9478 + Interview Questions in Physics Page 12 InterviewSolution

551.	A boy sits halfway down a grassy slope. What force stops him from sliding down?
Answer» A boy sits halfway down a grassy slope. What force stops him from sliding down?

Discussion

552.	{ Certain quantity of water cools from }70^° C to }60^° C}{ in the first }5 minutes and to }54^° C in the next }}{5 minutes. The temperature of the surroundings is
Answer» { Certain quantity of water cools from }70^° C to }60^° C}{ in the first }5 minutes and to }54^° C in the next }}{5 minutes. The temperature of the surroundings is

Discussion

553.	82. The separation between the screen and a plane mirror is 2r. An isotropic point source of light is placed exactly midway between the mirror and the screen. Assume that mirror reflects 100% of incident light. Then the ratio of illuminances on the screen with and without the mirror is A) 10 : 1 B) 2 : 1 C) 10 : 9 D) 9 : 1
Answer» 82. The separation between the screen and a plane mirror is 2r. An isotropic point source of light is placed exactly midway between the mirror and the screen. Assume that mirror reflects 100% of incident light. Then the ratio of illuminances on the screen with and without the mirror is A) 10 : 1 B) 2 : 1 C) 10 : 9 D) 9 : 1

Discussion

554.	A sound has a frequency of 1,000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?
Answer» A sound has a frequency of $1, 000 Hz$ and a wavelength of $34 cm$ . How long will it take to travel $1 km$ ?

Discussion

555.	What is the characteristic of naphthalene balls?
Answer» What is the characteristic of naphthalene balls?

Discussion

556.	Which one of these expressions best brings out the effect of the footprint on the author?
Answer» Which one of these expressions best brings out the effect of the footprint on the author?

Discussion

557.	Is the structure of the atom the same as the structure of the solar system?
Answer» Is the structure of the atom the same as the structure of the solar system?

Discussion

558.	‘A cruel eyeoutworn’ (stanza 2) refers to(i) the classroom whichis shabby/noisy.(ii) the lessons whichare difficult/uninteresting.(iii) thedull/uninspiring life at school with lots of work and no play.Mark the answer thatyou consider right.
Answer» ‘A cruel eye outworn’ (stanza 2) refers to (i) the classroom which is shabby/noisy. (ii) the lessons which are difficult/uninteresting. (iii) the dull/uninspiring life at school with lots of work and no play. Mark the answer that you consider right.

558.

‘A cruel eyeoutworn’ (stanza 2) refers to(i) the classroom whichis shabby/noisy.(ii) the lessons whichare difficult/uninteresting.(iii) thedull/uninspiring life at school with lots of work and no play.Mark the answer thatyou consider right.

Answer»

‘A cruel eye
outworn’ (stanza 2) refers to

(i) the classroom which
is shabby/noisy.

(ii) the lessons which
are difficult/uninteresting.

(iii) the
dull/uninspiring life at school with lots of work and no play.

Mark the answer that
you consider right.

Discussion

559.	does acceleration in SHM change linearly with time or position or both?
Answer» does acceleration in SHM change linearly with time or position or both?

Discussion

560.	A block is sliding along a horizontal surface. It comes to rest after sometime. Which force is responsible for stopping the block?
Answer» A block is sliding along a horizontal surface. It comes to rest after sometime. Which force is responsible for stopping the block?

Discussion

561.	22 if sound wave is in air is reflected by water surface then the change in phase on reflection will be
Answer» 22 if sound wave is in air is reflected by water surface then the change in phase on reflection will be

Discussion

562.	If the intensity of sound becomes 4 times, then the amplitude becomes
Answer» If the intensity of sound becomes 4 times, then the amplitude becomes

Discussion

563.	Why anode Ray's is known as canal rays
Answer» Why anode Ray's is known as canal rays

Discussion

564.	A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is ? (1) -10 J (2) -12.50 J (3) -15.5 J (4) -17.50 J
Answer» A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is ? (1) -10 J (2) -12.50 J (3) -15.5 J (4) -17.50 J

