9478 + Interview Questions in Physics Page 105 InterviewSolution

5201.	80 Assertion:- The melting point of ice decreases with increases of pressure Reason:-Ice contracts on melting
Answer» 80 Assertion:- The melting point of ice decreases with increases of pressure Reason:-Ice contracts on melting

Discussion

5202.	What impact would decreasing irregularities on two surfaces rubbing each other have on the frictional force between them?
Answer» What impact would decreasing irregularities on two surfaces rubbing each other have on the frictional force between them?

Discussion

5203.	Show that if a ray of light is reflected successively form two mirrors inclined at an angle θ, the deviation of the ray does not depend upon the angle of incidence.
Answer» Show that if a ray of light is reflected successively form two mirrors inclined at an angle $θ$ , the deviation of the ray does not depend upon the angle of incidence.

Discussion

5204.	The layer of air that covers the entire earth's surface like a blanket is called _______.
Answer» The layer of air that covers the entire earth's surface like a blanket is called _______.

Discussion

5205.	The mass of lift is 1000 kg. The tension in the cable of the lift while the lift is moving upward with the acceleration of 2 ms-2 is:
Answer» The mass of lift is 1000 kg. The tension in the cable of the lift while the lift is moving upward with the acceleration of 2 ms^-2 is:

Discussion

5206.	Question 18Represent graphically by two separate diagrams in each case(i) Two sound waves having the same amplitude but different frequencies.(ii) Two sound waves having the same frequency but different amplitudes.(iii) Two sound waves having different amplitudes and also different wavelengths.
Answer» Question 18 Represent graphically by two separate diagrams in each case (i) Two sound waves having the same amplitude but different frequencies. (ii) Two sound waves having the same frequency but different amplitudes. (iii) Two sound waves having different amplitudes and also different wavelengths.

5206.

Question 18Represent graphically by two separate diagrams in each case(i) Two sound waves having the same amplitude but different frequencies.(ii) Two sound waves having the same frequency but different amplitudes.(iii) Two sound waves having different amplitudes and also different wavelengths.

Answer» Question 18

Represent graphically by two separate diagrams in each case

(i) Two sound waves having the same amplitude but different frequencies.

(ii) Two sound waves having the same frequency but different amplitudes.

(iii) Two sound waves having different amplitudes and also different wavelengths.

Discussion

5207.	Write relation between ins†an†an eous and relative velocity for uniform motion.
Answer» Write relation between ins†an†an eous and relative velocity for uniform motion.

Discussion

5208.	Why earth is sphere and why it rotates ?
Answer» Why earth is sphere and why it rotates ?

Discussion

5209.	If a= 9-95 then find the value of a - 1/a.
Answer» If a= 9-95 then find the value of a - 1/a.

Discussion

5210.	A drum vibrates with a lower frequency as compared to a whistle. Then, we can say that:
Answer» A drum vibrates with a lower frequency as compared to a whistle. Then, we can say that:

Discussion

5211.	50.Figure shows an object o placed in front of an equi-convex lens(refractive index = 3/2) behind which is a medium of refractive index = 4/3 and a plane mirror at a distance 47 cm from the lens. Find the distance x of the object placed in air if the final image formed coincides with the object itself. Given that radius of curvature of lens surface is 30 cm. (A) 94 cm (B) 45 cm (C) 54 cm (D) 49 cm
Answer» 50.Figure shows an object o placed in front of an equi-convex lens(refractive index = 3/2) behind which is a medium of refractive index = 4/3 and a plane mirror at a distance 47 cm from the lens. Find the distance x of the object placed in air if the final image formed coincides with the object itself. Given that radius of curvature of lens surface is 30 cm. (A) 94 cm (B) 45 cm (C) 54 cm (D) 49 cm

Discussion

5212.	At the room temperature the velocity of sound in O2 gas is v. Then in mixture of H2 and O2 gas the speed of sound at same temperature :-will be less than vwill be more than vwill be equal to vnothing can be saidhow can mass of o2+h2 be less than mass of o2 alone?
Answer» At the room temperature the velocity of sound in O2 gas is v. Then in mixture of H2 and O2 gas the speed of sound at same temperature :- will be less than v will be more than v will be equal to v nothing can be said how can mass of o2+h2 be less than mass of o2 alone?

Discussion

5213.	What do you understand by thermal expansion of a substance?
Answer» What do you understand by thermal expansion of a substance?

Discussion

5214.	Two formula cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their velocities?
Answer» Two formula cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their velocities?

Discussion

5215.	-2-3 -2+3 when simplified is(a) positive and irrational(b) positive and rational(c) negative and irrational(d) negative and rational
Answer» $(- 2 - \sqrt{3}) (- 2 + \sqrt{3})$ when simplified is (a) positive and irrational (b) positive and rational (c) negative and irrational (d) negative and rational

Discussion

5216.	Among the three scubadivers, who would experience a higher liquid pressure than the others?
Answer» Among the three scubadivers, who would experience a higher liquid pressure than the others?

