13232 + Interview Questions in Physics Page 55 InterviewSolution

2701.	Unit of pressure and thrust is?
Answer» Unit of pressure and thrust is?

Discussion

2702.	Ratio between total intensity of magnetic field at equator to poles is :-(1) 1 : 1(2) 1 : 2(3) 2 : 1(4) 1 : 4
Answer» Ratio between total intensity of magnetic field at equator to poles is :- (1) 1 : 1 (2) 1 : 2 (3) 2 : 1 (4) 1 : 4

Discussion

2703.	What is the value of relative density of water ?
Answer» What is the value of relative density of water ?

Discussion

2704.	A cruise ship is sailing straight towards an island at an speed of 30 metres per second.it sounds the horn when it is 600 metres away from the island.calculate the time taken by the ship to hear an echo.(take the speed of sound as 300 metres per second) a) 1.82 sec b) 2.22 sec c) 3.64 sec d) 4.00 sec
Answer» A cruise ship is sailing straight towards an island at an speed of 30 metres per second.it sounds the horn when it is 600 metres away from the island.calculate the time taken by the ship to hear an echo.(take the speed of sound as 300 metres per second) a) 1.82 sec b) 2.22 sec c) 3.64 sec d) 4.00 sec

Discussion

2705.	Which of the following is the lens formula?
Answer» Which of the following is the lens formula?

Discussion

2706.	A force of 10 N acts on a body of mass 2 kg for 3 s, initially at rest. calculate : (i) the velocity acquired by the body, and (ii) change in momentum f the body.
Answer» A force of 10 N acts on a body of mass 2 kg for 3 s, initially at rest. calculate : (i) the velocity acquired by the body, and (ii) change in momentum f the body.

Discussion

2707.	In law of conservation of momentum the object experiences no external force then how it move?
Answer» In law of conservation of momentum the object experiences no external force then how it move?

Discussion

2708.	White light may be considered to be a mixture of waves of λ ranging between 3900 ˚A and 7800 ˚A. An oil film of thickness 10000 ˚A is examined normaly by the reflected light. If μ=1.4, then the film appears bright for
Answer» White light may be considered to be a mixture of waves of $λ$ ranging between $3900 ˚ A and 7800 ˚ A .$ An oil film of thickness $10000 ˚ A$ is examined normaly by the reflected light. If $μ = 1.4,$ then the film appears bright for

Discussion

2709.	Velocity and acceleration of a particle at some instant of time are v=3i+4j and a=-(6i+8j) respectively.At the same instant particle is at origin.Maximum x-coordinate of particle will be: 1.15m 2.0.75m 3.225 4.4m
Answer» Velocity and acceleration of a particle at some instant of time are v=3i+4j and a=-(6i+8j) respectively.At the same instant particle is at origin.Maximum x-coordinate of particle will be: 1.15m 2.0.75m 3.225 4.4m

Discussion

2710.	When a body moves with velocity v1 for first half of the journey and v2 for remaining half of the journey, it's average velocity is going by 2/Vav=1/v1+1/v2. If V1 and v2 are (15+-0.5)m/s and (30+-0.1) m/s. Find average velocity within error limits.
Answer» When a body moves with velocity v1 for first half of the journey and v2 for remaining half of the journey, it's average velocity is going by 2/Vav=1/v1+1/v2. If V1 and v2 are (15+-0.5)m/s and (30+-0.1) m/s. Find average velocity within error limits.

Discussion

2711.	A farmer goes around the square field with side 20 metre in 40 minutes. Calculate the speed of the farmer .what is the distance and displacement after 20 minutes?
Answer» A farmer goes around the square field with side 20 metre in 40 minutes. Calculate the speed of the farmer .what is the distance and displacement after 20 minutes?

