13232 + Interview Questions in Physics Page 109 InterviewSolution

5401.	What is irregular reflection? Give an example.
Answer» What is irregular reflection? Give an example.

Discussion

5402.	A 2000 kg car moves down a level highway under the actions of two forces. A 1000 N forward force exerted on the drive wheels by the road and a 950 N resistive force. Find the net work done on the car after it has moved a distance of 20 m, assuming that it starts from rest.
Answer» A 2000 kg car moves down a level highway under the actions of two forces. A 1000 N forward force exerted on the drive wheels by the road and a 950 N resistive force. Find the net work done on the car after it has moved a distance of 20 m, assuming that it starts from rest.

5402.

A 2000 kg car moves down a level highway under the actions of two forces. A 1000 N forward force exerted on the drive wheels by the road and a 950 N resistive force. Find the net work done on the car after it has moved a distance of 20 m, assuming that it starts from rest.

Answer»

A 2000 kg car moves down a level highway under the actions of two forces. A 1000 N forward force exerted on the drive wheels by the road and a 950 N resistive force. Find the net work done on the car after it has moved a distance of 20 m, assuming that it starts from rest.

Discussion

5403.	Why goggles (Sun glasses) have zero power even though their surfaces are curved? [2 MARKS]
Answer» Why goggles (Sun glasses) have zero power even though their surfaces are curved? [2 MARKS]

Discussion

5404.	21. A student measured the length of a rod and wrote it as 3.50 cm . Which instrument did he used to measure it? (1) a meter scale with least count 0.1 cm (2) a vernier calliper where the 10 division in vernier scale matches with 9 division in main scale and main scale has 10 division in 1 cm (3) a screw gauge having 100 division in the circular scale and pitch as 1 mm (4) a screw gauge having 50 divisions in the circular scale and pitch as 1 mm Explain.
Answer» 21. A student measured the length of a rod and wrote it as 3.50 cm . Which instrument did he used to measure it? (1) a meter scale with least count 0.1 cm (2) a vernier calliper where the 10 division in vernier scale matches with 9 division in main scale and main scale has 10 division in 1 cm (3) a screw gauge having 100 division in the circular scale and pitch as 1 mm (4) a screw gauge having 50 divisions in the circular scale and pitch as 1 mm Explain.

Discussion

5405.	What are the conditions required to hear a distinct echo?
Answer» What are the conditions required to hear a distinct echo?

Discussion

5406.	Which of the following is represented by 'v'?
Answer» Which of the following is represented by 'v'?

Discussion

5407.	An object of mass 1. 5 kg is lifted to a height of 2 m by a man who imparts a constant force of 100n.find work done by gravity in process.(answer isn't 200j or 30j)
Answer» An object of mass 1. 5 kg is lifted to a height of 2 m by a man who imparts a constant force of 100n.find work done by gravity in process.(answer isn't 200j or 30j)

Discussion

5408.	what is the definition of newton's law of gravity
Answer» what is the definition of newton's law of gravity

Discussion

5409.	A bright source S is kept on the principal axis of a concave mirror of focal length f = 20 cm at a distance d = 30 cm from its pole. Find the distance D in cm in front of the concave mirror where a plane mirror should be placed so that the ray, after being reflected first at the concave mirror and then by the plane mirror, returns to point S.
Answer» A bright source S is kept on the principal axis of a concave mirror of focal length f = 20 cm at a distance d = 30 cm from its pole. Find the distance D in cm in front of the concave mirror where a plane mirror should be placed so that the ray, after being reflected first at the concave mirror and then by the plane mirror, returns to point S.

Discussion

5410.	Thrust acting on the bottom surface of a tank having dimensions 4 m × 4 m × 4 m when fully filled with water of density 103 kg m-3 is
Answer» Thrust acting on the bottom surface of a tank having dimensions 4 m × 4 m × 4 m when fully filled with water of density 103 kg m-3 is

Discussion

5411.	a particle experience an acceleration a = 4e^-3t m/s^2 . is initial velocity of particle is 2m/s then the velocity of particle when acceleration is zero ?
Answer» a particle experience an acceleration a = 4e^-3t m/s^2 . is initial velocity of particle is 2m/s then the velocity of particle when acceleration is zero ?