Discussion

565.	The point inside earth's surface where an earthquake begins is known as:
Answer» The point inside earth's surface where an earthquake begins is known as:

Discussion

566.	on which princple does electric fly trapper work
Answer» on which princple does electric fly trapper work

Discussion

567.	If two waves have the same loudness and pitch then
Answer» If two waves have the same loudness and pitch then

Discussion

568.	Which of the following device can be used for protecting a building during lightning?
Answer» Which of the following device can be used for protecting a building during lightning?

Discussion

569.	Two satellites of mass m and 2m are revolving in two circular orbits of radii r and 2r around an imaginary planet , on the surface of with gravitational force is inversely proportional to dis†an ce from its centre. The ratio of orbital speed of satellites is (1) 1:1 (2) 1:2 (3) 2:1 (4) 1:\sqrt2
Answer» Two satellites of mass m and 2m are revolving in two circular orbits of radii r and 2r around an imaginary planet , on the surface of with gravitational force is inversely proportional to dis†an ce from its centre. The ratio of orbital speed of satellites is (1) 1:1 (2) 1:2 (3) 2:1 (4) 1:\sqrt2

Discussion

570.	Volume is the three dimensional space occupied by a solid, liquid or gas and it is measured by the unit .
Answer» Volume is the three dimensional space occupied by a solid, liquid or gas and it is measured by the unit .

Discussion

571.	a person moving in north direction with speed of 5 km/h and another person moving in east direction with speed 7 km/h .the relative velocity of 1st with respect to another is
Answer» a person moving in north direction with speed of 5 km/h and another person moving in east direction with speed 7 km/h .the relative velocity of 1st with respect to another is

Discussion

572.	A 5 kg block (A) ls placed on 10 kg block (B) which is at rest on the table: Coefficient of the friction between (A) and ( B)s 0.3 andbetween (B) and table is 04 A 40 N horizontal force is applied on the block (B), then the friction force between the block (A) and (B)(1)Zero(2)15 N(3)60 N4)40 N
Answer» A 5 kg block (A) ls placed on 10 kg block (B) which is at rest on the table: Coefficient of the friction between (A) and ( B)s 0.3 andbetween (B) and table is 04 A 40 N horizontal force is applied on the block (B), then the friction force between the block (A) and (B)(1)Zero(2)15 N(3)60 N4)40 N

Discussion

573.	If the ray of light incident on a plane mirror makes an angle of 25∘ with the mirror as shown in the figure.What will be the angle of reflection?
Answer» If the ray of light incident on a plane mirror makes an angle of $25^{\circ}$ with the mirror as shown in the figure. What will be the angle of reflection?

Discussion

574.	A person is in open space during a thunderstorm with no shelter (not even a tree) available nearby. Describe the safe position which he shouldtake to protect himself from lightning. Why is this position considered safe ?
Answer» A person is in open space during a thunderstorm with no shelter (not even a tree) available nearby. Describe the safe position which he shouldtake to protect himself from lightning. Why is this position considered safe ?

Discussion

575.	Using Huygens principle show that , for a parallel beam incident on a reflecting surface the angle of incidence is equal to the angle of reflection
Answer» Using Huygens principle show that , for a parallel beam incident on a reflecting surface the angle of incidence is equal to the angle of reflection

Discussion

576.	A person taking part in triathlon records his average speeds when running, cycling and swimming. His average speed when swimming was 18 km/h, average speed when running was 7 m/s and the average speed when cycling was 2 km/min. Based on the given information, which of the following statements are true?
Answer» A person taking part in triathlon records his average speeds when running, cycling and swimming. His average speed when swimming was 18 km/h, average speed when running was 7 m/s and the average speed when cycling was 2 km/min. Based on the given information, which of the following statements are true?

