physics Page 143 InterviewSolution

7101.	If energy is conserved i.e. it is neither created nor destroyed, why do we need to conserve energy?
Answer» If energy is conserved i.e. it is neither created nor destroyed, why do we need to conserve energy?

Discussion

7102.	Why doesn't lightning strike tall buildings like the kutub minar and if it does then why does it not affect the building
Answer» Why doesn't lightning strike tall buildings like the kutub minar and if it does then why does it not affect the building

Discussion

7103.	What is focal lenght?
Answer» What is focal lenght?

Discussion

7104.	What are harmonics?
Answer» What are harmonics?

Discussion

7105.	Assuming the density of air to be 1.295kg/m3, find the fall in the barometric height in mm of Hg at a height of 107 m above sea level. Take density of mercury = 13.6×103kg/m3.
Answer» Assuming the density of air to be $1.295 k g / m^{3}$ , find the fall in the barometric height in mm of Hg at a height of 107 m above sea level. Take density of mercury = $13.6 \times 10^{3} k g / m^{3}$ .

Discussion

7106.	Joseph Priestley performed an experiment in which __________ was heated by focusing Sun’s rays on it using a convex lens.
Answer» Joseph Priestley performed an experiment in which __________ was heated by focusing Sun’s rays on it using a convex lens.

Discussion

7107.	Heat flows from an object of ____ temperature to an object of ____ temperature.
Answer» Heat flows from an object of ____ temperature to an object of ____ temperature.

Discussion

7108.	What do you understand by the term spectrum ? Name the various colours present in the spectrum of sunlight.
Answer» What do you understand by the term spectrum ? Name the various colours present in the spectrum of sunlight.

Discussion

7109.	Explain why, an owl can see well in the night (but not during the day) whereas an eagle can see well during day (but not at night ).
Answer» Explain why, an owl can see well in the night (but not during the day) whereas an eagle can see well during day (but not at night ).

Discussion

7110.	Why do heavy tanks have broad chains called caterpillar tracks
Answer» Why do heavy tanks have broad chains called caterpillar tracks

Discussion

7111.	Identify the reason for the formation of lightning in a thunderstorm.
Answer» Identify the reason for the formation of lightning in a thunderstorm.

Discussion

7112.	A concave mirror is known as _____mirror.
Answer» A concave mirror is known as _____mirror.

Discussion

7113.	The phase transition in which a liquid turns into a solid, when its temperature is lowered below its freezing point, is called as _________.
Answer» The phase transition in which a liquid turns into a solid, when its temperature is lowered below its freezing point, is called as _________.

Discussion

7114.	Dear sir/Ma'am I have a problem in solving this question Q. Describe an activity to show that the incident Ray, the reflected ray and the normal at the point of incidence lie in the same plane.
Answer» Dear sir/Ma'am I have a problem in solving this question Q. Describe an activity to show that the incident Ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Discussion

7115.	If a line is rotated by an angle of 60∘ in the clockwise direcion, by how much angle will its image rotate during reflection?
Answer» If a line is rotated by an angle of $60^{\circ}$ in the clockwise direcion, by how much angle will its image rotate during reflection?

Discussion

7116.	A force of 50N is applied normally on a surface of area of 2m2. Compute the pressure being applied on the area.
Answer» A force of 50N is applied normally on a surface of area of $2 m^{2}$ . Compute the pressure being applied on the area.

Discussion

7117.	A body is pulled from opposite side with equal to 50N and 60N . What will be the resultant force .Mention its possible direction also?
Answer» A body is pulled from opposite side with equal to 50N and 60N . What will be the resultant force .Mention its possible direction also?

Discussion

7118.	What happens to net force if two forces are applied on an object in the same direction ?
Answer» What happens to net force if two forces are applied on an object in the same direction ?

Discussion

7119.	Why are grooves provided in the soles of shoes ?
Answer» Why are grooves provided in the soles of shoes ?

Discussion

7120.	Why does a moving ball slow down on the surface of Earth? [1 MARK]
Answer» Why does a moving ball slow down on the surface of Earth? [1 MARK]

Discussion

7121.	A ball is rolled along a table. What all forces are acting on the ball, after it leaves the table but before it hits the floor?
Answer» A ball is rolled along a table. What all forces are acting on the ball, after it leaves the table but before it hits the floor?

Discussion

7122.	Calculate the pressure at a depth of 100m below the surface of the sea. The density of sea water is 1024kgm3.
Answer» Calculate the pressure at a depth of $100 m$ below the surface of the sea. The density of sea water is $1024 \frac{k g}{m^{3}}$ .

Discussion

7123.	An insulator which is placed between the two plates of capacitor is called ___.
Answer» An insulator which is placed between the two plates of capacitor is called ___.

Discussion

7124.	if two baloons are rubbed together. will they attract or repel
Answer» if two baloons are rubbed together. will they attract or repel

Discussion

7125.	Explain why objects moving in fluids must have a special shape ?
Answer» Explain why objects moving in fluids must have a special shape ?

