13232 + Interview Questions in Physics Page 157 InterviewSolution

7801.	In the given food web, if wild cat population becomes extinct, then _______ population would increase.
Answer» In the given food web, if wild cat population becomes extinct, then _______ population would increase.

7801.

In the given food web, if wild cat population becomes extinct, then _______ population would increase.

Answer»

In the given food web, if wild cat population becomes extinct, then _______ population would increase.

7802.	Are all resistive forces conservative forces?
Answer» Are all resistive forces conservative forces?

Discussion

7803.	Hypermetropia is rectified by using
Answer» Hypermetropia is rectified by using

Discussion

7804.	What is the difference between 'distance travelled' by a body and its 'displacement' ? Explain with the help of a diagram.
Answer» What is the difference between 'distance travelled' by a body and its 'displacement' ? Explain with the help of a diagram.

Discussion

7805.	The pitch of a screw gauge is 1 mm and its circular scale has 100 divisions. In measurement of the diameter of a wire, the main scale reads 2 mm and 45th mark on circular scale coincides with the base line. Find : (i) the least count, and (ii) the diameter of the wire.
Answer» The pitch of a screw gauge is 1 mm and its circular scale has 100 divisions. In measurement of the diameter of a wire, the main scale reads 2 mm and 45th mark on circular scale coincides with the base line. Find : (i) the least count, and (ii) the diameter of the wire.

7805.

The pitch of a screw gauge is 1 mm and its circular scale has 100 divisions. In measurement of the diameter of a wire, the main scale reads 2 mm and 45th mark on circular scale coincides with the base line. Find : (i) the least count, and (ii) the diameter of the wire.

Answer»

The pitch of a screw gauge is 1 mm and its circular scale has 100 divisions. In measurement of the diameter of a wire, the main scale reads 2 mm and 45th mark on circular scale coincides with the base line. Find :

(i) the least count, and

(ii) the diameter of the wire.

Discussion

7806.	A PARTICLE CROSSING THE ORIGIN OF CO ORDINATES AT TIME T=0 MOVES IN THE xy PLANE WITH A CONSTANT ACCELERATION a IN THE y -direction .IF ITS EQUATION OF MOTION ISyu= bx^2 THEN WHAT IS ITS ANGLE OF PROJECTION IN THE X DIRECTION ?
Answer» A PARTICLE CROSSING THE ORIGIN OF CO ORDINATES AT TIME T=0 MOVES IN THE xy PLANE WITH A CONSTANT ACCELERATION a IN THE y -direction .IF ITS EQUATION OF MOTION ISyu= bx^2 THEN WHAT IS ITS ANGLE OF PROJECTION IN THE X DIRECTION ?

Discussion

7807.	Floyed-Warshall algorithm utilizes_______ to solve the all-pairs shortest paths problem on a directed graph in _____time.
Answer» Floyed-Warshall algorithm utilizes_______ to solve the all-pairs shortest paths problem on a directed graph in _____time.

Discussion

7808.	If a ball is dropped from a height H above the ground, then which of the following is the correct graph for total energy(TE) vs height from the ground(h)?
Answer» If a ball is dropped from a height H above the ground, then which of the following is the correct graph for total energy(TE) vs height from the ground(h)?

Discussion

7809.	78. Find the effective resistance between A and B
Answer» 78. Find the effective resistance between A and B

Discussion

7810.	Three statements regarding the propagation of sound waves. I Sound waves propagate through a series of crests and troughs. II Sound waves require a material medium for their propagation. III The propagation of sound waves is attributed to the motion of particles. Among the given statements,
Answer» Three statements regarding the propagation of sound waves. I Sound waves propagate through a series of crests and troughs. II Sound waves require a material medium for their propagation. III The propagation of sound waves is attributed to the motion of particles. Among the given statements,

7810.

Three statements regarding the propagation of sound waves. I Sound waves propagate through a series of crests and troughs. II Sound waves require a material medium for their propagation. III The propagation of sound waves is attributed to the motion of particles. Among the given statements,

Answer»

Three statements regarding the propagation of sound waves.

I Sound waves propagate through a series of crests and troughs.

II Sound waves require a material medium for their propagation.

III The propagation of sound waves is attributed to the motion of particles.