Discussion

2712.	The cost of a cloth is Rs. 700 per metre and the cost of ribbon is Rs. 120 per meter. Saritha has bought 12 m cloth and 14 m ribbon. Find the total cost.
Answer» The cost of a cloth is Rs. 700 per metre and the cost of ribbon is Rs. 120 per meter. Saritha has bought $\frac{1}{2}$ m cloth and $\frac{1}{4}$ m ribbon. Find the total cost.

Discussion

2713.	Why are electrical wires not made up of non-metals?
Answer» Why are electrical wires not made up of non-metals?

Discussion

2714.	A wave source produces 20 crests and 20 troughs in 0.2 sec. Find the frequency of the wave.
Answer» A wave source produces $20$ crests and $20$ troughs in $0.2 s e c$ . Find the frequency of the wave.

Discussion

2715.	For reversible adiabatic compression in a steady flow process, the work transfer per unit mass is
Answer» For reversible adiabatic compression in a steady flow process, the work transfer per unit mass is

Discussion

2716.	If an increase in the length of copper wire is 0.5% due to stretching, the percentage increase in its resistance is:
Answer» If an increase in the length of copper wire is 0.5% due to stretching, the percentage increase in its resistance is:

Discussion

2717.	The relative density of silver is 10.8. The density of water is 1000 kg m−3. The density of silver is:
Answer» The relative density of silver is $10.8$ . The density of water is $1000 k g m^{- 3}$ . The density of silver is:

Discussion

2718.	In the arrangement shown in Figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then
Answer» In the arrangement shown in Figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

2718.

In the arrangement shown in Figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

Answer»

In the arrangement shown in Figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

Discussion

2719.	Why impulsive force is variable?
Answer» Why impulsive force is variable?

Discussion

2720.	a conversing lens made of a material of refractive index 1.53 has a focal length f equal to 16 cm in air. if the lens is immersed in a liquid of refractive index 1.33 then what will be its new focal length f in the liquid?
Answer» a conversing lens made of a material of refractive index 1.53 has a focal length f equal to 16 cm in air. if the lens is immersed in a liquid of refractive index 1.33 then what will be its new focal length f in the liquid?

Discussion

2721.	A particle of mass 1kg has been thrown with initial speed 20m/sec making an angle 60degree with the horizontal ground.the angular momentum of the particle about point of projection when the projectile is at the highest point is?
Answer» A particle of mass 1kg has been thrown with initial speed 20m/sec making an angle 60degree with the horizontal ground.the angular momentum of the particle about point of projection when the projectile is at the highest point is?

Discussion

2722.	A particle of mass m moves with const. Speed v on a circular path of radius r. Find magnitude of average force on it in half revolution.
Answer» A particle of mass m moves with const. Speed v on a circular path of radius r. Find magnitude of average force on it in half revolution.

Discussion

2723.	Solve the following problems.(a) A force of 1000 N was applied to stop a car that was moving with a constant velocity. The car stopped after moving through 10 m. How much is the work done?(b) A cart with mass 20 kg went 50 m in a straight line on a plain and smooth road when a force of 2 N was applied to it. How much work was done by the force?
Answer» Solve the following problems. (a) A force of 1000 N was applied to stop a car that was moving with a constant velocity. The car stopped after moving through 10 m. How much is the work done? (b) A cart with mass 20 kg went 50 m in a straight line on a plain and smooth road when a force of 2 N was applied to it. How much work was done by the force?

Discussion

2724.	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 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___ m.

Discussion

2725.	If a light rod of length 2l is webbed with another rod of mass m and length 2l. The light rod is hinged at free and the combination is given an angular velocity such that center of mass moves with velocity v. The kinetic energy of the rod is
Answer» If a light rod of length 2l is webbed with another rod of mass m and length 2l. The light rod is hinged at free and the combination is given an angular velocity such that center of mass moves with velocity v. The kinetic energy of the rod is

Discussion

2726.	The Heights of mercury surface in the two arms of the manometer shown are 2 cm and 8 cm. find the pressure of the gas in the cylinder? Patm = 105 N/m2 The density of mercury =13600kgm3. Acceleration due to gravity g=10ms2
Answer» The Heights of mercury surface in the two arms of the manometer shown are 2 cm and 8 cm. find the pressure of the gas in the cylinder? P_atm = 10⁵N/m² The density of mercury $= 13600 \frac{k g}{m^{3}}$ . Acceleration due to gravity $g = 10 \frac{m}{s^{2}}$

2726.