Discussion

7126.	Why is the loudness of sound heard by a plucked wire increased when mounted on a sound board ?
Answer» Why is the loudness of sound heard by a plucked wire increased when mounted on a sound board ?

Discussion

7127.	Which principle of work is applied to a machine?
Answer» Which principle of work is applied to a machine?

Discussion

7128.	A device which works on the reflection of light from two plane mirrors arranged parallel to one another is: (a) electroscope (b) kaleidoscope (c) periscope (d) stethoscope
Answer» A device which works on the reflection of light from two plane mirrors arranged parallel to one another is: (a) electroscope (b) kaleidoscope (c) periscope (d) stethoscope

7128.

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is: (a) electroscope (b) kaleidoscope (c) periscope (d) stethoscope

Answer»

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is:

(a) electroscope

(b) kaleidoscope

(c) periscope

(d) stethoscope

Discussion

7129.	What is the ratio of electrostatic force and gravitational force between a proton and electron at 1 mm distance? Mass of proton – 1.67×10−27kg Mass of electron – 9.11×10−31kg Charge of electron – 1.6×10−19C
Answer» What is the ratio of electrostatic force and gravitational force between a proton and electron at 1 mm distance? Mass of proton – $1.67 \times 10^{- 27} k g$ Mass of electron – $9.11 \times 10^{- 31} k g$ Charge of electron – $1.6 \times 10^{- 19} C$

7129.

What is the ratio of electrostatic force and gravitational force between a proton and electron at 1 mm distance? Mass of proton – 1.67×10−27kg Mass of electron – 9.11×10−31kg Charge of electron – 1.6×10−19C

Answer»

What is the ratio of electrostatic force and gravitational force between a proton and electron at 1 mm distance?

Mass of proton – $1.67 \times 10^{- 27} k g$

Mass of electron – $9.11 \times 10^{- 31} k g$

Charge of electron – $1.6 \times 10^{- 19} C$

Discussion

7130.	Rohan wants to coat his magic stick made of carbon with copper. He takes a battery, a container filled half with copper sulphate solution, a copper plate and his magic stick. But he is confused about which terminal of the battery to be connected to the copper plate and which terminal to his magic stick. What should he do?
Answer» Rohan wants to coat his magic stick made of carbon with copper. He takes a battery, a container filled half with copper sulphate solution, a copper plate and his magic stick. But he is confused about which terminal of the battery to be connected to the copper plate and which terminal to his magic stick. What should he do?

Discussion

7131.	Which of the following can occur as a result of an earthquake?
Answer» Which of the following can occur as a result of an earthquake?

Discussion

7132.	List some planets on which life can exist?(not earth)
Answer» List some planets on which life can exist?(not earth)

Discussion

7133.	I was told that a star that I am seeing today would have died long back. Then how am I able to still see it? It will not be possible? If it is, then why?
Answer» I was told that a star that I am seeing today would have died long back. Then how am I able to still see it? It will not be possible? If it is, then why?

Discussion

7134.	Evaporation takes place from:
Answer» Evaporation takes place from:

Discussion

7135.	How will you demonstrate by an experiment that a liquid exerts pressure sideways also
Answer» How will you demonstrate by an experiment that a liquid exerts pressure sideways also

Discussion

7136.	Does friction exist between air and an object?
Answer» Does friction exist between air and an object?

Discussion

7137.	The charge of alpha particles is ___:
Answer» The charge of alpha particles is ___:

Discussion

7138.	Is force applied in isolation?
Answer» Is force applied in isolation?

Discussion

7139.	If we apply oil to door hinges, friction will _____.
Answer» If we apply oil to door hinges, friction will _____.

Discussion

7140.	Question 83 State whether the following statement is true or false: Cube roots of 8 are + 2 and - 2
Answer» Question 83 State whether the following statement is true or false: Cube roots of 8 are + 2 and - 2

7140.

Question 83 State whether the following statement is true or false: Cube roots of 8 are + 2 and - 2

Answer»

Question 83

State whether the following statement is true or false:

Cube roots of 8 are + 2 and - 2

Discussion

7141.	Which of the following are forms of mechanical energy? (Select all that apply)
Answer» Which of the following are forms of mechanical energy? (Select all that apply)

Discussion

7142.	Why is sliding friction less than static friction? [3 MARKS]
Answer» Why is sliding friction less than static friction? [3 MARKS]

Discussion

7143.	What is visible light?
Answer» What is visible light?

Discussion

7144.	Which of the following cannot be charged by friction, if held by hand ? (a) a plastic scale (b) a copper rod (c) an onflated balloon (d) a woollen cloth
Answer» Which of the following cannot be charged by friction, if held by hand ? (a) a plastic scale (b) a copper rod (c) an onflated balloon (d) a woollen cloth

7144.

Which of the following cannot be charged by friction, if held by hand ? (a) a plastic scale (b) a copper rod (c) an onflated balloon (d) a woollen cloth

Answer»

Which of the following cannot be charged by friction, if held by hand ?

(a) a plastic scale (b) a copper rod (c) an onflated balloon (d) a woollen cloth

Discussion

7145.	What name is given to the phenomenon in which the earth shakes suddenly for a very short time?
Answer» What name is given to the phenomenon in which the earth shakes suddenly for a very short time?

