13232 + Interview Questions in Physics Page 94 InterviewSolution

4651.	The density of an object is slightly less than that of water. Will it float or sink in water?
Answer» The density of an object is slightly less than that of water. Will it float or sink in water?

Discussion

4652.	A conductor of length L has an uniform cross section the radius of the cross section where is linearly from A to B the resistivity of the material is " r " find the resistance of the conductor across its ends.
Answer» A conductor of length L has an uniform cross section the radius of the cross section where is linearly from A to B the resistivity of the material is " r " find the resistance of the conductor across its ends.

Discussion

4653.	A monkey is jumping up and down on a trampoline. At the very top of his jump, what is true about his velocity and acceleration?
Answer» A monkey is jumping up and down on a trampoline. At the very top of his jump, what is true about his velocity and acceleration?

Discussion

4654.	What are effector cells and how they differ from memory cells?
Answer» What are effector cells and how they differ from memory cells?

Discussion

4655.	Cell in Latin means
Answer» Cell in Latin means

Discussion

4656.	The speed of sound in air is
Answer» The speed of sound in air is

Discussion

4657.	A man stands at a distance of 68 m from a cliff and fires a gun. The time interval after which will he hears the echo is: [Take the speed of sound in air is 340 m s-1]
Answer» A man stands at a distance of 68 m from a cliff and fires a gun. The time interval after which will he hears the echo is: [Take the speed of sound in air is 340 m s-1]

4657.

A man stands at a distance of 68 m from a cliff and fires a gun. The time interval after which will he hears the echo is: [Take the speed of sound in air is 340 m s-1]

Answer»

A man stands at a distance of 68 m from a cliff and fires a gun.
The time interval after which will he hears the echo is:

[Take the speed of sound in air is 340 m s-1]

Discussion

4658.	A ball of mass 0.2 kg moves with a velocity of 20 m/s and it stops in 0.1 s;then the force on the ball is
Answer» A ball of mass 0.2 kg moves with a velocity of 20 m/s and it stops in 0.1 s;then the force on the ball is

Discussion

4659.	a person uses spectacles of power -0.5D for distinct vision . How far is the far point of the person?
Answer» a person uses spectacles of power -0.5D for distinct vision . How far is the far point of the person?

Discussion

4660.	a particle of mass 1 kg is at (-1,1) and moving with velocity v=3i+4j m/s. It's angular momentum about x axis is (in SI unit)1) 72) 13) Zero4) 12
Answer» a particle of mass 1 kg is at (-1,1) and moving with velocity v=3i+4j m/s. It's angular momentum about x axis is (in SI unit) 1) 7 2) 1 3) Zero 4) 12

Discussion

4661.	Why free electrons are required for conduction of electricity ?
Answer» Why free electrons are required for conduction of electricity ?

Discussion

4662.	A bullet of mass 50 g is moving with a velocity of 500 m/s. If it penetrates into a 10 cm still target and comes to rest, calculate the average retarding force offered by the target.
Answer» A bullet of mass 50 g is moving with a velocity of 500 m/s. If it penetrates into a 10 cm still target and comes to rest, calculate the average retarding force offered by the target.

Discussion

4663.	Fill in the following blanks with suitable words : (a) The acceleration due to gravity on the moon is about ___ of that on the earth. (b) In order that the force of gravitation between two bodies may become noticeable and cause motion, one of the bodies must have an extremely large ___ (c) The weight of an object on the earth is about ___ of its weight on the moon. (d) The weight of an object on the moon is about ___ of its weight on the earth. (e) The value of g on the earth is about ___ of that on the moon. (f) If the weight of a body is 6 N on the moon, it will be about ___on the earth.
Answer» Fill in the following blanks with suitable words : (a) The acceleration due to gravity on the moon is about ___ of that on the earth. (b) In order that the force of gravitation between two bodies may become noticeable and cause motion, one of the bodies must have an extremely large ___ (c) The weight of an object on the earth is about ___ of its weight on the moon. (d) The weight of an object on the moon is about ___ of its weight on the earth. (e) The value of g on the earth is about ___ of that on the moon. (f) If the weight of a body is 6 N on the moon, it will be about ___on the earth.