Discussion

577.	Four frames of same weight 8 N is pushed with a same force, which object will go farthest?
Answer» Four frames of same weight 8 N is pushed with a same force, which object will go farthest?

Discussion

578.	to cal culate time of flight with eq
Answer» to cal culate time of flight with eq

Discussion

579.	Explain the rules of concave and convex mirror
Answer» Explain the rules of concave and convex mirror

Discussion

580.	Answer the following : a. After combing hair when you bring your comb near pieces of paper it attracts them. What kind of force is responsible for this? b. What kind of force is acting between two animals in the jungle? [3 MARKS]
Answer» Answer the following : a. After combing hair when you bring your comb near pieces of paper it attracts them. What kind of force is responsible for this? b. What kind of force is acting between two animals in the jungle? [3 MARKS]

Discussion

581.	What does the underlined preposition indicate? Aditya missed important details because he was asleep throughout the lecture.
Answer» What does the underlined preposition indicate? Aditya missed important details because he was asleep throughout the lecture.

581.

What does the underlined preposition indicate? Aditya missed important details because he was asleep throughout the lecture.

Answer»

What does the underlined preposition indicate?

Aditya missed important details because he was asleep throughout the lecture.

Discussion

582.	Which one of the following is an illuminated object?
Answer» Which one of the following is an illuminated object?

Discussion

583.	Give scientific reasons.(a) The copper wire used in an electro-magnet is insulated.(b) In an electric bell, the electric current stops again and again.(c) Electrical switches are made of plastic.(d) The fuse wire is made of a good conductor.
Answer» Give scientific reasons. (a) The copper wire used in an electro-magnet is insulated. (b) In an electric bell, the electric current stops again and again. (c) Electrical switches are made of plastic. (d) The fuse wire is made of a good conductor.

583.

Give scientific reasons.(a) The copper wire used in an electro-magnet is insulated.(b) In an electric bell, the electric current stops again and again.(c) Electrical switches are made of plastic.(d) The fuse wire is made of a good conductor.

Answer»

Give scientific reasons.

(a) The copper wire used in an electro-magnet is insulated.

(b) In an electric bell, the electric current stops again and again.

(c) Electrical switches are made of plastic.

(d) The fuse wire is made of a good conductor.

Discussion

584.	Question 6Explain why sportsmen use shoes with spikes.
Answer» Question 6 Explain why sportsmen use shoes with spikes.

Discussion

585.	Which of the following does not conduct electricity?
Answer» Which of the following does not conduct electricity?

Discussion

586.	Why is pulling easier than pushing ?
Answer» Why is pulling easier than pushing ?

Discussion

587.	In a conical pendulum the length of the string is l and Φ is the angle of string with horizontal. The time period of revolution i
Answer» In a conical pendulum the length of the string is l and Φ is the angle of string with horizontal. The time period of revolution i

Discussion

588.	15. A source of sound S of frequency 500Hz is situated between a stationary observer O and a wall ,moves towards the wall with a speed of 2 m/s . If the velocity of sound's is 332 m/s ,then the number of beats per second heard by the observer is(approximately
Answer» 15. A source of sound S of frequency 500Hz is situated between a stationary observer O and a wall ,moves towards the wall with a speed of 2 m/s . If the velocity of sound's is 332 m/s ,then the number of beats per second heard by the observer is(approximately

Discussion

589.	92.A particle is executing SHM with time period T. Starting from extreme position, time taken by it to complete 1/8 oscillations is
Answer» 92.A particle is executing SHM with time period T. Starting from extreme position, time taken by it to complete 1/8 oscillations is

Discussion

590.	Explain why stars look minute from Earth.
Answer» Explain why stars look minute from Earth.

Discussion

591.	At a pressure of 24×105 dyne/cm2, the volume of O2 is 10 litre and mass is 20gm. The r.m.s. velocity will be
Answer» At a pressure of $24 \times 10^{5}$ dyne/ $c m^{2}$ , the volume of $O_{2}$ is 10 litre and mass is 20gm. The r.m.s. velocity will be

Discussion

592.	What is the effect on specific conductance and equivalent conductance on dilution ? (On dilution ions undergoes further ionization and yields more ions)
Answer» What is the effect on specific conductance and equivalent conductance on dilution ? (On dilution ions undergoes further ionization and yields more ions)

Discussion

593.	Explain the differences between the sounds of a cello and a violin in terms of frequency, pitch and time period.
Answer» Explain the differences between the sounds of a cello and a violin in terms of frequency, pitch and time period.

