6277 + Interview Questions in Physics Page 4 InterviewSolution

151.	why object in convex mirror are smaller ? Explain with the help of diagram
Answer» why object in convex mirror are smaller ? Explain with the help of diagram

Discussion

152.	A ray OA is incident upon a smooth surface POQ. It is reflected back along OB. A normal ON is drawn perpendicular to the surface at O (the point of incidence). The value of ∠AOP is60∘. Find the value of the angle of reflection.
Answer» A ray OA is incident upon a smooth surface POQ. It is reflected back along OB. A normal ON is drawn perpendicular to the surface at O (the point of incidence). The value of $∠ A O P$ is $60^{\circ}$ . Find the value of the angle of reflection.

Discussion

153.	If a body is moving in a straight line but it keeps changing its speed, then the motion of the body is:
Answer» If a body is moving in a straight line but it keeps changing its speed, then the motion of the body is:

Discussion

154.	A container is filled with liquid up to 20 cm. The pressure at the bottom of the liquid column is 10 Pa. Find the density of the liquid. GIven: Acceleration due to gravity, g = 10 m/s2.
Answer» A container is filled with liquid up to $20 c m$ . The pressure at the bottom of the liquid column is $10 P a$ . Find the density of the liquid. GIven: Acceleration due to gravity, g = $10 m / s^{2}$ .

154.

A container is filled with liquid up to 20 cm. The pressure at the bottom of the liquid column is 10 Pa. Find the density of the liquid. GIven: Acceleration due to gravity, g = 10 m/s2.

Answer»

A container is filled with liquid up to $20 c m$ . The pressure at the bottom of the liquid column is $10 P a$ . Find the density of the liquid.

GIven: Acceleration due to gravity, g = $10 m / s^{2}$ .

Discussion

155.	the momentum of electron with energy 20ev is
Answer» the momentum of electron with energy 20ev is

Discussion

156.	Calculate the ratio of average kinetic energy of one molecule of diatomic gas (rigid)and diatomic gas (elastic) at 150^°C
Answer» Calculate the ratio of average kinetic energy of one molecule of diatomic gas (rigid)and diatomic gas (elastic) at 150^°C

Discussion

157.	Which region is present in the shadow formed by a point source of light?
Answer» Which region is present in the shadow formed by a point source of light?

Discussion

158.	Question 14An electric heater is rated 1500 W. How much energy does it use in 10 hours?
Answer» Question 14 An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Discussion

159.	A particle moves perpendicularly towards a plane mirror with a constant speed of 4cm/s. What is the speed of the image observed by an observer moving with 2cm/s along the same direction? Mirror is also moving with a speed of 10cm/s in the opposite direction
Answer» A particle moves perpendicularly towards a plane mirror with a constant speed of 4cm/s. What is the speed of the image observed by an observer moving with 2cm/s along the same direction? Mirror is also moving with a speed of 10cm/s in the opposite direction

Discussion

160.	Define electrical conductivity. Which of the following do not conduct electricity.Carbon, Aluminium, Copper, Glass, Wood and Iron.
Answer» Define electrical conductivity. Which of the following do not conduct electricity. Carbon, Aluminium, Copper, Glass, Wood and Iron.

160.

Define electrical conductivity. Which of the following do not conduct electricity.Carbon, Aluminium, Copper, Glass, Wood and Iron.

Answer»

Define electrical conductivity. Which of the following do not conduct electricity.

Carbon, Aluminium, Copper, Glass, Wood and Iron.

Discussion

161.	Question 12 The figure below shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?
Answer» Question 12 The figure below shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?

Discussion

162.	A charge of 8 microcoulomb moving with a velocity of (2i + 3j)m/s enters a magnetic field of (6i + 9j)T. Find the force acting on the charge.
Answer» A charge of 8 microcoulomb moving with a velocity of (2i + 3j)m/s enters a magnetic field of (6i + 9j)T. Find the force acting on the charge.

Discussion

163.	Which of the following describes the common domestic power supplied in India?
Answer» Which of the following describes the common domestic power supplied in India?

Discussion

164.	Why does bursting of a balloon make a lot of sound ?
Answer» Why does bursting of a balloon make a lot of sound ?

Discussion

165.	True or false? (a) When two substances are rubbed on each other, like charges are developed on each. (b) An atom may have either a positive or a negative charge. (c) Substances that allow the flow of electricity are called good conductors. (d) If the leaves of the electroscope spread only a little, the charge on them is greater.
Answer» True or false? (a) When two substances are rubbed on each other, like charges are developed on each. (b) An atom may have either a positive or a negative charge. (c) Substances that allow the flow of electricity are called good conductors. (d) If the leaves of the electroscope spread only a little, the charge on them is greater.

165.