Among the given statements,

Discussion

7811.	Name the device which converts electrical energy into mechanical energy.
Answer» Name the device which converts electrical energy into mechanical energy.

Discussion

7812.	What are the examples of sustainable development?
Answer» What are the examples of sustainable development?

Discussion

7813.	5.A ball is thrown vertically upwards with certain velocity.While moving upwards it reaches a point A at t1 second and then reaches the ground at t1+t2 second.find the height of point A above point of projection
Answer» 5.A ball is thrown vertically upwards with certain velocity.While moving upwards it reaches a point A at t1 second and then reaches the ground at t1+t2 second.find the height of point A above point of projection

Discussion

7814.	The position of a particle varies with 1/ (t+2)^3/2. the velocity of particle is proportional to1) x2) x^1/23) x^5/24) x^1/3
Answer» The position of a particle varies with 1/ (t+2)^3/2. the velocity of particle is proportional to 1) x 2) x^1/2 3) x^5/2 4) x^1/3

Discussion

7815.	Unit of ‘g’ is
Answer» Unit of ‘g’ is

Discussion

7816.	resonance
Answer» resonance

Discussion

7817.	A trolley of mass 20 kg is at rest on smooth horizontalsurface. A boy throws horizontally one by one 5 kgsand ball with 20 m/s towards trolley. These sand ballsstick with trolley. How many sand balls should stickon trolley so that trolley will move with 10 m/s?\lbrack Assume sand ball moved in horizontal direction\rbrack
Answer» A trolley of mass 20 kg is at rest on smooth horizontalsurface. A boy throws horizontally one by one 5 kgsand ball with 20 m/s towards trolley. These sand ballsstick with trolley. How many sand balls should stickon trolley so that trolley will move with 10 m/s?\lbrack Assume sand ball moved in horizontal direction\rbrack

Discussion

7818.	What are the differences between mass and weight?
Answer» What are the differences between mass and weight?

Discussion

7819.	what is law of equipartition of energy?
Answer» what is law of equipartition of energy?

Discussion

7820.	In how much time (in seconds) should a charge of 10 C flow between the two terminals so as to maintain a constant current of 100 A?
Answer» In how much time (in seconds) should a charge of $10 C$ flow between the two terminals so as to maintain a constant current of $100 A$ ?

Discussion

7821.	What does the area below v–t graph give?
Answer» What does the area below $v - t$ graph give?

Discussion

7822.	The maximum temperature that can be attained in a box-type solar cooker is ______.
Answer» The maximum temperature that can be attained in a box-type solar cooker is ______.

Discussion

7823.	What is gravitational constant?
Answer» What is gravitational constant?

Discussion

7824.	What is the unit of gravitational constant ?
Answer» What is the unit of gravitational constant ?

Discussion

7825.	Find the current in the given circuit
Answer» Find the current in the given circuit

Discussion

7826.	An athelete often run before taking long jump.why?
Answer» An athelete often run before taking long jump.why?

Discussion

7827.	Time period of oscillation of a particle along a tunnel inside the earth
Answer» Time period of oscillation of a particle along a tunnel inside the earth

Discussion

7828.	Calculate the unuseful energy (in cal) left after the completion of the following food chain, if 5,000 cal is the gross primary production (GPP). 5
Answer» Calculate the unuseful energy (in cal) left after the completion of the following food chain, if $5, 000 cal$ is the gross primary production (GPP). 5

7828.

Calculate the unuseful energy (in cal) left after the completion of the following food chain, if 5,000 cal is the gross primary production (GPP). 5

Answer» Calculate the unuseful energy (in cal) left after the completion of the following food chain, if

5, 000 cal

is the gross primary production (GPP).

5

Discussion

7829.	Question 5No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be(a) Plane(b) Concave(c) Convex(d) Either plane or convex
Answer» Question 5 No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be (a) Plane (b) Concave (c) Convex (d) Either plane or convex

Discussion

7830.	Two balls of masses 'm' and '2m' are in motion with velocity '2v' and 'v' respectively. Calculate: 1. Their inertia 2. Their momentum 3. The force needed to stop them in the same time
Answer» Two balls of masses 'm' and '2m' are in motion with velocity '2v' and 'v' respectively. Calculate: 1. Their inertia 2. Their momentum 3. The force needed to stop them in the same time

7830.