Discussion

7146.	Are these two forces equal ? [1 MARK]
Answer» Are these two forces equal ? [1 MARK]

7146.

Are these two forces equal ? [1 MARK]

Answer»

Are these two forces equal ? [1 MARK]

Discussion

7147.	A 6 V battery is connected across a lamp whose resistance is 20 Ω. Calculate the value of the extra resistance in Ω which must be used in the circuit to get 0.25 A current in the circuit.
Answer» A 6 V battery is connected across a lamp whose resistance is 20 $Ω$ . Calculate the value of the extra resistance in $Ω$ which must be used in the circuit to get 0.25 A current in the circuit.

Discussion

7148.	Two bodies A and B (A bigger than B) are rubbed together. Which of the following statement is true:
Answer» Two bodies A and B (A bigger than B) are rubbed together. Which of the following statement is true:

Discussion

7149.	Uniform circular motion is called continuously accelerated motion because
Answer» Uniform circular motion is called continuously accelerated motion because

Discussion

7150.	What are rods and cones in the retina of an eye?
Answer» What are rods and cones in the retina of an eye?

Discussion

Explore topic-wise InterviewSolutions in .

If energy is conserved i.e. it is neither created nor destroyed, why do we need to conserve energy?

Why doesn't lightning strike tall buildings like the kutub minar and if it does then why does it not affect the building

What is focal lenght?

What are harmonics?

Assuming the density of air to be 1.295kg/m3, find the fall in the barometric height in mm of Hg at a height of 107 m above sea level. Take density of mercury = 13.6×103kg/m3.

Joseph Priestley performed an experiment in which __________ was heated by focusing Sun’s rays on it using a convex lens.

Heat flows from an object of ____ temperature to an object of ____ temperature.

What do you understand by the term spectrum ? Name the various colours present in the spectrum of sunlight.

Explain why, an owl can see well in the night (but not during the day) whereas an eagle can see well during day (but not at night ).

Why do heavy tanks have broad chains called caterpillar tracks

Identify the reason for the formation of lightning in a thunderstorm.

A concave mirror is known as _____mirror.

The phase transition in which a liquid turns into a solid, when its temperature is lowered below its freezing point, is called as _________.

Dear sir/Ma'am I have a problem in solving this question Q. Describe an activity to show that the incident Ray, the reflected ray and the normal at the point of incidence lie in the same plane.

If a line is rotated by an angle of 60∘ in the clockwise direcion, by how much angle will its image rotate during reflection?

A force of 50N is applied normally on a surface of area of 2m2. Compute the pressure being applied on the area.

A body is pulled from opposite side with equal to 50N and 60N . What will be the resultant force .Mention its possible direction also?

What happens to net force if two forces are applied on an object in the same direction ?

Why are grooves provided in the soles of shoes ?

Why does a moving ball slow down on the surface of Earth? [1 MARK]

A ball is rolled along a table. What all forces are acting on the ball, after it leaves the table but before it hits the floor?

Calculate the pressure at a depth of 100m below the surface of the sea. The density of sea water is 1024kgm3.

An insulator which is placed between the two plates of capacitor is called ___.

if two baloons are rubbed together. will they attract or repel

Explain why objects moving in fluids must have a special shape ?

Why is the loudness of sound heard by a plucked wire increased when mounted on a sound board ?

Which principle of work is applied to a machine?

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is: (a) electroscope (b) kaleidoscope (c) periscope (d) stethoscope

What is the ratio of electrostatic force and gravitational force between a proton and electron at 1 mm distance? Mass of proton – 1.67×10−27kg Mass of electron – 9.11×10−31kg Charge of electron – 1.6×10−19C

Which of the following can occur as a result of an earthquake?

List some planets on which life can exist?(not earth)

I was told that a star that I am seeing today would have died long back. Then how am I able to still see it? It will not be possible? If it is, then why?

Evaporation takes place from:

How will you demonstrate by an experiment that a liquid exerts pressure sideways also

Does friction exist between air and an object?

The charge of alpha particles is ___:

Is force applied in isolation?

If we apply oil to door hinges, friction will _____.

Question 83 State whether the following statement is true or false: Cube roots of 8 are + 2 and - 2

Which of the following are forms of mechanical energy? (Select all that apply)

Why is sliding friction less than static friction? [3 MARKS]

What is visible light?

Which of the following cannot be charged by friction, if held by hand ? (a) a plastic scale (b) a copper rod (c) an onflated balloon (d) a woollen cloth

What name is given to the phenomenon in which the earth shakes suddenly for a very short time?

Are these two forces equal ? [1 MARK]

A 6 V battery is connected across a lamp whose resistance is 20 Ω. Calculate the value of the extra resistance in Ω which must be used in the circuit to get 0.25 A current in the circuit.

Two bodies A and B (A bigger than B) are rubbed together. Which of the following statement is true:

Uniform circular motion is called continuously accelerated motion because

What are rods and cones in the retina of an eye?

Heat flows from an object of temperature to an object of temperature.