Discussion

5412.	Discuss the effect of temperature on the velocity of sound in gases. State Newton second Law of Motion. On its basis derive the relation between force and acceleration
Answer» Discuss the effect of temperature on the velocity of sound in gases. State Newton second Law of Motion. On its basis derive the relation between force and acceleration

Discussion

5413.	Find the equivalent resistance between A and B.
Answer» Find the equivalent resistance between $A$ and $B$ .

Discussion

5414.	a planet has twice the mass of earth and of identical size.what will be the height above the surface of the planet where its acceleration due to gravity reduces by 36% of its value on earth surfac
Answer» a planet has twice the mass of earth and of identical size.what will be the height above the surface of the planet where its acceleration due to gravity reduces by 36% of its value on earth surfac

Discussion

5415.	We have an electric kettle rated at (60v, 5A). We have a mass of 10 kg that is placed such that the steam in the kettle is used to drive the mass in the horizontal direction.If the kettle runs for 5 minutes.What is the velocity of mass attained?
Answer» We have an electric kettle rated at (60v, 5A). We have a mass of 10 kg that is placed such that the steam in the kettle is used to drive the mass in the horizontal direction.If the kettle runs for 5 minutes.What is the velocity of mass attained?

Discussion

5416.	A bus starts from the stop and takes 50 seconds to attain the speed of 10ms. If the mass of the bus along with the passengers is 10000 kg, the force applied (in N) by the engine of the bus to attain the speed of 10ms is ___ N.
Answer» A bus starts from the stop and takes $50$ seconds to attain the speed of $10$ $\frac{m}{s}$ . If the mass of the bus along with the passengers is $10000$ kg, the force applied (in N) by the engine of the bus to attain the speed of 10 $\frac{m}{s}$ is ___ N.

Discussion

5417.	An object placed 2 cm from a plane mirror is shifted by 0.5 cm away from the mirror. What is the distance between the object and its image?
Answer» An object placed 2 cm from a plane mirror is shifted by 0.5 cm away from the mirror. What is the distance between the object and its image?

Discussion

5418.	Fill in the blanks with the proper words from the brackets.(stationary, zero, changing, constant, displacement, velocity, speed, acceleration, stationary but not zero, increases)(a) If a body traverses a distance in direct proportion to the time, the speed of the body is ............... .(b) If a body is moving with a constant velocity its acceleration is .......... .(c) .............. is a scalar quantity.(d) ............. is the distance traversed by a body in a particular direction in unit time.
Answer» Fill in the blanks with the proper words from the brackets. (stationary, zero, changing, constant, displacement, velocity, speed, acceleration, stationary but not zero, increases) (a) If a body traverses a distance in direct proportion to the time, the speed of the body is ............... . (b) If a body is moving with a constant velocity its acceleration is .......... . (c) .............. is a scalar quantity. (d) ............. is the distance traversed by a body in a particular direction in unit time.

Discussion

5419.	6. the si unit of density is
Answer» 6. the si unit of density is

Discussion

5420.	A car accelerates from 15km/hr to 60km/hr in 300 seconds.Find the dis†an ce travelled by the car during this time
Answer» A car accelerates from 15km/hr to 60km/hr in 300 seconds.Find the dis†an ce travelled by the car during this time

Discussion

5421.	How to derive the case of simple pendulum with conservation of energy ?
Answer» How to derive the case of simple pendulum with conservation of energy ?

Discussion

5422.	A sea diver at depth of 45 m exhales a bubble of air that is 1.0 cm in radius. Assuming the ideal behaviour, find out radius of this bubble as it breaks at the surface of water?
Answer» A sea diver at depth of 45 m exhales a bubble of air that is 1.0 cm in radius. Assuming the ideal behaviour, find out radius of this bubble as it breaks at the surface of water?

Discussion

5423.	If power is increased by 50% and work done is constant, then the time taken is reduced by:
Answer» If power is increased by $50 %$ and work done is constant, then the time taken is reduced by:

Discussion

5424.	If force (F), length (L) and time (T) are taken as the fundamental quantities. Then what will be the dimension of density :
Answer» If force ( $F$ ), length ( $L$ ) and time ( $T)$ are taken as the fundamental quantities. Then what will be the dimension of density :

Discussion

5425.	A satellite X is launched into a circular orbit of radius R around the earth while a second satellite Y is launched into an orbit of radius 4R. The ratio of the time periods of Y to X is what ?
Answer» A satellite $X$ is launched into a circular orbit of radius $R$ around the earth while a second satellite $Y$ is launched into an orbit of radius $4 R$ . The ratio of the time periods of $Y$ to $X$ is what ?