True or false? (a) When two substances are rubbed on each other, like charges are developed on each. (b) An atom may have either a positive or a negative charge. (c) Substances that allow the flow of electricity are called good conductors. (d) If the leaves of the electroscope spread only a little, the charge on them is greater.

Answer»

True or false?

(a) When two substances are rubbed on each other, like charges are developed on each.

(b) An atom may have either a positive or a negative charge.

(c) Substances that allow the flow of electricity are called good conductors.

(d) If the leaves of the electroscope spread only a little, the charge on them is greater.

Discussion

166.	We have to make a battery from the following arrangement. Select the correct statement(s):
Answer» We have to make a battery from the following arrangement. Select the correct statement(s):

166.

We have to make a battery from the following arrangement. Select the correct statement(s):

Answer»

We have to make a battery from the following arrangement. Select the correct statement(s):

Discussion

167.	A rubber ball is taken to depth 1 km inside water so that its volume reduces by 0.05%. What is the bulk modulus for rubber.
Answer» A rubber ball is taken to depth 1 km inside water so that its volume reduces by 0.05%. What is the bulk modulus for rubber.

Discussion

168.	The phenomenon of expansion of ___ due to heat is used in making a thermometer.
Answer» The phenomenon of expansion of ___ due to heat is used in making a thermometer.

Discussion

169.	Are hurricanes stronger or cyclones and typhoons stronger?
Answer» Are hurricanes stronger or cyclones and typhoons stronger?

Discussion

170.	A cell of negligible resistance and emf 2 volt is connected to series combination of 2, 3 and 5 ohm .The potential difference in volt between the terminals of 3 ohm resistance will be
Answer» A cell of negligible resistance and emf 2 volt is connected to series combination of 2, 3 and 5 ohm .The potential difference in volt between the terminals of 3 ohm resistance will be

Discussion

171.	Fill the missing word in the blank spaces in the following statements:(a) Wind is ––––– air.(b) Near the earth’s surface ––––– air rises up whereas ––––– air comes down.(c) Air moves from a region of ––––– pressure to a region of ––––– pressure.
Answer» Fill the missing word in the blank spaces in the following statements: (a) Wind is $- --- -$ air. (b) Near the earth’s surface $- --- -$ air rises up whereas $- --- -$ air comes down. (c) Air moves from a region of $- --- -$ pressure to a region of $- --- -$ pressure.

Discussion

172.	If A vector + B vector + C vector = 0 Then, A vector X B vector is
Answer» If A vector + B vector + C vector = 0 Then, A vector X B vector is

Discussion

173.	ABC is a right angled triangle situated in a uniform electric field E which is in the plane of the triangle. The points A and B are at the same potential of 15V while the point C is at a potential of 20V. AB=3cm and BC=4cm. The magnitude of electric field is (in S.I. units)
Answer» ABC is a right angled triangle situated in a uniform electric field E which is in the plane of the triangle. The points A and B are at the same potential of 15V while the point C is at a potential of 20V. AB=3cm and BC=4cm. The magnitude of electric field is (in S.I. units)

Discussion

174.	Why does a saw become warm when it is used to cut a log of wood?
Answer» Why does a saw become warm when it is used to cut a log of wood?

Discussion

175.	How does the space expand itself?The galaxy moves on its own?
Answer» How does the space expand itself?The galaxy moves on its own?

Discussion

176.	ABCD is a trapezium with area 92 sq. cm. AB & DC are its parallel sides & AB = 2 DC - 1. If DC = 8 cm, find the height of the trapezium.
Answer» ABCD is a trapezium with area 92 sq. cm. AB & DC are its parallel sides & AB = 2 DC - 1. If DC = 8 cm, find the height of the trapezium.

Discussion

177.	What is dispersion?
Answer» What is dispersion?

Discussion

178.	A coating of _________is deposited on iron to protect it from corrosion and formation of rust.
Answer» A coating of _________is deposited on iron to protect it from corrosion and formation of rust.

Discussion

179.	Which among the following is the best conductor of heat?
Answer» Which among the following is the best conductor of heat?

Discussion

180.	Cooking utensils are provided with handles made of plastic. Why?
Answer» Cooking utensils are provided with handles made of plastic. Why?

Discussion

181.	ntA ball collides directly with another ball at rest and is brought to rest by impact . If half of the initial kinetic energy is lost in the impact , then what is coefficient of restitution?n
Answer» ntA ball collides directly with another ball at rest and is brought to rest by impact . If half of the initial kinetic energy is lost in the impact , then what is coefficient of restitution?n

Discussion

182.	22.Which of the following options is correct if a particle is moving along x axis according to equation
Answer» 22.Which of the following options is correct if a particle is moving along x axis according to equation

Discussion

183.	The line perpendicular to the reflective surface is the ___.
Answer» The line perpendicular to the reflective surface is the ___.