Discussion

5217.	Which two air pollutants can cause acid rain?
Answer» Which two air pollutants can cause acid rain?

Discussion

5218.	A disc rolls without slipping and climbs on a rough incline and comes back .During the motion on the incline, friction is : 1) upward during upward journey 2) downward during upward journey 3) Zero 4) Insufficient information
Answer» A disc rolls without slipping and climbs on a rough incline and comes back .During the motion on the incline, friction is : 1) upward during upward journey 2) downward during upward journey 3) Zero 4) Insufficient information

Discussion

5219.	We use ball bearings between the hub and axle of ceiling fan. Why?
Answer» We use ball bearings between the hub and axle of ceiling fan. Why?

Discussion

5220.	Find in the poem lines that match the following. (i) The grasshopper’s happiness never comes to an end. (ii) The cricket’s song has a warmth that never decreases.
Answer» Find in the poem lines that match the following. (i) The grasshopper’s happiness never comes to an end. (ii) The cricket’s song has a warmth that never decreases.

5220.

Find in the poem lines that match the following. (i) The grasshopper’s happiness never comes to an end. (ii) The cricket’s song has a warmth that never decreases.

Answer»

Find in the poem lines that match the following.

(i) The grasshopper’s happiness never comes to an end.

(ii) The cricket’s song has a warmth that never decreases.

Discussion

5221.	The image formed by a plane mirror is as far behind the mirror as the object is in ………… of it.
Answer» The image formed by a plane mirror is as far behind the mirror as the object is in ………… of it.

Discussion

5222.	Why a Metal spoon can't be charged while held in hand ?
Answer» Why a Metal spoon can't be charged while held in hand ?

Discussion

5223.	which is more effective and why? order of effect of these.mesomeric , resonance , iductive , hyperconjugation , electromeric effect.
Answer» which is more effective and why? order of effect of these. mesomeric , resonance , iductive , hyperconjugation , electromeric effect.

Discussion

5224.	A particle is moving eastwards with a velocity of 5m/s . In 10sec the velocity changes to 5m/s northwards. Find average acceleration, average velocity , and average speed 1. towards N-W 2. towards N-E
Answer» A particle is moving eastwards with a velocity of 5m/s . In 10sec the velocity changes to 5m/s northwards. Find average acceleration, average velocity , and average speed 1. towards N-W 2. towards N-E

Discussion

5225.	How is the apparent weight of the floating body 0?
Answer» How is the apparent weight of the floating body 0?

Discussion

5226.	What material would you choose to make a spade for digging in the garden?
Answer» What material would you choose to make a spade for digging in the garden?

Discussion

5227.	Why is one end of a lightning conductor buried deep under the ground?
Answer» Why is one end of a lightning conductor buried deep under the ground?

Discussion

5228.	What is sound wave
Answer» What is sound wave

Discussion

5229.	When a body moving with a speed of 20 m/s. stops in 20 seconds, what is the acceleration?
Answer» When a body moving with a speed of 20 m/s. stops in 20 seconds, what is the acceleration?

Discussion

5230.	Can a pendulum clock be used in earth satellite?
Answer» Can a pendulum clock be used in earth satellite?

Discussion

5231.	5. A solid sphere has a radius of 3 CM and a mass of 0.06kg .what is the relative density of the sphere.
Answer» 5. A solid sphere has a radius of 3 CM and a mass of 0.06kg .what is the relative density of the sphere.

Discussion

5232.	What is an integer
Answer» What is an integer

Discussion

5233.	If Ram is facing north and he sees a rainbow in front of him then in which direction most probably the sun is?
Answer» If Ram is facing north and he sees a rainbow in front of him then in which direction most probably the sun is?

Discussion

5234.	We get some items made from iron wire in which iron wire is coated with plastic. Is plastic coated by the process of electroplating? Why can't plastic be coated on a metal by the process of electroplating?
Answer» We get some items made from iron wire in which iron wire is coated with plastic. Is plastic coated by the process of electroplating? Why can't plastic be coated on a metal by the process of electroplating?

Discussion

5235.	Which part of our body vibrates to produce sound when we speak?
Answer» Which part of our body vibrates to produce sound when we speak?

Discussion

5236.	If the average speed of an object is 12m/s. If it travels first half of the total time with x m/s and the other second half with velocity2x m/s so calculate the value of x
Answer» If the average speed of an object is 12m/s. If it travels first half of the total time with x m/s and the other second half with velocity2x m/s so calculate the value of x

Discussion

5237.	There are two metal spheres of same volume and same material at same temperature, but one is hollow and other is solid. Which sphere will expand more if (a).they are heated to same temperature (b) same heat is given to both ?
Answer» There are two metal spheres of same volume and same material at same temperature, but one is hollow and other is solid. Which sphere will expand more if (a).they are heated to same temperature (b) same heat is given to both ?