Discussion

5426.	In the nuclear fusion reaction,1H2+1H3→2He4+0n1The repulsive potential energy between the two fusing nuclei is 7.7×10−14 J. The temperature to which the gas must be heated is nearly(Boltzmen constant K=1.38×10−23 JK−1)
Answer» In the nuclear fusion reaction, $_{1} H^{2} +_{1} H^{3} \to_{2} {He}^{4} +_{0} n^{1}$ The repulsive potential energy between the two fusing nuclei is $7.7 \times 10^{- 14} J$ . The temperature to which the gas must be heated is nearly $(Boltzmen constant K = 1.38 \times 10^{- 23} {JK}^{- 1})$

Discussion

5427.	A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint: 1 tonne = 1000 kg).
Answer» A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint: 1 tonne = 1000 kg).

Discussion

5428.	Identify the condition, which will form enlarged, virtual and erect image?
Answer» Identify the condition, which will form enlarged, virtual and erect image?

Discussion

5429.	झलकारीबाई, लक्ष्मीबाई की हमशक्ल थी। तुम्हारे विचार से हमशक्ल होने के क्या-क्या लाभ या हानि हो सकते हैं?
Answer» झलकारीबाई, लक्ष्मीबाई की हमशक्ल थी। तुम्हारे विचार से हमशक्ल होने के क्या-क्या लाभ या हानि हो सकते हैं?

Discussion

5430.	When the electric field in air reaches a value of 106 V/m, air starts conducting and the charged body discharges. We have a metal ball with a charge of 0.1 C. What can be its minimum radius in meter so that it does not discharge?
Answer» When the electric field in air reaches a value of $10^{6}$ V/m, air starts conducting and the charged body discharges. We have a metal ball with a charge of 0.1 C. What can be its minimum radius in meter so that it does not discharge?

Discussion

5431.	Question 4Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.
Answer» Question 4 Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

Discussion

5432.	33.Graph of temperature vs resistance of metalloids,semi conductor ,superconductor,metal and non metal
Answer» 33.Graph of temperature vs resistance of metalloids,semi conductor ,superconductor,metal and non metal

Discussion

5433.	In an NPN transistor circuit, the collector current is 10 mA. If 90 % of the electrons emitted reach the collector, the emitter current (IE) and base current (IB) respectively are
Answer» In an NPN transistor circuit, the collector current is $10 mA$ . If $90 %$ of the electrons emitted reach the collector, the emitter current $(I_{E})$ and base current $(I_{B})$ respectively are

Discussion

5434.	31.The tension T in the string shown in figure is ?
Answer» 31.The tension T in the string shown in figure is ?

Discussion

5435.	define 2nd law of kepler regarding planetary motion.
Answer» define 2nd law of kepler regarding planetary motion.

Discussion

5436.	Question 1 An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.
Answer» Question 1 An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Discussion

5437.	Question 20 A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
Answer» Question 20 A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

Discussion

5438.	if radius of earth is r then then the height is h at which the value of g becomes one fourth is a. 3r b. 2r c. 4r
Answer» if radius of earth is r then then the height is h at which the value of g becomes one fourth is a. 3r b. 2r c. 4r

Discussion

5439.	4) None3) 15 s 100 cm10. A car moving with constant accelerationcovers the distance between two points 180 mapart in 6 sec. Its speed as it passes the secondpoint is 45 m/s. What is its acceleration and itsspeed at the first point1) -5 m/s 15 m/s3) -5 m/s-15 m/s2)-15 m/s2 5 m/s4) 5 m/s156115 m/s
Answer» 4) None3) 15 s 100 cm10. A car moving with constant accelerationcovers the distance between two points 180 mapart in 6 sec. Its speed as it passes the secondpoint is 45 m/s. What is its acceleration and itsspeed at the first point1) -5 m/s 15 m/s3) -5 m/s-15 m/s2)-15 m/s2 5 m/s4) 5 m/s156115 m/s

Discussion

5440.	nta body falls freeely from the top of a tower. it covers 36% of the total height in the last second before striking the ground level.the height of tower is??/n
Answer» nta body falls freeely from the top of a tower. it covers 36% of the total height in the last second before striking the ground level.the height of tower is??/n

Discussion

5441.	Identify the symbol of electric switch from the following:
Answer» Identify the symbol of electric switch from the following:

Discussion

5442.	The position of a body moving along x-axis at time to is given by x = (t^2 - 4t +6)m. The distance travelled by body in time interval t = 0 to t = 3s is
Answer» The position of a body moving along x-axis at time to is given by x = (t^2 - 4t +6)m. The distance travelled by body in time interval t = 0 to t = 3s is

Discussion

5443.	Q2. Consider the following statements about Tiangong-1/ Heavenly Palace 1: 1. It is a prototype space station. 2. It is launched by China. Which of the above statements are correct?
Answer» Q2. Consider the following statements about Tiangong-1/ Heavenly Palace 1: 1. It is a prototype space station. 2. It is launched by China. Which of the above statements are correct?

