13232 + Interview Questions in Physics Page 170 InterviewSolution

8451.	When two spring balances joined at their free ends, are pulled apart, both show the same reading. Explain.
Answer» When two spring balances joined at their free ends, are pulled apart, both show the same reading. Explain.

Discussion

8452.	In convection mode of transfer of heat :
Answer» In convection mode of transfer of heat :

Discussion

8453.	Thrust is a ___ quantity.
Answer» Thrust is a ___ quantity.

Discussion

8454.	Question 12 Gravitational force on the surface of the moon is only 16 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the Earth?
Answer» Question 12 Gravitational force on the surface of the moon is only $\frac{1}{6}$ as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the Earth?

Discussion

8455.	Name the quantity which is measured in (a) kWh (b) kW (c) Wh (d) eV.
Answer» Name the quantity which is measured in (a) kWh (b) kW (c) Wh (d) eV.

8455.

Name the quantity which is measured in (a) kWh (b) kW (c) Wh (d) eV.

Answer»

Name the quantity which is measured in

(a) kWh (b) kW (c) Wh (d) eV.

Discussion

8456.	A snail covers a distance of 100 metres in 50 hours. Calculate the average speed of snail in kmh
Answer» A snail covers a distance of 100 metres in 50 hours. Calculate the average speed of snail in $\frac{k m}{h}$

Discussion

8457.	The method used in SONAR is
Answer» The method used in SONAR is

Discussion

8458.	When a body moves uniformly along a circle, then:
Answer» When a body moves uniformly along a circle, then:

Discussion

8459.	A gun is fired in the air at a distance of 660 m from a person, He hears the sound of the gun after 2 seconds. What is the speed of sound?
Answer» A gun is fired in the air at a distance of 660 m from a person, He hears the sound of the gun after 2 seconds. What is the speed of sound?

Discussion

8460.	From the displacement-time graph of a cyclist, given in the figure, find: (i) the average velocity in the first 4 s, (ii) the displacement from the initial position at the end of 10 s, (iii) the time after which he reaches the starting point.
Answer» From the displacement-time graph of a cyclist, given in the figure, find: (i) the average velocity in the first 4 s, (ii) the displacement from the initial position at the end of 10 s, (iii) the time after which he reaches the starting point.

8460.

From the displacement-time graph of a cyclist, given in the figure, find: (i) the average velocity in the first 4 s, (ii) the displacement from the initial position at the end of 10 s, (iii) the time after which he reaches the starting point.

Answer»

From the displacement-time graph of a cyclist, given in the figure, find:

(i) the average velocity in the first 4 s,

(ii) the displacement from the initial position at the end of 10 s,

(iii) the time after which he reaches the starting point.

Discussion

8461.	A feather is dropped on the moon from a height of 10 m. The acceleration due to gravity on the moon is 1.67 ms2. Determine the time taken by the feather to fall on the surface of the moon.
Answer» A feather is dropped on the moon from a height of 10 m. The acceleration due to gravity on the moon is 1.67 $\frac{m}{s^{2}}$ . Determine the time taken by the feather to fall on the surface of the moon.

Discussion

8462.	Calculate the pressure at a depth of 50 m below sea level. Given: Density of sea water = 1024 kg/m3. And, acceleration due to gravity g=10 m/s2
Answer» Calculate the pressure at a depth of $50 m$ below sea level. Given: Density of sea water = $1024 k g / m^{3}$ . And, acceleration due to gravity $g = 10 m / s^{2}$

8462.

Calculate the pressure at a depth of 50 m below sea level. Given: Density of sea water = 1024 kg/m3. And, acceleration due to gravity g=10 m/s2

Answer»

Calculate the pressure at a depth of $50 m$ below sea level.

Given:
Density of sea water = $1024 k g / m^{3}$ .
And, acceleration due to gravity $g = 10 m / s^{2}$

Discussion

8463.	Can one apply force without motion?
Answer» Can one apply force without motion?

Discussion

8464.	How is the upthrust related to the volume of the body submerged in a liquid ?
Answer» How is the upthrust related to the volume of the body submerged in a liquid ?

Discussion

8465.	A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.
Answer» A force of magnitude $25 N$ acting on a body of mass $2 k g$ increases its kinetic energy from $100 J t o 200 J$ . The displacement of the body during this interval is ___m.

Discussion

8466.	What is the major difference between echo and reverberation?
Answer» What is the major difference between echo and reverberation?

Discussion

8467.	Explain the working principle behind the functional advantage of a pressure cooker.
Answer» Explain the working principle behind the functional advantage of a pressure cooker.