Two balls of masses 'm' and '2m' are in motion with velocity '2v' and 'v' respectively. Calculate: 1. Their inertia 2. Their momentum 3. The force needed to stop them in the same time

Answer»

Two balls of masses 'm' and '2m' are in motion with velocity '2v' and 'v' respectively. Calculate:

1. Their inertia

2. Their momentum

3. The force needed to stop them in the same time

Discussion

7831.	The pressure of water on the ground floor is 40,000 Pa and on the first floor is 10,000 Pa. Find the height of the first floor. (Take : density of water = 1000 kg m−3, g =10 m s−2
Answer» The pressure of water on the ground floor is 40,000 Pa and on the first floor is 10,000 Pa. Find the height of the first floor. (Take : density of water = 1000 kg $m^{- 3}$ , g =10 m $s^{- 2}$

Discussion

7832.	a.What is pressure?Write its S.I units?
Answer» a.What is pressure?Write its S.I units?

Discussion

7833.	a concave mirror of radius of curvature 30 cm produce a real image 3 times the size of object the distance between object and its image is
Answer» a concave mirror of radius of curvature 30 cm produce a real image 3 times the size of object the distance between object and its image is

Discussion

7834.	The resistance and leakage reactance of a 10 kVA, 50 Hz, 2300/230 V distribution transformer are:r1=3.96 Ω, r2=0.0396 Ωx1=15.8 Ω, x2=0.158 ΩThe transformer delivers rated kVA at 0.8 p.f lagging to a load on LV side to maintain 230 V across load terminals. The HV side voltage is _________V. 2411.69
Answer» The resistance and leakage reactance of a 10 kVA, 50 Hz, 2300/230 V distribution transformer are: $r_{1} = 3.96 Ω$ , $r_{2} = 0.0396 Ω$ $x_{1} = 15.8 Ω$ , $x_{2} = 0.158 Ω$ The transformer delivers rated kVA at 0.8 p.f lagging to a load on LV side to maintain 230 V across load terminals. The HV side voltage is _________V. 2411.69

Discussion

7835.	The acceleration-time graph of motion of an object is given. What will be the corresponding most probable velocity-time graph of the object?
Answer» The acceleration-time graph of motion of an object is given. What will be the corresponding most probable velocity-time graph of the object?

Discussion

7836.	Use the following information to answer the next question. A metallic ball at 40°C is dropped in a vessel containing water at 20°C Which of the following statements corresponding to the above statement is correct?
Answer» Use the following information to answer the next question. A metallic ball at 40°C is dropped in a vessel containing water at 20°C Which of the following statements corresponding to the above statement is correct?

7836.

Use the following information to answer the next question. A metallic ball at 40°C is dropped in a vessel containing water at 20°C Which of the following statements corresponding to the above statement is correct?

Answer»

Use the following information to answer the next question.

A metallic ball at 40°C is dropped in a vessel containing water at 20°C

Which of the following statements corresponding to the above statement is correct?

Discussion

7837.	What name is given to the sound waves of frequency too high for humans to hear ?
Answer» What name is given to the sound waves of frequency too high for humans to hear ?

Discussion

7838.	A steel scale measures the length of a copper rod as L cm when both are at 20∘C, the calibration temperature for the scale. If the coefficients of linear expansion for steel and copper are αs and αc respectively, what would be the scale reading (in cm) when both are at 21∘C?
Answer» A steel scale measures the length of a copper rod as L cm when both are at $20^{\circ} C$ , the calibration temperature for the scale. If the coefficients of linear expansion for steel and copper are $α_{s}$ and $α_{c}$ respectively, what would be the scale reading (in cm) when both are at $21^{\circ} C$ ?

Discussion

7839.	An object travels around a circle of radius 6 metre with a speed of 3π ms. Find the distance and displacement after 3 seconds.
Answer» An object travels around a circle of radius 6 metre with a speed of $3 π$ $\frac{m}{s}$ . Find the distance and displacement after 3 seconds.