Discussion

4664.	A boy is pulling a cart by supplying a constant force of 8N on a straight path of 20 m. On around about of 10m diameter he forgets the path and takes 1.5 turns and then continues on the straight path of another 20 m. Find the net work done by the boy on the cart .
Answer» A boy is pulling a cart by supplying a constant force of 8N on a straight path of 20 m. On around about of 10m diameter he forgets the path and takes 1.5 turns and then continues on the straight path of another 20 m. Find the net work done by the boy on the cart .

Discussion

4665.	how much energy absorbed by 10mol of ideal gas if it expands reversibly fom 8atm to 4atm at 27c
Answer» how much energy absorbed by 10mol of ideal gas if it expands reversibly fom 8atm to 4atm at 27c

Discussion

4666.	What do you mean by buoyancy? [1 MARK]
Answer» What do you mean by buoyancy? [1 MARK]

Discussion

4667.	Question 6The given figure shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:(a) Which of the three is travelling the fastest?(b) Are all three ever at the same point on the road?(c) How far has C travelled when B passes A?(d) How far has B travelled by the time it passes C?
Answer» Question 6 The given figure shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions: (a) Which of the three is travelling the fastest? (b) Are all three ever at the same point on the road? (c) How far has C travelled when B passes A? (d) How far has B travelled by the time it passes C?

Discussion

4668.	A tube light of 50 W is lighted for 4 hours and an electric bulb of 100 W is lighted for 3 hours. What will be the cost of consumed energy daily if cost per unit is ₹2?
Answer» A tube light of 50 W is lighted for 4 hours and an electric bulb of 100 W is lighted for 3 hours. What will be the cost of consumed energy daily if cost per unit is ₹2?

Discussion

4669.	Why hydro power plants are associated with dams?
Answer» Why hydro power plants are associated with dams?

Discussion

4670.	In the given figure if the mirror is rotated by an angle ϕ in the clockwise direction, then the angle of incidence becomes equal to:
Answer» In the given figure if the mirror is rotated by an angle $ϕ$ in the clockwise direction, then the angle of incidence becomes equal to:

4670.

In the given figure if the mirror is rotated by an angle ϕ in the clockwise direction, then the angle of incidence becomes equal to:

Answer»

In the given figure if the mirror is rotated by an angle $ϕ$ in the clockwise direction, then the angle of incidence becomes equal to:

Discussion

4671.	21.Three photodiodesd1,d2, D3 are made of semiconductors having band gaps of 2.5eV, 2eV, and 3eV respectively. Which one is able to detect a light of wavelength 6000 A^° ?
Answer» 21.Three photodiodesd1,d2, D3 are made of semiconductors having band gaps of 2.5eV, 2eV, and 3eV respectively. Which one is able to detect a light of wavelength 6000 A^° ?

Discussion

4672.	A source of unknown frequency gives 4 beats/s, when sounded with a source of frequency 250 Hz. The second harmonic of the source of an unknown frequency gives 5 beats/s, when sounded with a source of frequency 513 Hz. The unknown frequency is-
Answer» A source of unknown frequency gives $4 beats/s,$ when sounded with a source of frequency $250 Hz .$ The second harmonic of the source of an unknown frequency gives $5 beats/s,$ when sounded with a source of frequency $513 Hz .$ The unknown frequency is-

Discussion

4673.	A cricketer stops a ball travelling at the speed of 10 m/s in 0.5 s. If the mass of the ball is 0.1 kg then the average force applied by the player is
Answer» A cricketer stops a ball travelling at the speed of $10 m/s$ in $0.5 s$ . If the mass of the ball is $0.1 kg$ then the average force applied by the player is

Discussion

4674.	When a cricket ball is thrown vertically upwards, it reaches a maximum height of 5 metres.(i) What was the initial speed of the ball?(ii) How much time is taken by the ball to reach the highest point? (g = 10 m s−2)
Answer» When a cricket ball is thrown vertically upwards, it reaches a maximum height of 5 metres. (i) What was the initial speed of the ball? (ii) How much time is taken by the ball to reach the highest point? (g = 10 m s⁻²)

Discussion

4675.	difference between compound microscope and electron microscope
Answer» difference between compound microscope and electron microscope

Discussion

4676.	the ball dropped from the top of the tower falls first half height of tower in 10s total time spend by ball in air is
Answer» the ball dropped from the top of the tower falls first half height of tower in 10s total time spend by ball in air is