Discussion

184.	Capacitor of capaci†an ce C initially charged to potential difference V volt.Now it is connected to a battery of 2V volt with opposite polarity.Heat developed in the circuit is
Answer» Capacitor of capaci†an ce C initially charged to potential difference V volt.Now it is connected to a battery of 2V volt with opposite polarity.Heat developed in the circuit is

Discussion

185.	25.What is the appropriate peak value of an alternating current producing four times the heat produced per second by a steady current of 2A in a resistor?
Answer» 25.What is the appropriate peak value of an alternating current producing four times the heat produced per second by a steady current of 2A in a resistor?

Discussion

186.	A uniform solid cylinder of mass 1 kg and radius 20 cm rotates about a fixed vertical frictionless axle with an angular speed of 50 rad/s. A particle of mass 0.5 kg now sticks on cylinder at a distance of 15 cm from the axle. The change in angular velocity (in rad/s) of the cylinder is
Answer» A uniform solid cylinder of mass 1 kg and radius 20 cm rotates about a fixed vertical frictionless axle with an angular speed of 50 rad/s. A particle of mass 0.5 kg now sticks on cylinder at a distance of 15 cm from the axle. The change in angular velocity (in rad/s) of the cylinder is

Discussion

187.	beetles sitting wires funny
Answer» beetles sitting wires funny

Discussion

188.	52.Two similar charge repel each other with a force of 88.2N when placed 2 cm apart in air. Calculate the strenght of the charges.
Answer» 52.Two similar charge repel each other with a force of 88.2N when placed 2 cm apart in air. Calculate the strenght of the charges.

Discussion

189.	Time period of a simple pendulum depends upon:
Answer» Time period of a simple pendulum depends upon:

Discussion

190.	Which of the following statement about the Motion is correct?
Answer» Which of the following statement about the Motion is correct?

Discussion

191.	How does a conductor of heat differ from an insulator? Give examples for each.
Answer» How does a conductor of heat differ from an insulator? Give examples for each.

Discussion

192.	A bus decreases its speed from 80km hr−1 to 60km hr−1 in 5 seconds. What is the acceleration of the bus?
Answer» A bus decreases its speed from $80 k m h r^{- 1}$ to $60 k m h r^{- 1}$ in 5 seconds. What is the acceleration of the bus?

Discussion

193.	What is lightning?
Answer» What is lightning?

Discussion

194.	A body A travels at 20 m s−1 and a body B travels at 30 m s−1. If the distance covered by these bodies is the same, what is the ratio of the time taken by A to the time taken by B?
Answer» A body A travels at $20 {m s}^{- 1}$ and a body B travels at $30 {m s}^{- 1}$ . If the distance covered by these bodies is the same, what is the ratio of the time taken by A to the time taken by B?

Discussion

195.	Why is it advisable to wear light coloured clothes in summer?
Answer» Why is it advisable to wear light coloured clothes in summer?

Discussion

196.	Why do we wear light coloured clothes in summer and dark coloured clothes in winter
Answer» Why do we wear light coloured clothes in summer and dark coloured clothes in winter

Discussion

197.	The base units in MKS system for length, mass and time respectively are:
Answer» The base units in MKS system for length, mass and time respectively are:

Discussion

198.	a uniform conducting wire of length 18 l and carrying current i is qound up as a current coil as regular hexa gon of side l then magnetic moment of the coil is.
Answer» a uniform conducting wire of length 18 l and carrying current i is qound up as a current coil as regular hexa gon of side l then magnetic moment of the coil is.

Discussion

199.	Just by touching, how would you identify: (i) Plane mirror (ii) Convex Mirror (iii) Concave Mirror [3 MARKS]
Answer» Just by touching, how would you identify: (i) Plane mirror (ii) Convex Mirror (iii) Concave Mirror [3 MARKS]

Discussion

200.	47.A ball of mass m is moving with velocity v collides head on with another identical ball at rest. 1/4 th of kinetic energy is lost in collision then the coefficient restitutuion is
Answer» 47.A ball of mass m is moving with velocity v collides head on with another identical ball at rest. 1/4 th of kinetic energy is lost in collision then the coefficient restitutuion is

Discussion

Explore topic-wise InterviewSolutions in .

why object in convex mirror are smaller ? Explain with the help of diagram

A ray OA is incident upon a smooth surface POQ. It is reflected back along OB. A normal ON is drawn perpendicular to the surface at O (the point of incidence). The value of ∠AOP is60∘. Find the value of the angle of reflection.