Discussion

8468.	Two quantities A and B have different dimensions. Which mathematical operations given below are physically meaningful?
Answer» Two quantities A and B have different dimensions. Which mathematical operations given below are physically meaningful?

Discussion

8469.	Two balls of the same size but of different materials , rubber and iron are kept on the smooth floor of a moving train. Will the balls start rolling ? If so , in which direction ? Will they move with the same speed ? Give reasons for your answer .
Answer» Two balls of the same size but of different materials , rubber and iron are kept on the smooth floor of a moving train. Will the balls start rolling ? If so , in which direction ? Will they move with the same speed ? Give reasons for your answer .

Discussion

8470.	What is miles and how to convert it into km/hr??
Answer» What is miles and how to convert it into km/hr??

Discussion

8471.	Why do planets move ?
Answer» Why do planets move ?

Discussion

8472.	What are conservative forces ? Explain.
Answer» What are conservative forces ? Explain.

Discussion

8473.	Law of conservation of energy states that
Answer» Law of conservation of energy states that

Discussion

8474.	In vaccum heat is transferred by :
Answer» In vaccum heat is transferred by :

Discussion

8475.	Statement 1: Hypermetropia is corrected by use of convex lens Statement 2: The eye lens has to become thick so that it Hypermetropia (hyperopia) also known as farsightedness is a common type of refractive error where distant objects may be seen more clearly than objects that are near is able to bend light coming from a nearby object even more so as to form image at retina itself which a hypermetropic eye is unable to do so we place an extra convex lens which assists the eye lens in further convergence of light.
Answer» Statement 1: Hypermetropia is corrected by use of convex lens Statement 2: The eye lens has to become thick so that it Hypermetropia (hyperopia) also known as farsightedness is a common type of refractive error where distant objects may be seen more clearly than objects that are near is able to bend light coming from a nearby object even more so as to form image at retina itself which a hypermetropic eye is unable to do so we place an extra convex lens which assists the eye lens in further convergence of light.

8475.

Statement 1: Hypermetropia is corrected by use of convex lens Statement 2: The eye lens has to become thick so that it Hypermetropia (hyperopia) also known as farsightedness is a common type of refractive error where distant objects may be seen more clearly than objects that are near is able to bend light coming from a nearby object even more so as to form image at retina itself which a hypermetropic eye is unable to do so we place an extra convex lens which assists the eye lens in further convergence of light.

Answer»

Statement 1: Hypermetropia is corrected by use of convex lens

Statement 2: The eye lens has to become thick so that it Hypermetropia (hyperopia) also known as farsightedness is a common type of refractive error where distant objects may be seen more clearly than objects that are near is able to bend light coming from a nearby object even more so as to form image at retina itself which a hypermetropic eye is unable to do so we place an extra convex lens which assists the eye lens in further convergence of light.

Discussion

8476.	The near point of a hypermetropic eye is 1 m, what is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)
Answer» The near point of a hypermetropic eye is 1 m, what is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)

Discussion

8477.	Question 7 Area under a v – t graph represents a physical quantity which has the unit (a) m2 (b) m (c) m3 (d) m/s
Answer» Question 7 Area under a v – t graph represents a physical quantity which has the unit (a) $m^{2}$ (b) $m$ (c) $m^{3}$ (d) $m / s$

Discussion

8478.	To move a boat ahead in water, the boatman has to push th ewater backwards by his oar. Explain.
Answer» To move a boat ahead in water, the boatman has to push th ewater backwards by his oar. Explain.

Discussion

8479.	In the kinetic theory of gases, it is assumed that molecular collisions are :-
Answer» In the kinetic theory of gases, it is assumed that molecular collisions are :-

Discussion

8480.	Why is the solar cooker painted black from inside?
Answer» Why is the solar cooker painted black from inside?

Discussion

8481.	Conducting wire of uniform cross sectional area 2 cm2 and length 1 cm carries a current of 8 A and has a potential difference of 2 V. The resistivity of the material of the wire is:
Answer» Conducting wire of uniform cross sectional area $2 c m^{2}$ and length $1 c m$ carries a current of $8 A$ and has a potential difference of $2 V$ . The resistivity of the material of the wire is:

Discussion

8482.	How is multiple reflections helpful to doctors and engineers.
Answer» How is multiple reflections helpful to doctors and engineers.

