13232 + Interview Questions in Physics Page 118 InterviewSolution

5851.	A boy is sitting on a merry-go-round which is moving with a constant speed. This means that the boy is
Answer» A boy is sitting on a merry-go-round which is moving with a constant speed. This means that the boy is

Discussion

5852.	49.The nearest star (alpha centuri) to our solar system is 4.29 light years away. How much parallax would this star shows, when viewed from the two position of the earth six months apart in its orbit around the sun? (Radius of earth's orbit around the sun = 1.5 × 1011 m) : (a) 7.4 × 10-5 rad (b) 7.4 × 10-6 rad (c) 9.4 × 10-6 rad (d) none of these
Answer» 49.The nearest star (alpha centuri) to our solar system is 4.29 light years away. How much parallax would this star shows, when viewed from the two position of the earth six months apart in its orbit around the sun? (Radius of earth's orbit around the sun = 1.5 × 1011 m) : (a) 7.4 × 10-5 rad (b) 7.4 × 10-6 rad (c) 9.4 × 10-6 rad (d) none of these

Discussion

5853.	The options show a v-shaped object placed in different orientations on a surface. In which orientation does the object exert maximum pressure?
Answer» The options show a v-shaped object placed in different orientations on a surface. In which orientation does the object exert maximum pressure?

Discussion

5854.	If a wire is stretched, so that its length 20% more than its initial length, the percentage increase in the resistance of the wire is-
Answer» If a wire is stretched, so that its length $20 %$ more than its initial length, the percentage increase in the resistance of the wire is-

Discussion

5855.	Two planets move around the sun. The periodic times and the mean radii of the orbits are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to
Answer» Two planets move around the sun. The periodic times and the mean radii of the orbits are $T_{1}, T_{2} a n d r_{1}, r_{2}$ respectively. The ratio $\frac{T_{1}}{T_{2}}$ is equal to

Discussion

5856.	If a man's face is 25 cm in front of a shaving mirror, it produces an erect image 1.5 times the size of the face, the focal length of the mirror is -
Answer» If a man's face is $25 cm$ in front of a shaving mirror, it produces an erect image $1.5$ times the size of the face, the focal length of the mirror is -

Discussion

5857.	My doubt is, I have understood the 3 different equations of motion but I can’t understand how to use these equations of motion on which type of question should we use them?
Answer» My doubt is, I have understood the 3 different equations of motion but I can’t understand how to use these equations of motion on which type of question should we use them?

5857.

My doubt is, I have understood the 3 different equations of motion but I can’t understand how to use these equations of motion on which type of question should we use them?

Answer»

My doubt is,

I have understood the 3 different equations of motion but I can’t understand how to use these equations of motion on which type of question should we use them?

Discussion

5858.	Explain the meaning of the following equation: p = m × v where symbols have their usual meanings.
Answer» Explain the meaning of the following equation: p = m × v where symbols have their usual meanings.

Discussion

5859.	Which of the following is an eye infection?
Answer» Which of the following is an eye infection?

Discussion

5860.	WHAT IS THE RELATION OF POWER OF LENS WITH REFRACTIVE INDEX OF MEDIUM
Answer» WHAT IS THE RELATION OF POWER OF LENS WITH REFRACTIVE INDEX OF MEDIUM

Discussion

5861.	A sphere has a radius of 1 m and a mass of 10 kg. The density of the sphere would be.
Answer» A sphere has a radius of 1 m and a mass of 10 kg. The density of the sphere would be.

Discussion

5862.	How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm (assume that the dumbbell stops after hitting the ground? (g=10 m s−2)
Answer» How much momentum will a dumbbell of mass $10 kg$ transfer to the floor if it falls from a height of $80 cm$ (assume that the dumbbell stops after hitting the ground? $(g = 10 {m s}^{- 2}$ )

Discussion

5863.	In order to increase the resistance of a given wire of uniform cross-section to four times its value, a fraction of its length is stretched uniformly till the full length of the wire becomes 32 times the original length. What is the value of this fraction?
Answer» In order to increase the resistance of a given wire of uniform cross-section to four times its value, a fraction of its length is stretched uniformly till the full length of the wire becomes $\frac{3}{2}$ times the original length. What is the value of this fraction?

Discussion

5864.	An object of height 4 cm is placed at a distance of 24 cm in front of the convex lens of focal length 8 cm. The position and size of the image are respectively:
Answer» An object of height $4 c m$ is placed at a distance of $24 c m$ in front of the convex lens of focal length $8 c m .$ The position and size of the image are respectively:

Discussion

5865.	In which direction wire A will experience force due to a parallel wire B? (Each wire carries current I in the same direction.)
Answer» In which direction wire A will experience force due to a parallel wire B? (Each wire carries current I in the same direction.)