Discussion

5238.	(a) Define pressure. What is the relation between pressure, force and area? State units in which pressure is measured. (b) Explain why school bags are provided with wide straps to carry them.
Answer» (a) Define pressure. What is the relation between pressure, force and area? State units in which pressure is measured. (b) Explain why school bags are provided with wide straps to carry them.

5238.

(a) Define pressure. What is the relation between pressure, force and area? State units in which pressure is measured. (b) Explain why school bags are provided with wide straps to carry them.

Answer»

(a) Define pressure. What is the relation between pressure, force and area? State units in which pressure is measured.

(b) Explain why school bags are provided with wide straps to carry them.

Discussion

5239.	An object is said to be in equilibrium if ___.
Answer» An object is said to be in equilibrium if ___.

Discussion

5240.	Draw two circles of radii 3.4 cm and 1.8 cm with their centres 5.2 cm apart. How do these circles touch each other? and why?
Answer» Draw two circles of radii 3.4 cm and 1.8 cm with their centres 5.2 cm apart. How do these circles touch each other? and why?

Discussion

5241.	A body with mass 100kg and volume 0.2m3 is taken to a depth of 10 meters in water and released. Density of body is less than water. Accelaration of body after it is released is ___. Accelaration due to gravity 10m/s2 Density of water 1000kg/m3 )
Answer» A body with mass $100 k g$ and volume $0.2 m^{3}$ is taken to a depth of 10 meters in water and released. Density of body is less than water. Accelaration of body after it is released is ___. Accelaration due to gravity $10 m / s^{2}$ Density of water $1000 k g / m^{3}$ )

5241.

A body with mass 100kg and volume 0.2m3 is taken to a depth of 10 meters in water and released. Density of body is less than water. Accelaration of body after it is released is ___. Accelaration due to gravity 10m/s2 Density of water 1000kg/m3 )

Answer»

A body with mass $100 k g$ and volume $0.2 m^{3}$ is taken to a depth of 10 meters in water and released. Density of body is less than water. Accelaration of body after it is released is ___.

Accelaration due to gravity $10 m / s^{2}$

Density of water $1000 k g / m^{3}$ )

Discussion

5242.	If ROOT 7ROOT 7ROOT 7 7ROOT 7 ROOT= 7 ^X , then the value of x is.
Answer» If ROOT 7ROOT 7ROOT 7 7ROOT 7 ROOT= 7 ^X , then the value of x is.

Discussion

5243.	If the value of electric field just outside the surface of a uniformly charged disc of radius 4 m, is 10 N/C. Then the electric field due to the disc at point lying on the axis of the disc, at a distance of 3 m from the center will be :
Answer» If the value of electric field just outside the surface of a uniformly charged disc of radius $4 m$ , is $10 N/C$ . Then the electric field due to the disc at point lying on the axis of the disc, at a distance of $3 m$ from the center will be :

Discussion

5244.	Can we make our whole body negatively charged ?
Answer» Can we make our whole body negatively charged ?

Discussion

5245.	Icebergs floating on seawater are dangerous for ships. Explain the reason.
Answer» Icebergs floating on seawater are dangerous for ships. Explain the reason.

Discussion

5246.	A sharp knife cuts better than a blunt knife. Which of the following options gives the correct reason for this?
Answer» A sharp knife cuts better than a blunt knife. Which of the following options gives the correct reason for this?

Discussion

5247.	What will be the nature of a person’s image in a plane mirror as compared to the person?
Answer» What will be the nature of a person’s image in a plane mirror as compared to the person?

Discussion

5248.	Consider an actual regenerative Rankine cycle with one open feed water heater. For each kg steam entering the turbine, if mkg steam wit ha specific enthalpy of h1 is balde from the turbine, and the specific enthalpy of liquid water entering the heater is h2, then h3 the specific enthalpy of saturated liquid leaving the heater is equal to
Answer» Consider an actual regenerative Rankine cycle with one open feed water heater. For each $k g$ steam entering the turbine, if $m k g$ steam wit ha specific enthalpy of $h_{1}$ is balde from the turbine, and the specific enthalpy of liquid water entering the heater is $h_{2}$ , then $h_{3}$ the specific enthalpy of saturated liquid leaving the heater is equal to

Discussion

5249.	A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in the air as 344 ms−1.
Answer» A person has a hearing range from $20 H z$ to $20 k H z$ . What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in the air as $344 m s^{- 1}$ .

Discussion

5250.	One should read the thermometer by keeping the level of mercury along the line of sight, in order to avoid
Answer» One should read the thermometer by keeping the level of mercury along the line of sight, in order to avoid

Discussion

Explore topic-wise InterviewSolutions in .