Discussion

4677.	30. Tho stevabon in boling point of po cano sigarsolution made by miking 34 2 g of canesugar in1kg of water ni (k, for water r1052 K kg mor,(2,0052 к(11 0 52 K(3) 104 x
Answer» 30. Tho stevabon in boling point of po cano sigarsolution made by miking 34 2 g of canesugar in1kg of water ni (k, for water r1052 K kg mor,(2,0052 к(11 0 52 K(3) 104 x

Discussion

4678.	A vertical wire kept in Z−X plane carries a current from Q to P (see figure). The magnetic field due to current will have the direction at the origin O along
Answer» A vertical wire kept in $Z - X$ plane carries a current from $Q$ to $P$ (see figure). The magnetic field due to current will have the direction at the origin $O$ along

Discussion

4679.	12. A uniform cubical block is subjected to volumetriccompression, which decreases its each side by2% The Bulk strain produced in it is(1) 0.03(2) 0.02(4) 0.12(3) 0.06
Answer» 12. A uniform cubical block is subjected to volumetriccompression, which decreases its each side by2% The Bulk strain produced in it is(1) 0.03(2) 0.02(4) 0.12(3) 0.06

Discussion

4680.	The marriageable age in the Rig Veda seems to have been
Answer» The marriageable age in the Rig Veda seems to have been

Discussion

4681.	If n1 and n2 are the frequencies of sound waves producing beats then the timeinterval between one maxima and next maxima is ?
Answer» If n1 and n2 are the frequencies of sound waves producing beats then the timeinterval between one maxima and next maxima is ?

Discussion

4682.	If in Fig. 4.1 iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer.
Answer» If in Fig. 4.1 iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer.

Discussion

4683.	A thin glass plate of area A and mass m is hinged along one of its sides. The speed with which the air should be blown parallel to its upper surface to hold the plate horizontal is γ√mg18ρA. If the density of air is ρ. Then the value of γ is
Answer» A thin glass plate of area $A$ and mass $m$ is hinged along one of its sides. The speed with which the air should be blown parallel to its upper surface to hold the plate horizontal is $γ \sqrt{\frac{m g}{18 ρ A}}$ . If the density of air is $ρ$ . Then the value of $γ$ is

Discussion

4684.	Question 1Draw magnetic field lines around a bar magnet.
Answer» Question 1 Draw magnetic field lines around a bar magnet.

Discussion

4685.	What is recoil velocity of gun? Also prove it.
Answer» What is recoil velocity of gun? Also prove it.

Discussion

4686.	Name any three devices which use permanent magnets. Name some sources of direct current. [3 MARKS]
Answer» Name any three devices which use permanent magnets. Name some sources of direct current. [3 MARKS]

Discussion

4687.	One end of a long iron chain of linear mass density λ is fixed to a sphere of mass m and specific density 13 while the other end is free. The sphere along with the chain is immersed in a deep lake. If specific density of iron is 7. If the height h above the bed of the lake at which the sphere will float in equilibrium is xm3λ. then the value of x is (Assume that the part of the chain lying on the bottom of the lake exerts negligible force on the upper part of the chain)
Answer» One end of a long iron chain of linear mass density $λ$ is fixed to a sphere of mass $m$ and specific density $\frac{1}{3}$ while the other end is free. The sphere along with the chain is immersed in a deep lake. If specific density of iron is 7. If the height $h$ above the bed of the lake at which the sphere will float in equilibrium is $\frac{x m}{3 λ}$ . then the value of $x$ is (Assume that the part of the chain lying on the bottom of the lake exerts negligible force on the upper part of the chain)

Discussion

4688.	What is the difference between inertia and Newton's first law of motion?
Answer» What is the difference between inertia and Newton's first law of motion?

Discussion

4689.	When ice melts, its volume___
Answer» When ice melts, its volume___

Discussion

4690.	Two charges +q1 and -q2 are placed at points A and b respectively. A line of force emanates from q1 at an angle 'alpha' with the line AB. At what angle will it terminate at -q2 ?
Answer» Two charges +q1 and -q2 are placed at points A and b respectively. A line of force emanates from q1 at an angle 'alpha' with the line AB. At what angle will it terminate at -q2 ?