5443.

Q2. Consider the following statements about Tiangong-1/ Heavenly Palace 1: 1. It is a prototype space station. 2. It is launched by China. Which of the above statements are correct?

Answer»

Q2. Consider the following statements about Tiangong-1/ Heavenly Palace 1:

1. It is a prototype space station.

2. It is launched by China.

Which of the above statements are correct?

Discussion

5444.	Among a car and a ship which object has more inertia and why?
Answer» Among a car and a ship which object has more inertia and why?

Discussion

5445.	11.The first Ionisation potential values of Li, Be and C are 5.4eV/atom 9.32eV/atom and 11.26eV/atom. The first ionistion potential of Boron is- 1) 13.6eV/atom 2) 8.29eV/atom 3) 14.5eV/atom 4) 21.5eV/atom
Answer» 11.The first Ionisation potential values of Li, Be and C are 5.4eV/atom 9.32eV/atom and 11.26eV/atom. The first ionistion potential of Boron is- 1) 13.6eV/atom 2) 8.29eV/atom 3) 14.5eV/atom 4) 21.5eV/atom

Discussion

5446.	Place a ringing bell in a closed jar and then remove air completely from the jar through a vacuum pump, as shown below in figure (a). Can we hear the ringing sound when the switch is turned on? Give reason for your answer. Fig. (a)
Answer» Place a ringing bell in a closed jar and then remove air completely from the jar through a vacuum pump, as shown below in figure (a). Can we hear the ringing sound when the switch is turned on? Give reason for your answer. Fig. (a)

Discussion

5447.	what is the difference between virtual object and virtual image
Answer» what is the difference between virtual object and virtual image

Discussion

5448.	Let’s say a thief is running on a train with 12 km/h. The police car is moving with 80 km/h. If speed of the train is 60 km/h. What is the speed of thief w.r.t police car?
Answer» Let’s say a thief is running on a train with 12 km/h. The police car is moving with 80 km/h. If speed of the train is 60 km/h. What is the speed of thief w.r.t police car?

Discussion

5449.	Explain the following : (a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart. (b) Several soft iron pins can cling, one below the other, from the pole of a magnet. (c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.
Answer» Explain the following : (a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart. (b) Several soft iron pins can cling, one below the other, from the pole of a magnet. (c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.

5449.

Explain the following : (a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart. (b) Several soft iron pins can cling, one below the other, from the pole of a magnet. (c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.

Answer»

Explain the following :

(a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart.

(b) Several soft iron pins can cling, one below the other, from the pole of a magnet.

(c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.

Discussion

5450.	28. Relation between velocity and displacemeparticle is 4v2 =25 x2 then find time perio34oscillation.(1) π s(2) 2t S(3) 3t S(4) 4T $
Answer» 28. Relation between velocity and displacemeparticle is 4v2 =25 x2 then find time perio34oscillation.(1) π s(2) 2t S(3) 3t S(4) 4T $

Discussion

Explore topic-wise InterviewSolutions in .

What is irregular reflection? Give an example.

A 2000 kg car moves down a level highway under the actions of two forces. A 1000 N forward force exerted on the drive wheels by the road and a 950 N resistive force. Find the net work done on the car after it has moved a distance of 20 m, assuming that it starts from rest.

Why goggles (Sun glasses) have zero power even though their surfaces are curved? [2 MARKS]

What are the conditions required to hear a distinct echo?

Which of the following is represented by 'v'?

An object of mass 1. 5 kg is lifted to a height of 2 m by a man who imparts a constant force of 100n.find work done by gravity in process.(answer isn't 200j or 30j)

what is the definition of newton's law of gravity

Thrust acting on the bottom surface of a tank having dimensions 4 m × 4 m × 4 m when fully filled with water of density 103 kg m-3 is

a particle experience an acceleration a = 4e^-3t m/s^2 . is initial velocity of particle is 2m/s then the velocity of particle when acceleration is zero ?