Discussion

8483.	The liquids shown in the figure in the two arms are mercury (specific gravity = 13.6) and water. if the difference of heights of the mercury columns is 2 cm, find the height h of the water column. Acceleration due to gravity g = 10 m/s2
Answer» The liquids shown in the figure in the two arms are mercury (specific gravity = 13.6) and water. if the difference of heights of the mercury columns is 2 cm, find the height h of the water column. Acceleration due to gravity $g = 10 m / s^{2}$

8483.

The liquids shown in the figure in the two arms are mercury (specific gravity = 13.6) and water. if the difference of heights of the mercury columns is 2 cm, find the height h of the water column. Acceleration due to gravity g = 10 m/s2

Answer»

The liquids shown in the figure in the two arms are mercury (specific gravity = 13.6) and water. if the difference of heights of the mercury columns is 2 cm, find the height h of the water column. Acceleration due to gravity $g = 10 m / s^{2}$

Discussion

8484.	Are constellations members of our solar system?
Answer» Are constellations members of our solar system?

Discussion

8485.	Two stars emit maximum radiation at wavelength 3600˙A and 4800˙A respectively. The ratio of their temperatures is
Answer» Two stars emit maximum radiation at wavelength $3600 ˙ A$ and $4800 ˙ A$ respectively. The ratio of their temperatures is

Discussion

8486.	Why does the body of a deep sea fish burst on bringing her above the sea level?
Answer» Why does the body of a deep sea fish burst on bringing her above the sea level?

Discussion

8487.	A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is
Answer» A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is

Discussion

8488.	A line makes an angle of θ x-axis. What is the slope of the line?
Answer» A line makes an angle of $θ$ x-axis. What is the slope of the line?

Discussion

8489.	A solid of density 900 kg/m3 floats in oil as shown in the given diagram. The oil floats on water of density 1000 kg/m3 as shown. The density of oil in kg/m3 could be : (a) 850 (b) 900 (c) 950 (d) 1050
Answer» A solid of density $900 k g / m^{3}$ floats in oil as shown in the given diagram. The oil floats on water of density $1000 k g / m^{3}$ as shown. The density of oil in $k g / m^{3}$ could be : (a) 850 (b) 900 (c) 950 (d) 1050

8489.

A solid of density 900 kg/m3 floats in oil as shown in the given diagram. The oil floats on water of density 1000 kg/m3 as shown. The density of oil in kg/m3 could be : (a) 850 (b) 900 (c) 950 (d) 1050

Answer»

A solid of density $900 k g / m^{3}$ floats in oil as shown in the given diagram. The oil floats on water of density $1000 k g / m^{3}$ as shown. The density of oil in $k g / m^{3}$ could be :

(a) 850
(b) 900
(c) 950
(d) 1050

Discussion

8490.	What force makes a body to float or sink in a liquid?
Answer» What force makes a body to float or sink in a liquid?

Discussion

8491.	Sometimes it is observed that 2 magnets resting on a table to rotate. This occurs because
Answer» Sometimes it is observed that 2 magnets resting on a table to rotate. This occurs because

Discussion

8492.	how to use a scew gauge
Answer» how to use a scew gauge

Discussion

8493.	How is the power related to the speed at which a body can be lifted?
Answer» How is the power related to the speed at which a body can be lifted?

Discussion

8494.	A body of mass 20 kg is moving initially with a speed of 15 m/s. If a constant retarding force of 50 N is applied on it, how long does the body take to stop?
Answer» A body of mass 20 kg is moving initially with a speed of 15 m/s. If a constant retarding force of 50 N is applied on it, how long does the body take to stop?

Discussion

8495.	Which of the following is true for a body in circular motion?
Answer» Which of the following is true for a body in circular motion?

Discussion

8496.	Which of the following is a correct measure of velocity?
Answer» Which of the following is a correct measure of velocity?

Discussion

8497.	In rainy season dampness spreads on a wall, this happens due to
Answer» In rainy season dampness spreads on a wall, this happens due to

Discussion

8498.	A screw gauge has a least count 0.001 cm and zero error + 0.007 cm. Draw a neat diagram to represent it.
Answer» A screw gauge has a least count 0.001 cm and zero error + 0.007 cm. Draw a neat diagram to represent it.

Discussion

8499.	Acceleration is defined as the rate of change of:
Answer» Acceleration is defined as the rate of change of:

Discussion

8500.	The velocity-time graph of a moving body is given below: Find: (i) the acceleration in parts AB, BC and CD. (ii) displacement in each part AB,BC,CD,and (iii) total displacement.
Answer» The velocity-time graph of a moving body is given below: Find: (i) the acceleration in parts AB, BC and CD. (ii) displacement in each part AB,BC,CD,and (iii) total displacement.

8500.