Discussion

4691.	The ε0 and μ0 are the electric pemittivity and magnetic permeability in a free space. If ε and μ are the corresponding quantities in medium, the refractive index of the medium is
Answer» The $ε_{0}$ and $μ_{0}$ are the electric pemittivity and magnetic permeability in a free space. If $ε$ and $μ$ are the corresponding quantities in medium, the refractive index of the medium is

Discussion

4692.	A cylindrical tank is filled with water to a level of 3 m. A hole is opened at a height of 52.5 cm from bottom. The ratio of the area of the hole to that of cross sectional area of the cylinder is 0.1. Find the square of the velocity (in m2/sec2) with which water is coming out. (g=10 m/sec2)
Answer» A cylindrical tank is filled with water to a level of 3 m. A hole is opened at a height of 52.5 cm from bottom. The ratio of the area of the hole to that of cross sectional area of the cylinder is 0.1. Find the square of the velocity (in $m^{2} / {sec}^{2}$ ) with which water is coming out. $(g = 10 m / {sec}^{2})$

Discussion

4693.	Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
Answer» Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Discussion

4694.	a sound absorber attentuates the sound level by 20dB. the intensity deacreases by a factor of (a)100 (b)1000(c)10000(d)10
Answer» a sound absorber attentuates the sound level by 20dB. the intensity deacreases by a factor of (a)100 (b)1000(c)10000(d)10

Discussion

4695.	A body travels half of its total path in the last second of its free fall from rest. The duration offall is nearly(A) 3.4 sec(C) 5 sec(B) 4.5 sec(D) 5.5 sec
Answer» A body travels half of its total path in the last second of its free fall from rest. The duration offall is nearly(A) 3.4 sec(C) 5 sec(B) 4.5 sec(D) 5.5 sec

Discussion

4696.	If the speed of sound in air at room temperature is 340 m/s,then how does sound become fainter as it passes more and more through the medium?
Answer» If the speed of sound in air at room temperature is 340 m/s,then how does sound become fainter as it passes more and more through the medium?

Discussion

4697.	Tinku dropped a stone into a very deep well. He hears the sound 6.53 s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity, g=10ms2 and vsound=340ms.
Answer» Tinku dropped a stone into a very deep well. He hears the sound 6.53 s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity, $g = 10 \frac{m}{s^{2}}$ and $v_{s o u n d} = 340 \frac{m}{s}$ .

Discussion

4698.	The packing efficiency of teo dimensional square unit cell shown below is
Answer» The packing efficiency of teo dimensional square unit cell shown below is

Discussion

4699.	when we listen to the sound produced by a runing fork and the sound of the same frequency produced by a sitar we find that tuning fork sounds flat whereas the sitar sounds shrill. why? Explain by their waveform.
Answer» when we listen to the sound produced by a runing fork and the sound of the same frequency produced by a sitar we find that tuning fork sounds flat whereas the sitar sounds shrill. why? Explain by their waveform.

Discussion

4700.	identical springs of Steel and copper are stretched by equal force then more work is done in stretching copper spring or steel spring
Answer» identical springs of Steel and copper are stretched by equal force then more work is done in stretching copper spring or steel spring

Discussion

Explore topic-wise InterviewSolutions in .

The density of an object is slightly less than that of water. Will it float or sink in water?

A conductor of length L has an uniform cross section the radius of the cross section where is linearly from A to B the resistivity of the material is " r " find the resistance of the conductor across its ends.

A monkey is jumping up and down on a trampoline. At the very top of his jump, what is true about his velocity and acceleration?

What are effector cells and how they differ from memory cells?

Cell in Latin means

The speed of sound in air is

A man stands at a distance of 68 m from a cliff and fires a gun. The time interval after which will he hears the echo is: [Take the speed of sound in air is 340 m s-1]

A ball of mass 0.2 kg moves with a velocity of 20 m/s and it stops in 0.1 s;then the force on the ball is

a person uses spectacles of power -0.5D for distinct vision . How far is the far point of the person?

a particle of mass 1 kg is at (-1,1) and moving with velocity v=3i+4j m/s. It's angular momentum about x axis is (in SI unit)1) 72) 13) Zero4) 12

Why free electrons are required for conduction of electricity ?

A bullet of mass 50 g is moving with a velocity of 500 m/s. If it penetrates into a 10 cm still target and comes to rest, calculate the average retarding force offered by the target.