The Heights of mercury surface in the two arms of the manometer shown are 2 cm and 8 cm. find the pressure of the gas in the cylinder? Patm = 105 N/m2 The density of mercury =13600kgm3. Acceleration due to gravity g=10ms2

Answer»

The Heights of mercury surface in the two arms of the manometer shown are 2 cm and 8 cm. find the pressure of the gas in the cylinder? P_atm = 10⁵N/m²

The density of mercury $= 13600 \frac{k g}{m^{3}}$ . Acceleration due to gravity $g = 10 \frac{m}{s^{2}}$

Discussion

2727.	(a) Define buoyant force. Name two factors on which buoyant force depends. (b) What is the cause of buoyant force ? (c) When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons ? (g=10ms−2)
Answer» (a) Define buoyant force. Name two factors on which buoyant force depends. (b) What is the cause of buoyant force ? (c) When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons ? $(g = 10 m s^{- 2})$

Discussion

2728.	A wooden block floats in water with 7/10th of its volume outside water. If density of water is 1000kg/cm3,what will be the density of the material of this wooden block.
Answer» A wooden block floats in water with 7/10th of its volume outside water. If density of water is 1000kg/cm3,what will be the density of the material of this wooden block.

Discussion

2729.	What is electrostatic repulsion?
Answer» What is electrostatic repulsion?

Discussion

2730.	The time periods and the mean radii of the orbits of two planets around Sun are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to:
Answer» The time periods and the mean radii of the orbits of two planets around Sun are $T_{1}, T_{2} a n d r_{1}, r_{2}$ respectively. The ratio $\frac{T_{1}}{T_{2}}$ is equal to:

Discussion

2731.	Sonar makes use of: (a) infrasonic sound (b) ultrasound (c) ordinary sound (d) light.
Answer» Sonar makes use of: (a) infrasonic sound (b) ultrasound (c) ordinary sound (d) light.

2731.

Sonar makes use of: (a) infrasonic sound (b) ultrasound (c) ordinary sound (d) light.

Answer»

Sonar makes use of:

(a) infrasonic sound

(b) ultrasound

(c) ordinary sound

(d) light.

Discussion

2732.	A body has an initial velocity of 4 ms−1 and deceleration of 4 ms−2. What is the final velocity after travelling a distance of 2 m?
Answer» A body has an initial velocity of $4 m s^{- 1}$ and deceleration of $4 m s^{- 2}$ . What is the final velocity after travelling a distance of $2 m$ ?

Discussion

2733.	If the nth division of vernier scale coincide with (n-1 )th division of main scale. Then find out the least count of vernier callipers.
Answer» If the nth division of vernier scale coincide with (n-1 )th division of main scale. Then find out the least count of vernier callipers.

Discussion

2734.	Two satellites, of masses m and 2 m, are on the same circular orbit around earth. If the velocity of the lighter satellite is vo , what is the velocity of the heavier satellite?
Answer» Two satellites, of masses m and 2 m, are on the same circular orbit around earth. If the velocity of the lighter satellite is $v_{o}$ , what is the velocity of the heavier satellite?

Discussion

2735.	Suppose that a box is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the box? (in m/s2) ___
Answer» Suppose that a box is accelerating at a rate of 2 m/s². If the net force is tripled and the mass is doubled, then what is the new acceleration of the box? (in m/s²) ___

Discussion

2736.	What does the third law of motion state? Explain.
Answer» What does the third law of motion state? Explain.

Discussion

2737.	The maximum speed of vibrations which produce audible sound will be in : (a) dry air (b) sea water (c) ground glass (d) human - blood
Answer» The maximum speed of vibrations which produce audible sound will be in : (a) dry air (b) sea water (c) ground glass (d) human - blood

2737.