If a body is moving in a straight line but it keeps changing its speed, then the motion of the body is:

A container is filled with liquid up to 20 cm. The pressure at the bottom of the liquid column is 10 Pa. Find the density of the liquid. GIven: Acceleration due to gravity, g = 10 m/s2.

the momentum of electron with energy 20ev is

Calculate the ratio of average kinetic energy of one molecule of diatomic gas (rigid)and diatomic gas (elastic) at 150^°C

Which region is present in the shadow formed by a point source of light?

Question 14An electric heater is rated 1500 W. How much energy does it use in 10 hours?

A particle moves perpendicularly towards a plane mirror with a constant speed of 4cm/s. What is the speed of the image observed by an observer moving with 2cm/s along the same direction? Mirror is also moving with a speed of 10cm/s in the opposite direction

Define electrical conductivity. Which of the following do not conduct electricity.Carbon, Aluminium, Copper, Glass, Wood and Iron.

Question 12 The figure below shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?

A charge of 8 microcoulomb moving with a velocity of (2i + 3j)m/s enters a magnetic field of (6i + 9j)T. Find the force acting on the charge.

Which of the following describes the common domestic power supplied in India?

Why does bursting of a balloon make a lot of sound ?

We have to make a battery from the following arrangement. Select the correct statement(s):

A rubber ball is taken to depth 1 km inside water so that its volume reduces by 0.05%. What is the bulk modulus for rubber.

The phenomenon of expansion of ___ due to heat is used in making a thermometer.

Are hurricanes stronger or cyclones and typhoons stronger?

A cell of negligible resistance and emf 2 volt is connected to series combination of 2, 3 and 5 ohm .The potential difference in volt between the terminals of 3 ohm resistance will be

Fill the missing word in the blank spaces in the following statements:(a) Wind is ––––– air.(b) Near the earth’s surface ––––– air rises up whereas ––––– air comes down.(c) Air moves from a region of ––––– pressure to a region of ––––– pressure.

If A vector + B vector + C vector = 0 Then, A vector X B vector is

ABC is a right angled triangle situated in a uniform electric field E which is in the plane of the triangle. The points A and B are at the same potential of 15V while the point C is at a potential of 20V. AB=3cm and BC=4cm. The magnitude of electric field is (in S.I. units)

Why does a saw become warm when it is used to cut a log of wood?

How does the space expand itself?The galaxy moves on its own?

ABCD is a trapezium with area 92 sq. cm. AB &amp; DC are its parallel sides &amp; AB = 2 DC - 1. If DC = 8 cm, find the height of the trapezium.

What is dispersion?

A coating of _________is deposited on iron to protect it from corrosion and formation of rust.

Which among the following is the best conductor of heat?

Cooking utensils are provided with handles made of plastic. Why?

ntA ball collides directly with another ball at rest and is brought to rest by impact . If half of the initial kinetic energy is lost in the impact , then what is coefficient of restitution?n

22.Which of the following options is correct if a particle is moving along x axis according to equation

The line perpendicular to the reflective surface is the ___.

Capacitor of capaci†an ce C initially charged to potential difference V volt.Now it is connected to a battery of 2V volt with opposite polarity.Heat developed in the circuit is

25.What is the appropriate peak value of an alternating current producing four times the heat produced per second by a steady current of 2A in a resistor?

A uniform solid cylinder of mass 1 kg and radius 20 cm rotates about a fixed vertical frictionless axle with an angular speed of 50 rad/s. A particle of mass 0.5 kg now sticks on cylinder at a distance of 15 cm from the axle. The change in angular velocity (in rad/s) of the cylinder is

beetles sitting wires funny

52.Two similar charge repel each other with a force of 88.2N when placed 2 cm apart in air. Calculate the strenght of the charges.

Time period of a simple pendulum depends upon:

Which of the following statement about the Motion is correct?

How does a conductor of heat differ from an insulator? Give examples for each.

A bus decreases its speed from 80km hr−1 to 60km hr−1 in 5 seconds. What is the acceleration of the bus?

What is lightning?

A body A travels at 20 m s−1 and a body B travels at 30 m s−1. If the distance covered by these bodies is the same, what is the ratio of the time taken by A to the time taken by B?

Why is it advisable to wear light coloured clothes in summer?

Why do we wear light coloured clothes in summer and dark coloured clothes in winter

The base units in MKS system for length, mass and time respectively are:

a uniform conducting wire of length 18 l and carrying current i is qound up as a current coil as regular hexa gon of side l then magnetic moment of the coil is.

Just by touching, how would you identify: (i) Plane mirror (ii) Convex Mirror (iii) Concave Mirror [3 MARKS]

47.A ball of mass m is moving with velocity v collides head on with another identical ball at rest. 1/4 th of kinetic energy is lost in collision then the coefficient restitutuion is

ABCD is a trapezium with area 92 sq. cm. AB & DC are its parallel sides & AB = 2 DC - 1. If DC = 8 cm, find the height of the trapezium.