Discussion

5866.	What is the weight of a block of mass 5 kg at the centre of the Earth? (g=9.8 m s−2)
Answer» What is the weight of a block of mass $5 k g$ at the centre of the Earth? $(g = 9.8 m s^{- 2}$ )

Discussion

5867.	The various steps in the food chain are called____.
Answer» The various steps in the food chain are called____.

Discussion

5868.	Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure.Jaikishan and Arun move in the given direction because of:
Answer» Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure. Jaikishan and Arun move in the given direction because of:

5868.

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure.Jaikishan and Arun move in the given direction because of:

Answer»

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure.

Jaikishan and Arun move in the given direction because of:

Discussion

5869.	F=k×m×(v−u)t; where k is a constant can be rewritten as:
Answer» $F = k \times m \times \frac{(v - u)}{t}$ ; where k is a constant can be rewritten as:

Discussion

5870.	A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of earth?
Answer» A body weighs $72 N$ on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of earth?

Discussion

5871.	A glass tube of radius r is dipped vertically into a container of mercury with its lower end at a depth h below the mercury surface.If s is the surface tension of mercury ,what should be the guage pressure of air in the tube to blow a hemispherical bubble at the lower end?
Answer» A glass tube of radius r is dipped vertically into a container of mercury with its lower end at a depth h below the mercury surface.If s is the surface tension of mercury ,what should be the guage pressure of air in the tube to blow a hemispherical bubble at the lower end?

Discussion

5872.	Question 8Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
Answer» Question 8 Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

Discussion

5873.	Which of the following is/are correct?
Answer» Which of the following is/are correct?

Discussion

5874.	The increase in length of a rod on heating depends on.
Answer» The increase in length of a rod on heating depends on.

Discussion

5875.	The Kinetic energy of an object is K. If its velocity is doubled, then its kinetic energy will be
Answer» The Kinetic energy of an object is K. If its velocity is doubled, then its kinetic energy will be

Discussion

5876.	If y represents pressure and x represents velocityd2ygradient, then the dimensions ofaredx2(1) \lbrack ML-T-21(2) \lbrack M2L-2T-213) \lbrack ML-1T(4) \lbrack M2L-2T-4
Answer» If y represents pressure and x represents velocityd2ygradient, then the dimensions ofaredx2(1) \lbrack ML-T-21(2) \lbrack M2L-2T-213) \lbrack ML-1T(4) \lbrack M2L-2T-4

Discussion

5877.	The heights of mercury in a manometer are 2 cm and 8 cm. Find the pressure of the gas in the cylinder? Patm=105 N m−2The density of mercury, ρm = 13600 kg m−3.Acceleration due to gravity, g=10 m s−2
Answer» The heights of mercury in a manometer are $2 c m$ and $8 c m$ . Find the pressure of the gas in the cylinder? $P_{a t m} = 10^{5} N m^{- 2}$ The density of mercury, $ρ_{m}$ = $13600 k g m^{- 3}$ . Acceleration due to gravity, $g = 10 m s^{- 2}$

5877.

The heights of mercury in a manometer are 2 cm and 8 cm. Find the pressure of the gas in the cylinder? Patm=105 N m−2The density of mercury, ρm = 13600 kg m−3.Acceleration due to gravity, g=10 m s−2

Answer»

The heights of mercury in a manometer are $2 c m$ and $8 c m$ . Find the pressure of the gas in the cylinder? $P_{a t m} = 10^{5} N m^{- 2}$

The density of mercury, $ρ_{m}$ = $13600 k g m^{- 3}$ .

Acceleration due to gravity, $g = 10 m s^{- 2}$

Discussion

5878.	A pendulum of some length and a bob made of iron, has a time period Tiron. If another pendulum is made with the same length but with a copper bob, the new time period Tcopper would be equal to:
Answer» A pendulum of some length and a bob made of iron, has a time period $T_{i r o n}$ . If another pendulum is made with the same length but with a copper bob, the new time period $T_{c o p p e r}$ would be equal to:

Discussion

5879.	Name the physical quantity associated with N kg-1 .
Answer» Name the physical quantity associated with N kg^-1 .

Discussion

5880.	What is the unit and dimension of solar cons†an t?
Answer» What is the unit and dimension of solar cons†an t?

Discussion

5881.	5.By what percentage Will the gravitational force between two bodies be increased if their masses are increased by 50%?
Answer» 5.By what percentage Will the gravitational force between two bodies be increased if their masses are increased by 50%?