Discussion

7840.	Rachna states that law of conservation of energy does not remain true all the time and has certain exceptions. For example, when an object falls down from a certain height, its potential energy does not remain same, but decreases progressively. Is Rachna correct? Justify your answer.
Answer» Rachna states that law of conservation of energy does not remain true all the time and has certain exceptions. For example, when an object falls down from a certain height, its potential energy does not remain same, but decreases progressively. Is Rachna correct? Justify your answer.

Discussion

7841.	What is similarities and differences between metal and non-metal
Answer» What is similarities and differences between metal and non-metal

Discussion

7842.	46.A block of mass 2 kg is placed on a rough horizontal surface ( = 0.2) and is being acted upon by a time dependent horizontal force F = 2t (t in second). The velocity of the block at t = 4 second is (1) 1m/s (2) 1.5 m/s (3) 2 m/s (4) 5 m/s
Answer» 46.A block of mass 2 kg is placed on a rough horizontal surface ( = 0.2) and is being acted upon by a time dependent horizontal force F = 2t (t in second). The velocity of the block at t = 4 second is (1) 1m/s (2) 1.5 m/s (3) 2 m/s (4) 5 m/s

Discussion

7843.	Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer. Can you name the three types of inertia? [5 MARKS]
Answer» Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer. Can you name the three types of inertia? [5 MARKS]

Discussion

7844.	At an ins†an t velocity and acceleration of a particle moving in xy plane are 2i+3j m/s and -3j+2jm/s^2 rate of change of speed of particle at this ins†an t i
Answer» At an ins†an t velocity and acceleration of a particle moving in xy plane are 2i+3j m/s and -3j+2jm/s^2 rate of change of speed of particle at this ins†an t i

Discussion

7845.	A resistance R of thermal coefficient of resistivity Alpha is connected in parallel with a resistance 3R having thermal coefficient of resistivity 2Alpha then the equivalent thermal coefficient of resistivity is
Answer» A resistance R of thermal coefficient of resistivity Alpha is connected in parallel with a resistance 3R having thermal coefficient of resistivity 2Alpha then the equivalent thermal coefficient of resistivity is

Discussion

7846.	Which among the following is true for a plane mirror?
Answer» Which among the following is true for a plane mirror?

Discussion

7847.	What are the similarities and differences between gravitational, electromagnetic and magnetic force?
Answer» What are the similarities and differences between gravitational, electromagnetic and magnetic force?

Discussion

7848.	A ball is dropped from the top of a tower with a height of 80 m. At the same time, another ball is projected horizontally from the tower. What is the time taken by both the balls to reach the ground?
Answer» A ball is dropped from the top of a tower with a height of 80 m. At the same time, another ball is projected horizontally from the tower. What is the time taken by both the balls to reach the ground?

Discussion

7849.	A balloon has 2 g of air. A small hole is pierced into it. The air comes out with a velocity of 4 m/s. If the balloon shrinks conpletely in 2.5s, theaverage force acting on the balloon is?
Answer» A balloon has 2 g of air. A small hole is pierced into it. The air comes out with a velocity of 4 m/s. If the balloon shrinks conpletely in 2.5s, theaverage force acting on the balloon is?

Discussion

7850.	how to find the average speed of a body ? what is the formula of it ??
Answer» how to find the average speed of a body ? what is the formula of it ??

Discussion

Explore topic-wise InterviewSolutions in .

In the given food web, if wild cat population becomes extinct, then _______ population would increase.

Are all resistive forces conservative forces?

Hypermetropia is rectified by using

What is the difference between 'distance travelled' by a body and its 'displacement' ? Explain with the help of a diagram.

The pitch of a screw gauge is 1 mm and its circular scale has 100 divisions. In measurement of the diameter of a wire, the main scale reads 2 mm and 45th mark on circular scale coincides with the base line. Find : (i) the least count, and (ii) the diameter of the wire.

A PARTICLE CROSSING THE ORIGIN OF CO ORDINATES AT TIME T=0 MOVES IN THE xy PLANE WITH A CONSTANT ACCELERATION a IN THE y -direction .IF ITS EQUATION OF MOTION ISyu= bx^2 THEN WHAT IS ITS ANGLE OF PROJECTION IN THE X DIRECTION ?

Floyed-Warshall algorithm utilizes_______ to solve the all-pairs shortest paths problem on a directed graph in _____time.