Discussion

594.	The tension in the simple pendulum is max at
Answer» The tension in the simple pendulum is max at

Discussion

595.	A positively charged body is brought in contact to an uncharged gold leaf electroscope, then:
Answer» A positively charged body is brought in contact to an uncharged gold leaf electroscope, then:

Discussion

596.	The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is______, if, (2λ + R is 3 times the amplitude of the wave) where λ is the wavelength.
Answer» The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is______, if, $(2 λ + R i s 3 t i m e s t h e a m p l i t u d e o f t h e w a v e)$ where $λ$ is the wavelength.

596.

The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is______, if, (2λ + R is 3 times the amplitude of the wave) where λ is the wavelength.

Answer»

The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is______, if,

$(2 λ + R i s 3 t i m e s t h e a m p l i t u d e o f t h e w a v e)$ where $λ$ is the wavelength.

Discussion

597.	An object of mass 2 kg is sliding with a constant velocity of 4 ms−1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
Answer» An object of mass 2 kg is sliding with a constant velocity of 4 $m s^{- 1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

Discussion

598.	Give reasons for the following : (a) A balloon collapses when air is removed from it. (b) Water does not run out of a drpooer unless its rubber bulb is pressed. (c) Two holes are made in a sealed oil tin to take out oil from it.
Answer» Give reasons for the following : (a) A balloon collapses when air is removed from it. (b) Water does not run out of a drpooer unless its rubber bulb is pressed. (c) Two holes are made in a sealed oil tin to take out oil from it.

598.

Give reasons for the following : (a) A balloon collapses when air is removed from it. (b) Water does not run out of a drpooer unless its rubber bulb is pressed. (c) Two holes are made in a sealed oil tin to take out oil from it.

Answer»

Give reasons for the following :

(a) A balloon collapses when air is removed from it.

(b) Water does not run out of a drpooer unless its rubber bulb is pressed.

(c) Two holes are made in a sealed oil tin to take out oil from it.

Discussion

599.	What are lightning conductors?
Answer» What are lightning conductors?

Discussion

600.	A man walks over a rough surface, the angle between the force of friction and the instantaneous velocity of the person is-what? 1.22/7 2.22/14 3.44 /7 4.0
Answer» A man walks over a rough surface, the angle between the force of friction and the instantaneous velocity of the person is-what? 1.22/7 2.22/14 3.44 /7 4.0

Discussion

Explore topic-wise InterviewSolutions in .

A boy sits halfway down a grassy slope. What force stops him from sliding down?

{ Certain quantity of water cools from }70^° C to }60^° C}{ in the first }5 minutes and to }54^° C in the next }}{5 minutes. The temperature of the surroundings is

A sound has a frequency of 1,000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

What is the characteristic of naphthalene balls?

Which one of these expressions best brings out the effect of the footprint on the author?

Is the structure of the atom the same as the structure of the solar system?

‘A cruel eyeoutworn’ (stanza 2) refers to(i) the classroom whichis shabby/noisy.(ii) the lessons whichare difficult/uninteresting.(iii) thedull/uninspiring life at school with lots of work and no play.Mark the answer thatyou consider right.

does acceleration in SHM change linearly with time or position or both?

A block is sliding along a horizontal surface. It comes to rest after sometime. Which force is responsible for stopping the block?

22 if sound wave is in air is reflected by water surface then the change in phase on reflection will be

If the intensity of sound becomes 4 times, then the amplitude becomes

Why anode Ray's is known as canal rays

A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is ? (1) -10 J (2) -12.50 J (3) -15.5 J (4) -17.50 J

The point inside earth's surface where an earthquake begins is known as:

on which princple does electric fly trapper work

If two waves have the same loudness and pitch then

Which of the following device can be used for protecting a building during lightning?

Two satellites of mass m and 2m are revolving in two circular orbits of radii r and 2r around an imaginary planet , on the surface of with gravitational force is inversely proportional to dis†an ce from its centre. The ratio of orbital speed of satellites is (1) 1:1 (2) 1:2 (3) 2:1 (4) 1:\sqrt2

Volume is the three dimensional space occupied by a solid, liquid or gas and it is measured by the unit .

a person moving in north direction with speed of 5 km/h and another person moving in east direction with speed 7 km/h .the relative velocity of 1st with respect to another is

A 5 kg block (A) ls placed on 10 kg block (B) which is at rest on the table: Coefficient of the friction between (A) and ( B)s 0.3 andbetween (B) and table is 04 A 40 N horizontal force is applied on the block (B), then the friction force between the block (A) and (B)(1)Zero(2)15 N(3)60 N4)40 N

If the ray of light incident on a plane mirror makes an angle of 25∘ with the mirror as shown in the figure.What will be the angle of reflection?

A person is in open space during a thunderstorm with no shelter (not even a tree) available nearby. Describe the safe position which he shouldtake to protect himself from lightning. Why is this position considered safe ?

Using Huygens principle show that , for a parallel beam incident on a reflecting surface the angle of incidence is equal to the angle of reflection

Four frames of same weight 8 N is pushed with a same force, which object will go farthest?

to cal culate time of flight with eq

Explain the rules of concave and convex mirror

Answer the following : a. After combing hair when you bring your comb near pieces of paper it attracts them. What kind of force is responsible for this? b. What kind of force is acting between two animals in the jungle? [3 MARKS]

What does the underlined preposition indicate? Aditya missed important details because he was asleep throughout the lecture.

Which one of the following is an illuminated object?

Give scientific reasons.(a) The copper wire used in an electro-magnet is insulated.(b) In an electric bell, the electric current stops again and again.(c) Electrical switches are made of plastic.(d) The fuse wire is made of a good conductor.

Question 6Explain why sportsmen use shoes with spikes.

Which of the following does not conduct electricity?

Why is pulling easier than pushing ?

In a conical pendulum the length of the string is l and Φ is the angle of string with horizontal. The time period of revolution i

15. A source of sound S of frequency 500Hz is situated between a stationary observer O and a wall ,moves towards the wall with a speed of 2 m/s . If the velocity of sound's is 332 m/s ,then the number of beats per second heard by the observer is(approximately

92.A particle is executing SHM with time period T. Starting from extreme position, time taken by it to complete 1/8 oscillations is

Explain why stars look minute from Earth.

At a pressure of 24×105 dyne/cm2, the volume of O2 is 10 litre and mass is 20gm. The r.m.s. velocity will be

What is the effect on specific conductance and equivalent conductance on dilution ? (On dilution ions undergoes further ionization and yields more ions)

Explain the differences between the sounds of a cello and a violin in terms of frequency, pitch and time period.

The tension in the simple pendulum is max at

A positively charged body is brought in contact to an uncharged gold leaf electroscope, then:

The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is______, if, (2λ + R is 3 times the amplitude of the wave) where λ is the wavelength.

An object of mass 2 kg is sliding with a constant velocity of 4 ms−1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

Give reasons for the following : (a) A balloon collapses when air is removed from it. (b) Water does not run out of a drpooer unless its rubber bulb is pressed. (c) Two holes are made in a sealed oil tin to take out oil from it.

What are lightning conductors?

A man walks over a rough surface, the angle between the force of friction and the instantaneous velocity of the person is-what? 1.22/7 2.22/14 3.44 /7 4.0