Discussion

5882.	If gravitational force is acting b/w all objects on the Earth...Then why and apple thrown in air cant attract the Earth towards itself
Answer» If gravitational force is acting b/w all objects on the Earth...Then why and apple thrown in air cant attract the Earth towards itself

Discussion

5883.	59.In the arrangement as shown ,tension T2 is
Answer» 59.In the arrangement as shown ,tension T2 is

Discussion

5884.	Starting from rest a body slides down a 45^° inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is.
Answer» Starting from rest a body slides down a 45^° inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is.

Discussion

5885.	67.Convex mirror m is half.when object placed at 60cm.where should object placed show that size of image becomes 1/4th of size of object
Answer» 67.Convex mirror m is half.when object placed at 60cm.where should object placed show that size of image becomes 1/4th of size of object

Discussion

5886.	when you are pushing a wall are your hands in motion?
Answer» when you are pushing a wall are your hands in motion?

Discussion

5887.	A body floats or sinks due to its
Answer» A body floats or sinks due to its

Discussion

5888.	The equation for a magnetic field line (in polar coordinates) in 2 dimensions is given by ___?
Answer» The equation for a magnetic field line (in polar coordinates) in 2 dimensions is given by ___?

Discussion

5889.	12.The force exerted by the floor of an elevator on the foot of the person standing there is more than the weight of the person if the elevator is 1) going up and slowing down 2) going up and speeding up 3) going down and slowing down 4) going down and speeding up
Answer» 12.The force exerted by the floor of an elevator on the foot of the person standing there is more than the weight of the person if the elevator is 1) going up and slowing down 2) going up and speeding up 3) going down and slowing down 4) going down and speeding up

Discussion

5890.	An object of mass 1 kg was moving at a speed of 10ms. A constant force acts for 4s on the object and the speed of object was 2ms in opposite direction after the applied force was removed. The force acting on the object was:
Answer» An object of mass 1 kg was moving at a speed of $10 \frac{m}{s}$ . A constant force acts for 4s on the object and the speed of object was $2 \frac{m}{s}$ in opposite direction after the applied force was removed. The force acting on the object was:

Discussion

5891.	Specific heat of water is 4.2 J/g^°C. If light of frequency 3 109Hz is used to heat 400 gm of water from 20^°C to 40^°C, the number of photons needed will be
Answer» Specific heat of water is 4.2 J/g^°C. If light of frequency 3 109Hz is used to heat 400 gm of water from 20^°C to 40^°C, the number of photons needed will be

Discussion

5892.	AB refers to an object and CD is its image formed. If AP and CP are the object and image distances from the mirror, choose the correct sign convention: 1. height of image=+ ve2. height of image=−ve3. height of object=+ve 4. height of object=−ve5. AP=+ve6. AP=−ve7. PC=+ve7. PC=+ve
Answer» AB refers to an object and CD is its image formed. If AP and CP are the object and image distances from the mirror, choose the correct sign convention: $\begin{matrix} 1. height of image = + ve & 2. height of image = - ve 3. height of object = + ve & 4. height of object = - ve 5. AP = + ve & 6. AP = - ve 7. PC = + ve & 7. PC = + ve \end{matrix}$

Discussion

5893.	a stone of mass 5kg falls from the top of a cliff 40m high and buries itself 2m deep in sand . find the average resistance offered by the sand and the time it takes to penetrate.
Answer» a stone of mass 5kg falls from the top of a cliff 40m high and buries itself 2m deep in sand . find the average resistance offered by the sand and the time it takes to penetrate.

Discussion

5894.	What would be the time period of a simple pendulum at the centre of the Earth?
Answer» What would be the time period of a simple pendulum at the centre of the Earth?

Discussion

5895.	22. Beckmann rearrangement provide information about which isomerization -optical -functional -position -geometry
Answer» 22. Beckmann rearrangement provide information about which isomerization -optical -functional -position -geometry

Discussion

5896.	Write the differences between mass and weight of an object.
Answer» Write the differences between mass and weight of an object.

Discussion

5897.	Express gravitational force quantitatively, where m and M are masses and r is the distance between them.
Answer» Express gravitational force quantitatively, where $m$ and $M$ are masses and $r$ is the distance between them.

Discussion

5898.	explain spring force ?
Answer» explain spring force ?

Discussion

5899.	What is week force
Answer» What is week force

Discussion

5900.	Explain free fall of a body and derive the equations caused due to free fall
Answer» Explain free fall of a body and derive the equations caused due to free fall

Discussion

Explore topic-wise InterviewSolutions in .

A boy is sitting on a merry-go-round which is moving with a constant speed. This means that the boy is

The options show a v-shaped object placed in different orientations on a surface. In which orientation does the object exert maximum pressure?