80 Assertion:- The melting point of ice decreases with increases of pressure Reason:-Ice contracts on melting

What impact would decreasing irregularities on two surfaces rubbing each other have on the frictional force between them?

Show that if a ray of light is reflected successively form two mirrors inclined at an angle θ, the deviation of the ray does not depend upon the angle of incidence.

The layer of air that covers the entire earth's surface like a blanket is called _______.

The mass of lift is 1000 kg. The tension in the cable of the lift while the lift is moving upward with the acceleration of 2 ms-2 is:

Question 18Represent graphically by two separate diagrams in each case(i) Two sound waves having the same amplitude but different frequencies.(ii) Two sound waves having the same frequency but different amplitudes.(iii) Two sound waves having different amplitudes and also different wavelengths.

Write relation between ins†an†an eous and relative velocity for uniform motion.

Why earth is sphere and why it rotates ?

If a= 9-95 then find the value of a - 1/a.

A drum vibrates with a lower frequency as compared to a whistle. Then, we can say that:

At the room temperature the velocity of sound in O2 gas is v. Then in mixture of H2 and O2 gas the speed of sound at same temperature :-will be less than vwill be more than vwill be equal to vnothing can be saidhow can mass of o2+h2 be less than mass of o2 alone?

What do you understand by thermal expansion of a substance?

Two formula cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their velocities?

-2-3 -2+3 when simplified is(a) positive and irrational(b) positive and rational(c) negative and irrational(d) negative and rational

Among the three scubadivers, who would experience a higher liquid pressure than the others?

Which two air pollutants can cause acid rain?

A disc rolls without slipping and climbs on a rough incline and comes back .During the motion on the incline, friction is : 1) upward during upward journey 2) downward during upward journey 3) Zero 4) Insufficient information

We use ball bearings between the hub and axle of ceiling fan. Why?

Find in the poem lines that match the following. (i) The grasshopper’s happiness never comes to an end. (ii) The cricket’s song has a warmth that never decreases.

The image formed by a plane mirror is as far behind the mirror as the object is in ………… of it.

Why a Metal spoon can't be charged while held in hand ?

which is more effective and why? order of effect of these.mesomeric , resonance , iductive , hyperconjugation , electromeric effect.

A particle is moving eastwards with a velocity of 5m/s . In 10sec the velocity changes to 5m/s northwards. Find average acceleration, average velocity , and average speed 1. towards N-W 2. towards N-E

How is the apparent weight of the floating body 0?

What material would you choose to make a spade for digging in the garden?

Why is one end of a lightning conductor buried deep under the ground?

What is sound wave

When a body moving with a speed of 20 m/s. stops in 20 seconds, what is the acceleration?

Can a pendulum clock be used in earth satellite?

5. A solid sphere has a radius of 3 CM and a mass of 0.06kg .what is the relative density of the sphere.

What is an integer

If Ram is facing north and he sees a rainbow in front of him then in which direction most probably the sun is?

We get some items made from iron wire in which iron wire is coated with plastic. Is plastic coated by the process of electroplating? Why can't plastic be coated on a metal by the process of electroplating?

Which part of our body vibrates to produce sound when we speak?

If the average speed of an object is 12m/s. If it travels first half of the total time with x m/s and the other second half with velocity2x m/s so calculate the value of x

There are two metal spheres of same volume and same material at same temperature, but one is hollow and other is solid. Which sphere will expand more if (a).they are heated to same temperature (b) same heat is given to both ?

(a) Define pressure. What is the relation between pressure, force and area? State units in which pressure is measured. (b) Explain why school bags are provided with wide straps to carry them.

An object is said to be in equilibrium if ___.

Draw two circles of radii 3.4 cm and 1.8 cm with their centres 5.2 cm apart. How do these circles touch each other? and why?

A body with mass 100kg and volume 0.2m3 is taken to a depth of 10 meters in water and released. Density of body is less than water. Accelaration of body after it is released is ___. Accelaration due to gravity 10m/s2 Density of water 1000kg/m3 )

If ROOT 7ROOT 7ROOT 7 7ROOT 7 ROOT= 7 ^X , then the value of x is.

If the value of electric field just outside the surface of a uniformly charged disc of radius 4 m, is 10 N/C. Then the electric field due to the disc at point lying on the axis of the disc, at a distance of 3 m from the center will be :

Can we make our whole body negatively charged ?

Icebergs floating on seawater are dangerous for ships. Explain the reason.

A sharp knife cuts better than a blunt knife. Which of the following options gives the correct reason for this?

What will be the nature of a person’s image in a plane mirror as compared to the person?

A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in the air as 344 ms−1.

One should read the thermometer by keeping the level of mercury along the line of sight, in order to avoid