The maximum speed of vibrations which produce audible sound will be in : (a) dry air (b) sea water (c) ground glass (d) human - blood

Answer»

The maximum speed of vibrations which produce audible sound will be in :

(a) dry air

(b) sea water

(c) ground glass

(d) human - blood

Discussion

2738.	Two particles execute SHM of the same amplitude and frequency, along the same straight line and from the same mean position. They cross one another without collision when going in opposite directions each time the displacement from mean position is half of their amplitudes. The phase-difference between them is,
Answer» Two particles execute $S H M$ of the same amplitude and frequency, along the same straight line and from the same mean position. They cross one another without collision when going in opposite directions each time the displacement from mean position is half of their amplitudes. The phase-difference between them is,

Discussion

2739.	Answer the following questions.a. Explain the construction of Galileo’s telescope.b. Explain the construction of a radio telescope.c. Why are optical telescopes located in uninhabited places on mountains?d. Why can an X-ray telescope not be based on the earth?
Answer» Answer the following questions. a. Explain the construction of Galileo’s telescope. b. Explain the construction of a radio telescope. c. Why are optical telescopes located in uninhabited places on mountains? d. Why can an X-ray telescope not be based on the earth?

Discussion

2740.	Alarge truck and a car, both moving with a velocity of magnitude v,have a head-on collision and both of them come to a halt after that.If the collision lasts for 1 s:(a) Whichvehicle experiences the greater force of impact?(b) Whichvehicle experiences the greater change in momentum?(c) Whichvehicle experiences the greater acceleration?(d)Whyis the car likely to suffer more damage than the truck?
Answer» A large truck and a car, both moving with a velocity of magnitude v, have a head-on collision and both of them come to a halt after that. If the collision lasts for 1 s: (a) Which vehicle experiences the greater force of impact? (b) Which vehicle experiences the greater change in momentum? (c) Which vehicle experiences the greater acceleration? (d)Why is the car likely to suffer more damage than the truck?

2740.

Alarge truck and a car, both moving with a velocity of magnitude v,have a head-on collision and both of them come to a halt after that.If the collision lasts for 1 s:(a) Whichvehicle experiences the greater force of impact?(b) Whichvehicle experiences the greater change in momentum?(c) Whichvehicle experiences the greater acceleration?(d)Whyis the car likely to suffer more damage than the truck?

Answer»

A
large truck and a car, both moving with a velocity of magnitude v,
have a head-on collision and both of them come to a halt after that.
If the collision lasts for 1 s:

(a) Which
vehicle experiences the greater force of impact?

(b) Which
vehicle experiences the greater change in momentum?

(c) Which
vehicle experiences the greater acceleration?

(d)Why
is the car likely to suffer more damage than the truck?

Discussion

2741.	The displacement-time graph for a body with non-uniform motion is a _____.
Answer» The displacement-time graph for a body with non-uniform motion is a _____.

Discussion

2742.	Draw the circuit diagram to represent the circuit shown below:
Answer» Draw the circuit diagram to represent the circuit shown below:

Discussion

2743.	ntif an object projected from ground with speed u horizontal range is two times the maximum height attained by it. The horizontal range of object is ?n ntn
Answer» ntif an object projected from ground with speed u horizontal range is two times the maximum height attained by it. The horizontal range of object is ?n ntn

Discussion

2744.	A ball of mass, m is released from the top of an inclined plane of inclination tetha as shown.it strike a rigid surface ar a distance 3l\4 from top elastically. Impulse imparted to ball by the rigid surface is
Answer» A ball of mass, m is released from the top of an inclined plane of inclination tetha as shown.it strike a rigid surface ar a distance 3l\4 from top elastically. Impulse imparted to ball by the rigid surface is

Discussion

2745.	Two masses of 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momentum is
Answer» Two masses of 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momentum is

Discussion

2746.	A bas appear to move northward at a speed of 203 km per hour to a man driving his car eastwards with speed 20 km per hour .find the velocity of bus with respect to ground (with angle).
Answer» A bas appear to move northward at a speed of 203 km per hour to a man driving his car eastwards with speed 20 km per hour .find the velocity of bus with respect to ground (with angle).

Discussion

2747.	Using mirror formula show that : 1.An object placed between focus and centre of curvature of a concave mirror produces a real image beyond the centre of curvature 2.for an object placed between the pole and the focus of a concave mirror, the image is always virtual and enlarged 3.a convex mirror always produces a virtual image independent of the location of the object 4.the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole of the mirror
Answer» Using mirror formula show that : 1.An object placed between focus and centre of curvature of a concave mirror produces a real image beyond the centre of curvature 2.for an object placed between the pole and the focus of a concave mirror, the image is always virtual and enlarged 3.a convex mirror always produces a virtual image independent of the location of the object 4.the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole of the mirror

Discussion

2748.	There is an air bubble of radius 1.0 mm in a liquid of surface tension 0.075 Nm-1 and density 1000 kg m-3. The bubble is at a depth of 10 cm below the free surface. By what amount is the pressure inside the bubble greater than the atmospheric pressure? Take g = 9.8 m s-2.
Answer» There is an air bubble of radius 1.0 mm in a liquid of surface tension 0.075 Nm^-1 and density 1000 kg m^-3. The bubble is at a depth of 10 cm below the free surface. By what amount is the pressure inside the bubble greater than the atmospheric pressure? Take g = 9.8 m s^-2.

Discussion

2749.	136.A bullet leaves the barrel of a rifle with a speed of 300m/s. If the length of the barrel is 0.9 m, at what rate is the bullet accelerated while in the barrel?
Answer» 136.A bullet leaves the barrel of a rifle with a speed of 300m/s. If the length of the barrel is 0.9 m, at what rate is the bullet accelerated while in the barrel?

Discussion

2750.	Define the unit of heat and one calorie heat.
Answer» Define the unit of heat and one calorie heat.

Discussion

Explore topic-wise InterviewSolutions in .

Unit of pressure and thrust is?

Ratio between total intensity of magnetic field at equator to poles is :-(1) 1 : 1(2) 1 : 2(3) 2 : 1(4) 1 : 4

What is the value of relative density of water ?

Which of the following is the lens formula?

A force of 10 N acts on a body of mass 2 kg for 3 s, initially at rest. calculate : (i) the velocity acquired by the body, and (ii) change in momentum f the body.

In law of conservation of momentum the object experiences no external force then how it move?

White light may be considered to be a mixture of waves of λ ranging between 3900 ˚A and 7800 ˚A. An oil film of thickness 10000 ˚A is examined normaly by the reflected light. If μ=1.4, then the film appears bright for

Velocity and acceleration of a particle at some instant of time are v=3i+4j and a=-(6i+8j) respectively.At the same instant particle is at origin.Maximum x-coordinate of particle will be: 1.15m 2.0.75m 3.225 4.4m

When a body moves with velocity v1 for first half of the journey and v2 for remaining half of the journey, it's average velocity is going by 2/Vav=1/v1+1/v2. If V1 and v2 are (15+-0.5)m/s and (30+-0.1) m/s. Find average velocity within error limits.

A farmer goes around the square field with side 20 metre in 40 minutes. Calculate the speed of the farmer .what is the distance and displacement after 20 minutes?

The cost of a cloth is Rs. 700 per metre and the cost of ribbon is Rs. 120 per meter. Saritha has bought 12 m cloth and 14 m ribbon. Find the total cost.

Why are electrical wires not made up of non-metals?

A wave source produces 20 crests and 20 troughs in 0.2 sec. Find the frequency of the wave.

For reversible adiabatic compression in a steady flow process, the work transfer per unit mass is

If an increase in the length of copper wire is 0.5% due to stretching, the percentage increase in its resistance is:

The relative density of silver is 10.8. The density of water is 1000 kg m−3. The density of silver is:

In the arrangement shown in Figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

Why impulsive force is variable?

a conversing lens made of a material of refractive index 1.53 has a focal length f equal to 16 cm in air. if the lens is immersed in a liquid of refractive index 1.33 then what will be its new focal length f in the liquid?

A particle of mass 1kg has been thrown with initial speed 20m/sec making an angle 60degree with the horizontal ground.the angular momentum of the particle about point of projection when the projectile is at the highest point is?

A particle of mass m moves with const. Speed v on a circular path of radius r. Find magnitude of average force on it in half revolution.

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.

If a light rod of length 2l is webbed with another rod of mass m and length 2l. The light rod is hinged at free and the combination is given an angular velocity such that center of mass moves with velocity v. The kinetic energy of the rod is

The Heights of mercury surface in the two arms of the manometer shown are 2 cm and 8 cm. find the pressure of the gas in the cylinder? Patm = 105 N/m2 The density of mercury =13600kgm3. Acceleration due to gravity g=10ms2

(a) Define buoyant force. Name two factors on which buoyant force depends. (b) What is the cause of buoyant force ? (c) When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons ? (g=10ms−2)

A wooden block floats in water with 7/10th of its volume outside water. If density of water is 1000kg/cm3,what will be the density of the material of this wooden block.

What is electrostatic repulsion?

The time periods and the mean radii of the orbits of two planets around Sun are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to:

Sonar makes use of: (a) infrasonic sound (b) ultrasound (c) ordinary sound (d) light.

A body has an initial velocity of 4 ms−1 and deceleration of 4 ms−2. What is the final velocity after travelling a distance of 2 m?

If the nth division of vernier scale coincide with (n-1 )th division of main scale. Then find out the least count of vernier callipers.

Two satellites, of masses m and 2 m, are on the same circular orbit around earth. If the velocity of the lighter satellite is vo , what is the velocity of the heavier satellite?

Suppose that a box is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the box? (in m/s2) ___

What does the third law of motion state? Explain.

The maximum speed of vibrations which produce audible sound will be in : (a) dry air (b) sea water (c) ground glass (d) human - blood

Answer the following questions.a. Explain the construction of Galileo’s telescope.b. Explain the construction of a radio telescope.c. Why are optical telescopes located in uninhabited places on mountains?d. Why can an X-ray telescope not be based on the earth?

The displacement-time graph for a body with non-uniform motion is a _____.

Draw the circuit diagram to represent the circuit shown below:

ntif an object projected from ground with speed u horizontal range is two times the maximum height attained by it. The horizontal range of object is ?n ntn

A ball of mass, m is released from the top of an inclined plane of inclination tetha as shown.it strike a rigid surface ar a distance 3l\4 from top elastically. Impulse imparted to ball by the rigid surface is

Two masses of 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momentum is

A bas appear to move northward at a speed of 203 km per hour to a man driving his car eastwards with speed 20 km per hour .find the velocity of bus with respect to ground (with angle).

There is an air bubble of radius 1.0 mm in a liquid of surface tension 0.075 Nm-1 and density 1000 kg m-3. The bubble is at a depth of 10 cm below the free surface. By what amount is the pressure inside the bubble greater than the atmospheric pressure? Take g = 9.8 m s-2.

136.A bullet leaves the barrel of a rifle with a speed of 300m/s. If the length of the barrel is 0.9 m, at what rate is the bullet accelerated while in the barrel?

Define the unit of heat and one calorie heat.