If a wire is stretched, so that its length 20% more than its initial length, the percentage increase in the resistance of the wire is-

Two planets move around the sun. The periodic times and the mean radii of the orbits are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to

If a man's face is 25 cm in front of a shaving mirror, it produces an erect image 1.5 times the size of the face, the focal length of the mirror is -

My doubt is, I have understood the 3 different equations of motion but I can’t understand how to use these equations of motion on which type of question should we use them?

Explain the meaning of the following equation: p = m × v where symbols have their usual meanings.

Which of the following is an eye infection?

WHAT IS THE RELATION OF POWER OF LENS WITH REFRACTIVE INDEX OF MEDIUM

A sphere has a radius of 1 m and a mass of 10 kg. The density of the sphere would be.

How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm (assume that the dumbbell stops after hitting the ground? (g=10 m s−2)

In order to increase the resistance of a given wire of uniform cross-section to four times its value, a fraction of its length is stretched uniformly till the full length of the wire becomes 32 times the original length. What is the value of this fraction?

An object of height 4 cm is placed at a distance of 24 cm in front of the convex lens of focal length 8 cm. The position and size of the image are respectively:

In which direction wire A will experience force due to a parallel wire B? (Each wire carries current I in the same direction.)

What is the weight of a block of mass 5 kg at the centre of the Earth? (g=9.8 m s−2)

The various steps in the food chain are called____.

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure.Jaikishan and Arun move in the given direction because of:

F=k×m×(v−u)t; where k is a constant can be rewritten as:

A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of earth?

A glass tube of radius r is dipped vertically into a container of mercury with its lower end at a depth h below the mercury surface.If s is the surface tension of mercury ,what should be the guage pressure of air in the tube to blow a hemispherical bubble at the lower end?

Question 8Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

Which of the following is/are correct?

The increase in length of a rod on heating depends on.

The Kinetic energy of an object is K. If its velocity is doubled, then its kinetic energy will be

If y represents pressure and x represents velocityd2ygradient, then the dimensions ofaredx2(1) \lbrack ML-T-21(2) \lbrack M2L-2T-213) \lbrack ML-1T(4) \lbrack M2L-2T-4

The heights of mercury in a manometer are 2 cm and 8 cm. Find the pressure of the gas in the cylinder? Patm=105 N m−2The density of mercury, ρm = 13600 kg m−3.Acceleration due to gravity, g=10 m s−2

A pendulum of some length and a bob made of iron, has a time period Tiron. If another pendulum is made with the same length but with a copper bob, the new time period Tcopper would be equal to:

Name the physical quantity associated with N kg-1 .

What is the unit and dimension of solar cons†an t?

5.By what percentage Will the gravitational force between two bodies be increased if their masses are increased by 50%?

If gravitational force is acting b/w all objects on the Earth...Then why and apple thrown in air cant attract the Earth towards itself

59.In the arrangement as shown ,tension T2 is

Starting from rest a body slides down a 45^° inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is.

67.Convex mirror m is half.when object placed at 60cm.where should object placed show that size of image becomes 1/4th of size of object

when you are pushing a wall are your hands in motion?

A body floats or sinks due to its

The equation for a magnetic field line (in polar coordinates) in 2 dimensions is given by ___?

12.The force exerted by the floor of an elevator on the foot of the person standing there is more than the weight of the person if the elevator is 1) going up and slowing down 2) going up and speeding up 3) going down and slowing down 4) going down and speeding up

An object of mass 1 kg was moving at a speed of 10ms. A constant force acts for 4s on the object and the speed of object was 2ms in opposite direction after the applied force was removed. The force acting on the object was:

Specific heat of water is 4.2 J/g^°C. If light of frequency 3 109Hz is used to heat 400 gm of water from 20^°C to 40^°C, the number of photons needed will be

AB refers to an object and CD is its image formed. If AP and CP are the object and image distances from the mirror, choose the correct sign convention: 1. height of image=+ ve2. height of image=−ve3. height of object=+ve 4. height of object=−ve5. AP=+ve6. AP=−ve7. PC=+ve7. PC=+ve

a stone of mass 5kg falls from the top of a cliff 40m high and buries itself 2m deep in sand . find the average resistance offered by the sand and the time it takes to penetrate.

What would be the time period of a simple pendulum at the centre of the Earth?

22. Beckmann rearrangement provide information about which isomerization -optical -functional -position -geometry

Write the differences between mass and weight of an object.

Express gravitational force quantitatively, where m and M are masses and r is the distance between them.

explain spring force ?

What is week force

Explain free fall of a body and derive the equations caused due to free fall