If a ball is dropped from a height H above the ground, then which of the following is the correct graph for total energy(TE) vs height from the ground(h)?

78. Find the effective resistance between A and B

Three statements regarding the propagation of sound waves. I Sound waves propagate through a series of crests and troughs. II Sound waves require a material medium for their propagation. III The propagation of sound waves is attributed to the motion of particles. Among the given statements,

Name the device which converts electrical energy into mechanical energy.

What are the examples of sustainable development?

5.A ball is thrown vertically upwards with certain velocity.While moving upwards it reaches a point A at t1 second and then reaches the ground at t1+t2 second.find the height of point A above point of projection

The position of a particle varies with 1/ (t+2)^3/2. the velocity of particle is proportional to1) x2) x^1/23) x^5/24) x^1/3

Unit of ‘g’ is

resonance

What are the differences between mass and weight?

what is law of equipartition of energy?

In how much time (in seconds) should a charge of 10 C flow between the two terminals so as to maintain a constant current of 100 A?

What does the area below v–t graph give?

The maximum temperature that can be attained in a box-type solar cooker is ______.

What is gravitational constant?

What is the unit of gravitational constant ?

Find the current in the given circuit

An athelete often run before taking long jump.why?

Time period of oscillation of a particle along a tunnel inside the earth

Calculate the unuseful energy (in cal) left after the completion of the following food chain, if 5,000 cal is the gross primary production (GPP). 5

Question 5No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be(a) Plane(b) Concave(c) Convex(d) Either plane or convex

Two balls of masses 'm' and '2m' are in motion with velocity '2v' and 'v' respectively. Calculate: 1. Their inertia 2. Their momentum 3. The force needed to stop them in the same time

The pressure of water on the ground floor is 40,000 Pa and on the first floor is 10,000 Pa. Find the height of the first floor. (Take : density of water = 1000 kg m−3, g =10 m s−2

a.What is pressure?Write its S.I units?

a concave mirror of radius of curvature 30 cm produce a real image 3 times the size of object the distance between object and its image is

The acceleration-time graph of motion of an object is given. What will be the corresponding most probable velocity-time graph of the object?

Use the following information to answer the next question. A metallic ball at 40°C is dropped in a vessel containing water at 20°C Which of the following statements corresponding to the above statement is correct?

What name is given to the sound waves of frequency too high for humans to hear ?

A steel scale measures the length of a copper rod as L cm when both are at 20∘C, the calibration temperature for the scale. If the coefficients of linear expansion for steel and copper are αs and αc respectively, what would be the scale reading (in cm) when both are at 21∘C?

An object travels around a circle of radius 6 metre with a speed of 3π ms. Find the distance and displacement after 3 seconds.

Rachna states that law of conservation of energy does not remain true all the time and has certain exceptions. For example, when an object falls down from a certain height, its potential energy does not remain same, but decreases progressively. Is Rachna correct? Justify your answer.

What is similarities and differences between metal and non-metal

46.A block of mass 2 kg is placed on a rough horizontal surface ( = 0.2) and is being acted upon by a time dependent horizontal force F = 2t (t in second). The velocity of the block at t = 4 second is (1) 1m/s (2) 1.5 m/s (3) 2 m/s (4) 5 m/s

At an ins†an t velocity and acceleration of a particle moving in xy plane are 2i+3j m/s and -3j+2jm/s^2 rate of change of speed of particle at this ins†an t i

A resistance R of thermal coefficient of resistivity Alpha is connected in parallel with a resistance 3R having thermal coefficient of resistivity 2Alpha then the equivalent thermal coefficient of resistivity is

Which among the following is true for a plane mirror?

What are the similarities and differences between gravitational, electromagnetic and magnetic force?

A ball is dropped from the top of a tower with a height of 80 m. At the same time, another ball is projected horizontally from the tower. What is the time taken by both the balls to reach the ground?

A balloon has 2 g of air. A small hole is pierced into it. The air comes out with a velocity of 4 m/s. If the balloon shrinks conpletely in 2.5s, theaverage force acting on the balloon is?

how to find the average speed of a body ? what is the formula of it ??

Floyed-Warshall algorithm utilizes___ to solve the all-pairs shortest paths problem on a directed graph in _time.