A boy is pulling a cart by supplying a constant force of 8N on a straight path of 20 m. On around about of 10m diameter he forgets the path and takes 1.5 turns and then continues on the straight path of another 20 m. Find the net work done by the boy on the cart .

how much energy absorbed by 10mol of ideal gas if it expands reversibly fom 8atm to 4atm at 27c

What do you mean by buoyancy? [1 MARK]

A tube light of 50 W is lighted for 4 hours and an electric bulb of 100 W is lighted for 3 hours. What will be the cost of consumed energy daily if cost per unit is ₹2?

Why hydro power plants are associated with dams?

In the given figure if the mirror is rotated by an angle ϕ in the clockwise direction, then the angle of incidence becomes equal to:

21.Three photodiodesd1,d2, D3 are made of semiconductors having band gaps of 2.5eV, 2eV, and 3eV respectively. Which one is able to detect a light of wavelength 6000 A^° ?

A source of unknown frequency gives 4 beats/s, when sounded with a source of frequency 250 Hz. The second harmonic of the source of an unknown frequency gives 5 beats/s, when sounded with a source of frequency 513 Hz. The unknown frequency is-

A cricketer stops a ball travelling at the speed of 10 m/s in 0.5 s. If the mass of the ball is 0.1 kg then the average force applied by the player is

When a cricket ball is thrown vertically upwards, it reaches a maximum height of 5 metres.(i) What was the initial speed of the ball?(ii) How much time is taken by the ball to reach the highest point? (g = 10 m s−2)

difference between compound microscope and electron microscope

the ball dropped from the top of the tower falls first half height of tower in 10s total time spend by ball in air is

30. Tho stevabon in boling point of po cano sigarsolution made by miking 34 2 g of canesugar in1kg of water ni (k, for water r1052 K kg mor,(2,0052 к(11 0 52 K(3) 104 x

A vertical wire kept in Z−X plane carries a current from Q to P (see figure). The magnetic field due to current will have the direction at the origin O along

12. A uniform cubical block is subjected to volumetriccompression, which decreases its each side by2% The Bulk strain produced in it is(1) 0.03(2) 0.02(4) 0.12(3) 0.06

The marriageable age in the Rig Veda seems to have been

If n1 and n2 are the frequencies of sound waves producing beats then the timeinterval between one maxima and next maxima is ?

If in Fig. 4.1 iron nail is replaced by a wooden stick, will the bulb​ glow or not? Justify your answer.​

A thin glass plate of area A and mass m is hinged along one of its sides. The speed with which the air should be blown parallel to its upper surface to hold the plate horizontal is γ√mg18ρA. If the density of air is ρ. Then the value of γ is

Question 1Draw magnetic field lines around a bar magnet.

What is recoil velocity of gun? Also prove it.

Name any three devices which use permanent magnets. Name some sources of direct current. [3 MARKS]

What is the difference between inertia and Newton's first law of motion?

When ice melts, its volume___

Two charges +q1 and -q2 are placed at points A and b respectively. A line of force emanates from q1 at an angle 'alpha' with the line AB. At what angle will it terminate at -q2 ?

The ε0 and μ0 are the electric pemittivity and magnetic permeability in a free space. If ε and μ are the corresponding quantities in medium, the refractive index of the medium is

A cylindrical tank is filled with water to a level of 3 m. A hole is opened at a height of 52.5 cm from bottom. The ratio of the area of the hole to that of cross sectional area of the cylinder is 0.1. Find the square of the velocity (in m2/sec2) with which water is coming out. (g=10 m/sec2)

Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

a sound absorber attentuates the sound level by 20dB. the intensity deacreases by a factor of (a)100 (b)1000(c)10000(d)10

A body travels half of its total path in the last second of its free fall from rest. The duration offall is nearly(A) 3.4 sec(C) 5 sec(B) 4.5 sec(D) 5.5 sec

If the speed of sound in air at room temperature is 340 m/s,then how does sound become fainter as it passes more and more through the medium?

Tinku dropped a stone into a very deep well. He hears the sound 6.53 s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity, g=10ms2 and vsound=340ms.

The packing efficiency of teo dimensional square unit cell shown below is

when we listen to the sound produced by a runing fork and the sound of the same frequency produced by a sitar we find that tuning fork sounds flat whereas the sitar sounds shrill. why? Explain by their waveform.

identical springs of Steel and copper are stretched by equal force then more work is done in stretching copper spring or steel spring

If in Fig. 4.1 iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer.