13232 + Interview Questions in Physics

1.	18.A wire of resistance 5 ohm is melted and cost again into a new wire of half the radius. FIND the resistance of the new wire.
Answer» 18.A wire of resistance 5 ohm is melted and cost again into a new wire of half the radius. FIND the resistance of the new wire.

Discussion

2.	With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take a=9.8 ms−2)
Answer» With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take $a = 9.8 m s^{- 2}$ )

Discussion

3.	From the top of a tower 19.6 m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of 45° with horizontal, then initial velocity of the ball is :-1) 9.8 m/s2) 4.9 m/s3) 14.7 m/s4) 2.8 m/s
Answer» From the top of a tower 19.6 m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of 45° with horizontal, then initial velocity of the ball is :- 1) 9.8 m/s 2) 4.9 m/s 3) 14.7 m/s 4) 2.8 m/s

Discussion

4.	Question 24 Two stones are thrown vertically upwards simultaneously with their initial velocities u1 and u2 respectively. Prove that the heights reached by them would be in the ration of u21 ; u22 ( Assume upward acceleration is –g and downward acceleration to be +g).
Answer» Question 24 Two stones are thrown vertically upwards simultaneously with their initial velocities $u_{1}$ and $u_{2}$ respectively. Prove that the heights reached by them would be in the ration of $u_{1}^{2}$ ; $u_{2}^{2}$ ( Assume upward acceleration is –g and downward acceleration to be +g).

Discussion

5.	Two wires of same materials has length ratio 1:2 and mass ratio 2:3. What will be their resistance ratio
Answer» Two wires of same materials has length ratio 1:2 and mass ratio 2:3. What will be their resistance ratio

Discussion

6.	Water is used to cool radiators of engines, because
Answer» Water is used to cool radiators of engines, because

Discussion

7.	a physical quantity is measured and its value is found to be nu where n=numerical value, u=unit. prove that n is inversely proportional to u.
Answer» a physical quantity is measured and its value is found to be nu where n=numerical value, u=unit. prove that n is inversely proportional to u.

Discussion

8.	Focal length f of a spherical mirror, is given by. 1where u and v are object and imagepositions respectively then choose the correctrelation.- 1AfAuAV+fAf(2)+4vuAu Av+Holy11Af(3)V4Au Av++u vuvAFAf Av Au(4) 2v2uP
Answer» Focal length f of a spherical mirror, is given by. 1where u and v are object and imagepositions respectively then choose the correctrelation.- 1AfAuAV+fAf(2)+4vuAu Av+Holy11Af(3)V4Au Av++u vuvAFAf Av Au(4) 2v2uP

Discussion

9.	Suppose a space shuttle is in orbit about the earth at 400 km above its surface. Determine the orbital speed and the orbital period of the Space Shuttle. Use the information given below. G=6.673×10−11 Nm2/kg2 Mearth=5.98×1024 kg Rearth=6.37×106 m
Answer» Suppose a space shuttle is in orbit about the earth at 400 km above its surface. Determine the orbital speed and the orbital period of the Space Shuttle. Use the information given below. $G = 6.673 \times 10^{- 11} N m^{2} / k g^{2}$ $M_{e a r t h} = 5.98 \times 10^{24} k g$ $R_{e a r t h} = 6.37 \times 10^{6} m$

Discussion

10.	A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms−1 and comes to a halt over a distance of 0.25m. The average force from the ground on her is close to.
Answer» A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms $^{- 1}$ and comes to a halt over a distance of 0.25m. The average force from the ground on her is close to.

Discussion

11.	A person suffering from myopia cannot see clearly beyond a distance of 1.5 m. Calculate the power of the lens of the spectacles necessary for the remedy of this defect.
Answer» A person suffering from myopia cannot see clearly beyond a distance of $1.5 m$ . Calculate the power of the lens of the spectacles necessary for the remedy of this defect.

Discussion

12.	Ultrasounds are high frequency waves. They can travel along a well-defined path even in the presence of an obstacle. The property of an ultrasound cannot be used in
Answer» Ultrasounds are high frequency waves. They can travel along a well-defined path even in the presence of an obstacle. The property of an ultrasound cannot be used in

12.

Ultrasounds are high frequency waves. They can travel along a well-defined path even in the presence of an obstacle. The property of an ultrasound cannot be used in

Answer»

Ultrasounds are high frequency waves. They can travel along a well-defined path even in the presence of an obstacle.

The property of an ultrasound cannot be used in

Discussion

13.	A one litre glass flask contains some mercury. It is found that at different temperatures the volume of air inside the flask remains the same. If coefficient of linear expression of glass is 9×10−6 (°C)−1 , while volume of expansion of mercury is 1.8×10−4 (°C)−1Then the volume of mercury in this flask is (in cc)(volume of air remains same)
Answer» A one litre glass flask contains some mercury. It is found that at different temperatures the volume of air inside the flask remains the same. If coefficient of linear expression of glass is $9 \times 10^{- 6} {(° C)}^{- 1}$ , while volume of expansion of mercury is $1.8 \times 10^{- 4} {(° C)}^{- 1}$ Then the volume of mercury in this flask is (in cc)(volume of air remains same)

Discussion

14.	Find the tension in the string?
Answer» Find the tension in the string?

14.

Find the tension in the string?

Answer»

Find the tension in the string?

Discussion

15.	The vernier scale of a micrometer has 30 divisionss,and its main scale is divided upto 0.5 degrees. The L.C. of the instrument is 1)0.2' 2)0.5' 3)1' 4)1
Answer» The vernier scale of a micrometer has 30 divisionss,and its main scale is divided upto 0.5 degrees. The L.C. of the instrument is 1)0.2' 2)0.5' 3)1' 4)1

Discussion

16.	A metal ball of material density 7800 kg/m3 issuspected to have a large number of cavities. It weighs9.8 kg when weighed directly on a balance and 1.5 kgless when immersed in water. The fraction by volumeof the cavities in the metal ball is approximately(a) 20% (b) 30% (9/16% (d) 1190
Answer» A metal ball of material density 7800 kg/m3 issuspected to have a large number of cavities. It weighs9.8 kg when weighed directly on a balance and 1.5 kgless when immersed in water. The fraction by volumeof the cavities in the metal ball is approximately(a) 20% (b) 30% (9/16% (d) 1190

Discussion

17.	A long uniform wire of resistance 9 ohm is bent into a circle. Two points of the wire at one third of the circumference apart are joined with a cell of emf 1.5 volt and internal resistance 0.5 ohm. Calculate current in the different part of circuit
Answer» A long uniform wire of resistance 9 ohm is bent into a circle. Two points of the wire at one third of the circumference apart are joined with a cell of emf 1.5 volt and internal resistance 0.5 ohm. Calculate current in the different part of circuit

Discussion

18.	A sphere has a radius of 1 m and a mass of 10 kg. The density of the sphere would be.
Answer» A sphere has a radius of 1 m and a mass of 10 kg. The density of the sphere would be.

Discussion

19.	24.Why does light bend at changing mediums (refraction) ?
Answer» 24.Why does light bend at changing mediums (refraction) ?

Discussion

20.	A current of 6 A enters one corner P of an equilateral triangle △PQR having 3 wires of resistance 21 Ω each and leaves by the corner R. The currents i1 in ampere is______.
Answer» A current of $6 A$ enters one corner $P$ of an equilateral triangle $△ P Q R$ having $3$ wires of resistance $21 Ω$ each and leaves by the corner $R$ . The currents $i_{1}$ in ampere is______.

Discussion

21.	Why freely falling bodies under gravity have weightlessness or zero gravity ?
Answer» Why freely falling bodies under gravity have weightlessness or zero gravity ?

Discussion

22.	Why do bubbles rise to the surface?
Answer» Why do bubbles rise to the surface?

Discussion

23.	The resistance of a 1 m long nichrome wire is 6 Ω. If we reduce the length of wire to 70 cm, what will be its new resistance?
Answer» The resistance of a $1 m$ long nichrome wire is $6 Ω$ . If we reduce the length of wire to $70 c m,$ what will be its new resistance?

Discussion

24.	A block of mass 4.5kg is free to move along the x-axis. It is at rest at t=0. If the force on the particle varies with time, then its kinetic energy at t=4.5s is
Answer» A block of mass 4.5kg is free to move along the x-axis. It is at rest at t=0. If the force on the particle varies with time, then its kinetic energy at t=4.5s is

Discussion

25.	A stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25m/s. Calculate when and where the two stones will meet.
Answer» A stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25m/s. Calculate when and where the two stones will meet.

Discussion

26.	If the velocity is changing at uniform rate, then the average velocity is given by the arithmetic mean of initial and final velocities. What does this statement mean?
Answer» If the velocity is changing at uniform rate, then the average velocity is given by the arithmetic mean of initial and final velocities. What does this statement mean?

Discussion

27.	Ram moves in east direction at a speed of 6m/s and shyam moves 30degrees east of north with 6m/s find relative velocity
Answer» Ram moves in east direction at a speed of 6m/s and shyam moves 30degrees east of north with 6m/s find relative velocity

Discussion

28.	When you fill a bucket with full of water and introduce an empty mug get inverted we feel that some force and does not allow the mug 2 sink y
Answer» When you fill a bucket with full of water and introduce an empty mug get inverted we feel that some force and does not allow the mug 2 sink y

Discussion

29.	a 6A fuse wire can withstand a maximum power of 18W in a circuit .the resistance of the fuse wire is
Answer» a 6A fuse wire can withstand a maximum power of 18W in a circuit .the resistance of the fuse wire is

Discussion

30.	Why two person from the Moon surface cannot hear their voice while walking on it
Answer» Why two person from the Moon surface cannot hear their voice while walking on it

Discussion

31.	A wire of length L , mass m and carrying current i is suspended from point ′O′ as shown. An another infinitely long wire carrying the same current i is at a distance L below the lower end of the wire. Given i=2 A , L=1 m and m=0.1 kg. [ln2=0.693] Find the angular acceleration of the wire just after it is released from the position shown.
Answer» A wire of length $L$ , mass $m$ and carrying current $i$ is suspended from point $^{'} O^{'}$ as shown. An another infinitely long wire carrying the same current $i$ is at a distance $L$ below the lower end of the wire. Given $i = 2 A, L = 1 m$ and $m = 0.1 kg$ . $[ln 2 = 0.693]$ Find the angular acceleration of the wire just after it is released from the position shown.

Discussion

32.	A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is:
Answer» A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is:

Discussion

33.	Do KE remains constant in uniform circulation motion
Answer» Do KE remains constant in uniform circulation motion

Discussion

34.	Which of the following is true for displacement (a) it cannot be zero (b) Its magnitudeis greaterthan the distance travelled by the object
Answer» Which of the following is true for displacement (a) it cannot be zero (b) Its magnitudeis greaterthan the distance travelled by the object

34.

Which of the following is true for displacement (a) it cannot be zero (b) Its magnitudeis greaterthan the distance travelled by the object

Answer»

Which of the following is true for displacement

(a) it cannot be zero

(b) Its magnitudeis greaterthan the distance travelled by the object

Discussion

35.	Sound waves are:
Answer» Sound waves are:

Discussion

36.	You want to lift a heavy box. The force of gravity pulls it downwards with a force of 400 N. Your father applies an upward force of 170 N from below. How much force will you have to apply to lift it upwards?(a) 220 N(b) 230 N(c) 300 N(d) less than 220 N
Answer» You want to lift a heavy box. The force of gravity pulls it downwards with a force of 400 N. Your father applies an upward force of 170 N from below. How much force will you have to apply to lift it upwards? (a) 220 N (b) 230 N (c) 300 N (d) less than 220 N

Discussion

37.	In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.(i) How much work does he do in lifting one box?(ii) How much energy is transferred when one box is lifted?(iii) If the man lifts 4 boxes per minute, at what power is he working? (g = 10 m s-2)
Answer» In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m. (i) How much work does he do in lifting one box? (ii) How much energy is transferred when one box is lifted? (iii) If the man lifts 4 boxes per minute, at what power is he working? (g = 10 m s^-2)

Discussion

38.	17. In a capillary tube containing water how does the surface tension force acts in which direction?how surface tension can be increased?
Answer» 17. In a capillary tube containing water how does the surface tension force acts in which direction?how surface tension can be increased?

Discussion

39.	The velocity of point A on the rod is 2 ms−1 (leftwards) at the instant shown in fig. The velocity of the point B on the rod at this instant is
Answer» The velocity of point A on the rod is 2 $m s^{- 1}$ (leftwards) at the instant shown in fig. The velocity of the point B on the rod at this instant is

39.

The velocity of point A on the rod is 2 ms−1 (leftwards) at the instant shown in fig. The velocity of the point B on the rod at this instant is

Answer»

The velocity of point A on the rod is 2 $m s^{- 1}$ (leftwards) at the instant shown in fig. The velocity of the point B on the rod at this instant is

Discussion

40.	If a particle is speeding up, acceleration is in the direction of velocity. If it's speed is decreasing acceleration is in the direction opposite to that of velocity. This statement is independent of the choice of origin and the axis.What does the above statement mean?
Answer» If a particle is speeding up, acceleration is in the direction of velocity. If it's speed is decreasing acceleration is in the direction opposite to that of velocity. This statement is independent of the choice of origin and the axis. What does the above statement mean?

Discussion

41.	Moment of a force of magnitude 20N acting along position x direction at 3m,0,0 about the point 0,2,0 is?
Answer» Moment of a force of magnitude 20N acting along position x direction at 3m,0,0 about the point 0,2,0 is?

Discussion

42.	A and B are two concentric circular conductors with centre O and carrying the currents X AND Y if the ratio of their radii is 1:2 and flux densities on O due to A and B ARE IN THE RATIO 1:3 THEN FIND THE RATIO OF CURRENTS ON THE CIRCULAR LOOP
Answer» A and B are two concentric circular conductors with centre O and carrying the currents X AND Y if the ratio of their radii is 1:2 and flux densities on O due to A and B ARE IN THE RATIO 1:3 THEN FIND THE RATIO OF CURRENTS ON THE CIRCULAR LOOP

Discussion

43.	Derive the equations of motion for constant jerk.
Answer» Derive the equations of motion for constant jerk.

Discussion

44.	The Rath Yatra at Puri is celebrated in honour of which Hindu deity?
Answer» The Rath Yatra at Puri is celebrated in honour of which Hindu deity?

Discussion

45.	A beaker of 2 litre is fully filled with a liquid. The value of the relative density of the liquid is 0.7. Find out the value of mass of the liquid.(Density of water =1 g cm−3 )
Answer» A beaker of 2 litre is fully filled with a liquid. The value of the relative density of the liquid is $0.7$ . Find out the value of mass of the liquid. (Density of water $= 1 g c m^{- 3}$ )

Discussion

46.	The current supplied by the battery in the circuit shown in figure is
Answer» The current supplied by the battery in the circuit shown in figure is

Discussion

47.	The gravitational field due to a particle of mass m is given by E=3i+4j. What should be the path for which net work done by the gravitational field should be zero?
Answer» The gravitational field due to a particle of mass m is given by E=3i+4j. What should be the path for which net work done by the gravitational field should be zero?

Discussion

48.	A ball of mass 0.25kg is moving horizontally with a uniform velocity of 25m/s. Calculate the Kinetic energy possessed by the Ball.
Answer» A ball of mass 0.25kg is moving horizontally with a uniform velocity of 25m/s. Calculate the Kinetic energy possessed by the Ball.

Discussion

49.	When an object is thrown vertically upward, on reaching the highest point, its value of acceleration due to gravity would be.
Answer» When an object is thrown vertically upward, on reaching the highest point, its value of acceleration due to gravity would be.

Discussion

50.	How much below the surface of the earth does the acceleration due to gravity reduces by 36% of its value on the surface of Earth
Answer» How much below the surface of the earth does the acceleration due to gravity reduces by 36% of its value on the surface of Earth

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

18.A wire of resistance 5 ohm is melted and cost again into a new wire of half the radius. FIND the resistance of the new wire.

With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take a=9.8 ms−2)

From the top of a tower 19.6 m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of 45° with horizontal, then initial velocity of the ball is :-1) 9.8 m/s2) 4.9 m/s3) 14.7 m/s4) 2.8 m/s

Question 24 Two stones are thrown vertically upwards simultaneously with their initial velocities u1 and u2 respectively. Prove that the heights reached by them would be in the ration of u21 ; u22 ( Assume upward acceleration is –g and downward acceleration to be +g).

Two wires of same materials has length ratio 1:2 and mass ratio 2:3. What will be their resistance ratio

Water is used to cool radiators of engines, because

a physical quantity is measured and its value is found to be nu where n=numerical value, u=unit. prove that n is inversely proportional to u.

Focal length f of a spherical mirror, is given by. 1where u and v are object and imagepositions respectively then choose the correctrelation.- 1AfAuAV+fAf(2)+4vuAu Av+Holy11Af(3)V4Au Av++u vuvAFAf Av Au(4) 2v2uP

Suppose a space shuttle is in orbit about the earth at 400 km above its surface. Determine the orbital speed and the orbital period of the Space Shuttle. Use the information given below. G=6.673×10−11 Nm2/kg2 Mearth=5.98×1024 kg Rearth=6.37×106 m

A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms−1 and comes to a halt over a distance of 0.25m. The average force from the ground on her is close to.

A person suffering from myopia cannot see clearly beyond a distance of 1.5 m. Calculate the power of the lens of the spectacles necessary for the remedy of this defect.

Ultrasounds are high frequency waves. They can travel along a well-defined path even in the presence of an obstacle. The property of an ultrasound cannot be used in

Find the tension in the string?

The vernier scale of a micrometer has 30 divisionss,and its main scale is divided upto 0.5 degrees. The L.C. of the instrument is 1)0.2' 2)0.5' 3)1' 4)1

A metal ball of material density 7800 kg/m3 issuspected to have a large number of cavities. It weighs9.8 kg when weighed directly on a balance and 1.5 kgless when immersed in water. The fraction by volumeof the cavities in the metal ball is approximately(a) 20% (b) 30% (9/16% (d) 1190

A long uniform wire of resistance 9 ohm is bent into a circle. Two points of the wire at one third of the circumference apart are joined with a cell of emf 1.5 volt and internal resistance 0.5 ohm. Calculate current in the different part of circuit

A sphere has a radius of 1 m and a mass of 10 kg. The density of the sphere would be.

24.Why does light bend at changing mediums (refraction) ?

A current of 6 A enters one corner P of an equilateral triangle △PQR having 3 wires of resistance 21 Ω each and leaves by the corner R. The currents i1 in ampere is______.

Why freely falling bodies under gravity have weightlessness or zero gravity ?

Why do bubbles rise to the surface?

The resistance of a 1 m long nichrome wire is 6 Ω. If we reduce the length of wire to 70 cm, what will be its new resistance?

A block of mass 4.5kg is free to move along the x-axis. It is at rest at t=0. If the force on the particle varies with time, then its kinetic energy at t=4.5s is

A stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25m/s. Calculate when and where the two stones will meet.

If the velocity is changing at uniform rate, then the average velocity is given by the arithmetic mean of initial and final velocities. What does this statement mean?

Ram moves in east direction at a speed of 6m/s and shyam moves 30degrees east of north with 6m/s find relative velocity

When you fill a bucket with full of water and introduce an empty mug get inverted we feel that some force and does not allow the mug 2 sink y

a 6A fuse wire can withstand a maximum power of 18W in a circuit .the resistance of the fuse wire is

Why two person from the Moon surface cannot hear their voice while walking on it

A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is:

Do KE remains constant in uniform circulation motion

Which of the following is true for displacement (a) it cannot be zero (b) Its magnitudeis greaterthan the distance travelled by the object

Sound waves are:

You want to lift a heavy box. The force of gravity pulls it downwards with a force of 400 N. Your father applies an upward force of 170 N from below. How much force will you have to apply to lift it upwards?(a) 220 N(b) 230 N(c) 300 N(d) less than 220 N

In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.(i) How much work does he do in lifting one box?(ii) How much energy is transferred when one box is lifted?(iii) If the man lifts 4 boxes per minute, at what power is he working? (g = 10 m s-2)

17. In a capillary tube containing water how does the surface tension force acts in which direction?how surface tension can be increased?

The velocity of point A on the rod is 2 ms−1 (leftwards) at the instant shown in fig. The velocity of the point B on the rod at this instant is

If a particle is speeding up, acceleration is in the direction of velocity. If it's speed is decreasing acceleration is in the direction opposite to that of velocity. This statement is independent of the choice of origin and the axis.What does the above statement mean?

Moment of a force of magnitude 20N acting along position x direction at 3m,0,0 about the point 0,2,0 is?

A and B are two concentric circular conductors with centre O and carrying the currents X AND Y if the ratio of their radii is 1:2 and flux densities on O due to A and B ARE IN THE RATIO 1:3 THEN FIND THE RATIO OF CURRENTS ON THE CIRCULAR LOOP

Derive the equations of motion for constant jerk.

The Rath Yatra at Puri is celebrated in honour of which Hindu deity?

A beaker of 2 litre is fully filled with a liquid. The value of the relative density of the liquid is 0.7. Find out the value of mass of the liquid.(Density of water =1 g cm−3 )

The current supplied by the battery in the circuit shown in figure is

The gravitational field due to a particle of mass m is given by E=3i+4j. What should be the path for which net work done by the gravitational field should be zero?

A ball of mass 0.25kg is moving horizontally with a uniform velocity of 25m/s. Calculate the Kinetic energy possessed by the Ball.

When an object is thrown vertically upward, on reaching the highest point, its value of acceleration due to gravity would be.

How much below the surface of the earth does the acceleration due to gravity reduces by 36% of its value on the surface of Earth