The velocity-time graph of a moving body is given below: Find: (i) the acceleration in parts AB, BC and CD. (ii) displacement in each part AB,BC,CD,and (iii) total displacement.

Answer»

The velocity-time graph of a moving body is given below:

Find:

(i) the acceleration in parts AB, BC and CD.

(ii) displacement in each part AB,BC,CD,and

(iii) total displacement.

Discussion

Explore topic-wise InterviewSolutions in .

When two spring balances joined at their free ends, are pulled apart, both show the same reading. Explain.

In convection mode of transfer of heat :

Thrust is a ___ quantity.

Question 12 Gravitational force on the surface of the moon is only 16 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the Earth?

Name the quantity which is measured in (a) kWh (b) kW (c) Wh (d) eV.

A snail covers a distance of 100 metres in 50 hours. Calculate the average speed of snail in kmh

The method used in SONAR is

When a body moves uniformly along a circle, then:

A gun is fired in the air at a distance of 660 m from a person, He hears the sound of the gun after 2 seconds. What is the speed of sound?

From the displacement-time graph of a cyclist, given in the figure, find: (i) the average velocity in the first 4 s, (ii) the displacement from the initial position at the end of 10 s, (iii) the time after which he reaches the starting point.

A feather is dropped on the moon from a height of 10 m. The acceleration due to gravity on the moon is 1.67 ms2​. Determine the time taken by the feather to fall on the surface of the moon.

Calculate the pressure at a depth of 50 m below sea level. Given: Density of sea water = 1024 kg/m3. And, acceleration due to gravity g=10 m/s2

Can one apply force without motion?

How is the upthrust related to the volume of the body submerged in a liquid ?

A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.

What is the major difference between echo and reverberation?

Explain the working principle behind the functional advantage of a pressure cooker.

Two quantities A and B have different dimensions. Which mathematical operations given below are physically meaningful?

Two balls of the same size but of different materials , rubber and iron are kept on the smooth floor of a moving train. Will the balls start rolling ? If so , in which direction ? Will they move with the same speed ? Give reasons for your answer .

What is miles and how to convert it into km/hr??

Why do planets move ?

What are conservative forces ? Explain.

Law of conservation of energy states that

In vaccum heat is transferred by :

The near point of a hypermetropic eye is 1 m, what is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)

Question 7 Area under a v – t graph represents a physical quantity which has the unit (a) m2 (b) m (c) m3 (d) m/s

To move a boat ahead in water, the boatman has to push th ewater backwards by his oar. Explain.

In the kinetic theory of gases, it is assumed that molecular collisions are :-

Why is the solar cooker painted black from inside?

Conducting wire of uniform cross sectional area 2 cm2 and length 1 cm carries a current of 8 A and has a potential difference of 2 V. The resistivity of the material of the wire is:

How is multiple reflections helpful to doctors and engineers.

The liquids shown in the figure in the two arms are mercury (specific gravity = 13.6) and water. if the difference of heights of the mercury columns is 2 cm, find the height h of the water column. Acceleration due to gravity g = 10 m/s2

Are constellations members of our solar system?

Two stars emit maximum radiation at wavelength 3600˙A and 4800˙A respectively. The ratio of their temperatures is

Why does the body of a deep sea fish burst on bringing her above the sea level?

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is

A line makes an angle of θ x-axis. What is the slope of the line?

A solid of density 900 kg/m3 floats in oil as shown in the given diagram. The oil floats on water of density 1000 kg/m3 as shown. The density of oil in kg/m3 could be : (a) 850 (b) 900 (c) 950 (d) 1050

What force makes a body to float or sink in a liquid?

Sometimes it is observed that 2 magnets resting on a table to rotate. This occurs because

how to use a scew gauge

How is the power related to the speed at which a body can be lifted?

A body of mass 20 kg is moving initially with a speed of 15 m/s. If a constant retarding force of 50 N is applied on it, how long does the body take to stop?

Which of the following is true for a body in circular motion?

Which of the following is a correct measure of velocity?

In rainy season dampness spreads on a wall, this happens due to

A screw gauge has a least count 0.001 cm and zero error + 0.007 cm. Draw a neat diagram to represent it.

Acceleration is defined as the rate of change of:

The velocity-time graph of a moving body is given below: Find: (i) the acceleration in parts AB, BC and CD. (ii) displacement in each part AB,BC,CD,and (iii) total displacement.

A feather is dropped on the moon from a height of 10 m. The acceleration due to gravity on the moon is 1.67 ms2. Determine the time taken by the feather to fall on the surface of the moon.