Discuss the effect of temperature on the velocity of sound in gases. State Newton second Law of Motion. On its basis derive the relation between force and acceleration

Find the equivalent resistance between A and B.

a planet has twice the mass of earth and of identical size.what will be the height above the surface of the planet where its acceleration due to gravity reduces by 36% of its value on earth surfac

We have an electric kettle rated at (60v, 5A). We have a mass of 10 kg that is placed such that the steam in the kettle is used to drive the mass in the horizontal direction.If the kettle runs for 5 minutes.What is the velocity of mass attained?

A bus starts from the stop and takes 50 seconds to attain the speed of 10ms. If the mass of the bus along with the passengers is 10000 kg, the force applied (in N) by the engine of the bus to attain the speed of 10ms is ___ N.

An object placed 2 cm from a plane mirror is shifted by 0.5 cm away from the mirror. What is the distance between the object and its image?

6. the si unit of density is

A car accelerates from 15km/hr to 60km/hr in 300 seconds.Find the dis†an ce travelled by the car during this time

How to derive the case of simple pendulum with conservation of energy ?

A sea diver at depth of 45 m exhales a bubble of air that is 1.0 cm in radius. Assuming the ideal behaviour, find out radius of this bubble as it breaks at the surface of water?

If power is increased by 50% and work done is constant, then the time taken is reduced by:

If force (F), length (L) and time (T) are taken as the fundamental quantities. Then what will be the dimension of density :

A satellite X is launched into a circular orbit of radius R around the earth while a second satellite Y is launched into an orbit of radius 4R. The ratio of the time periods of Y to X is what ?

In the nuclear fusion reaction,1H2+1H3→2He4+0n1The repulsive potential energy between the two fusing nuclei is 7.7×10−14 J. The temperature to which the gas must be heated is nearly(Boltzmen constant K=1.38×10−23 JK−1)

A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint: 1 tonne = 1000 kg).

Identify the condition, which will form enlarged, virtual and erect image?

झलकारीबाई, लक्ष्मीबाई की हमशक्ल थी। तुम्हारे विचार से हमशक्ल होने के क्या-क्या लाभ या हानि हो सकते हैं?

When the electric field in air reaches a value of 106 V/m, air starts conducting and the charged body discharges. We have a metal ball with a charge of 0.1 C. What can be its minimum radius in meter so that it does not discharge?

Question 4Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

33.Graph of temperature vs resistance of metalloids,semi conductor ,superconductor,metal and non metal

In an NPN transistor circuit, the collector current is 10 mA. If 90 % of the electrons emitted reach the collector, the emitter current (IE) and base current (IB) respectively are

31.The tension T in the string shown in figure is ?

define 2nd law of kepler regarding planetary motion.

Question 1 An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Question 20 A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

if radius of earth is r then then the height is h at which the value of g becomes one fourth is a. 3r b. 2r c. 4r

4) None3) 15 s 100 cm10. A car moving with constant accelerationcovers the distance between two points 180 mapart in 6 sec. Its speed as it passes the secondpoint is 45 m/s. What is its acceleration and itsspeed at the first point1) -5 m/s 15 m/s3) -5 m/s-15 m/s2)-15 m/s2 5 m/s4) 5 m/s156115 m/s

nta body falls freeely from the top of a tower. it covers 36% of the total height in the last second before striking the ground level.the height of tower is??/n

Identify the symbol of electric switch from the following:

The position of a body moving along x-axis at time to is given by x = (t^2 - 4t +6)m. The distance travelled by body in time interval t = 0 to t = 3s is

Q2. Consider the following statements about Tiangong-1/ Heavenly Palace 1: 1. It is a prototype space station. 2. It is launched by China. Which of the above statements are correct?

Among a car and a ship which object has more inertia and why?

11.The first Ionisation potential values of Li, Be and C are 5.4eV/atom 9.32eV/atom and 11.26eV/atom. The first ionistion potential of Boron is- 1) 13.6eV/atom 2) 8.29eV/atom 3) 14.5eV/atom 4) 21.5eV/atom

Place a ringing bell in a closed jar and then remove air completely from the jar through a vacuum pump, as shown below in figure (a). Can we hear the ringing sound when the switch is turned on? Give reason for your answer. Fig. (a)

what is the difference between virtual object and virtual image

Let’s say a thief is running on a train with 12 km/h. The police car is moving with 80 km/h. If speed of the train is 60 km/h. What is the speed of thief w.r.t police car?

28. Relation between velocity and displacemeparticle is 4v2 =25 x2 then find time perio34oscillation.(1) π s(2) 2t S(3) 3t S(4) 4T $