6277 + Interview Questions in Physics Page 8 InterviewSolution

351.	12. Three blocks P , Q and R of masses 5 kg , 4 kg and 3 kg respectively are connected by a light inextensible string and they are moved on a smooth horizontal floor . If a force of 24 N is applied to the string connected to R what will be the tensions T1 and T2 in the string?
Answer» 12. Three blocks P , Q and R of masses 5 kg , 4 kg and 3 kg respectively are connected by a light inextensible string and they are moved on a smooth horizontal floor . If a force of 24 N is applied to the string connected to R what will be the tensions T1 and T2 in the string?

Discussion

352.	What is the density of wet air ( in g/L) which have a partial pressure of water of 22.5 torr at 1 atm and 300 K? (Given: vapour pressure of H2O is 30 torr and the average molar mass of air is 29 g)
Answer» What is the density of wet air ( in g/L) which have a partial pressure of water of 22.5 torr at 1 atm and $300 K$ ? $($ Given: vapour pressure of $H_{2} O$ is 30 torr and the average molar mass of air is $29 g)$

Discussion

353.	Name the given device which is used to measure the atmospheric pressure.
Answer» Name the given device which is used to measure the atmospheric pressure.

353.

Name the given device which is used to measure the atmospheric pressure.

Answer»

Name the given device which is used to measure the atmospheric pressure.

Discussion

354.	What is Periodic motion
Answer» What is Periodic motion

Discussion

355.	The graph of magnitude of object distance and magnitude of image distance for the various position of an object in front of a convex lens is shown in the figure.The object distance & image distance is in cm, based on graph the focal length of lens is :
Answer» The graph of magnitude of object distance and magnitude of image distance for the various position of an object in front of a convex lens is shown in the figure. The object distance & image distance is in $cm$ , based on graph the focal length of lens is :

Discussion

356.	Concave lense of ref index. 1.5 immersed in carbon di sulfate of refractive index 1.6 will it A) convergent with 7.5B) divergent with 7.5C) convergent with 8D) divergent with 8
Answer» Concave lense of ref index. 1.5 immersed in carbon di sulfate of refractive index 1.6 will it A) convergent with 7.5 B) divergent with 7.5 C) convergent with 8 D) divergent with 8

Discussion

357.	Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Answer» Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

Discussion

358.	Explain the term ' interconversion of matter '- with ice as a starting material.state the conversation of a substance on heating from - a] solid state to liquid state b] liquid state to vapour state c] vapour state to liquid state d] liquid state to solid state
Answer» Explain the term ' interconversion of matter '- with ice as a starting material.state the conversation of a substance on heating from - a] solid state to liquid state b] liquid state to vapour state c] vapour state to liquid state d] liquid state to solid state

358.

Explain the term ' interconversion of matter '- with ice as a starting material.state the conversation of a substance on heating from - a] solid state to liquid state b] liquid state to vapour state c] vapour state to liquid state d] liquid state to solid state

Answer»

Explain the term ' interconversion of matter '- with ice as a starting material.state the conversation of a substance on heating from -

a] solid state to liquid state

b] liquid state to vapour state

c] vapour state to liquid state

d] liquid state to solid state

Discussion

359.	A spring of force constant K is first stretched by distance a from its natural length and then further by distance b the work done in stretching the part b is
Answer» A spring of force constant K is first stretched by distance a from its natural length and then further by distance b the work done in stretching the part b is

Discussion

360.	A person moves 20m north east then moves 20 m west and than again 20m north east and stops. The magnitude of displacement of the person is
Answer» A person moves 20m north east then moves 20 m west and than again 20m north east and stops. The magnitude of displacement of the person is

Discussion

361.	60.Two isolated metallic solid spheres of radii R and 2R are charged such that both of them have same charge density d. The spheres are located far away from each other, and connected by a thin conducting wire. Then the new charge density on the bigger sphere is
Answer» 60.Two isolated metallic solid spheres of radii R and 2R are charged such that both of them have same charge density d. The spheres are located far away from each other, and connected by a thin conducting wire. Then the new charge density on the bigger sphere is

Discussion

362.	Which of the following uses more energy, a 250W TV set in 2 h, or a 1000 W heater in 30 minutes?
Answer» Which of the following uses more energy, a 250W TV set in 2 h, or a 1000 W heater in 30 minutes?

Discussion

363.	A diverging mirror is
Answer» A diverging mirror is

Discussion

364.	Under which of the following conditions a concave mirror can form a real image that is larger than the object?
Answer» Under which of the following conditions a concave mirror can form a real image that is larger than the object?

Discussion

365.	If a cone is cut into two parts by a horizontal plane passing through the mid-point of itsaxis, the ratio of the volumes of upper and lower part is
Answer» If a cone is cut into two parts by a horizontal plane passing through the mid-point of itsaxis, the ratio of the volumes of upper and lower part is

Discussion

366.	Which of the following instruments, can be used to form patterns like below?
Answer» Which of the following instruments, can be used to form patterns like below?

Discussion

367.	A pendulum makes 135 oscillations in a duration of 15 seconds. The time period of the pendulum is .
Answer» A pendulum makes 135 oscillations in a duration of 15 seconds. The time period of the pendulum is .

Discussion

368.	In which of the following cases, the distance and the magnitude of displacement are equal ?
Answer» In which of the following cases, the distance and the magnitude of displacement are equal ?

Discussion

369.	An image which cannot be formed on a screen is known as ___.
Answer» An image which cannot be formed on a screen is known as ___.

Discussion

370.	What are the difference between thermal expansion and thermal equilibrium
Answer» What are the difference between thermal expansion and thermal equilibrium

Discussion

371.	Write true or false for each statement: (a) Equal volumes of the two different substances have equal masses. (b) The density of a piece of brass will change by changing its size or shape. (c) The density of a liquid decreases with an increase in its temperature. (d) Relative density of water is 1.0. (e) Relative density of a substance is expressed in g cm−3. (f) When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the displaced by it. (g) A body experiences the same buoyant force while floating in water or alcohol. (h) A body experiences the same buoyant force when it floats or sinks in water. (i) A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part. (j) A body while floating sinks in a liquid of low density than in high density.
Answer» Write true or false for each statement: (a) Equal volumes of the two different substances have equal masses. (b) The density of a piece of brass will change by changing its size or shape. (c) The density of a liquid decreases with an increase in its temperature. (d) Relative density of water is 1.0. (e) Relative density of a substance is expressed in g $c m^{-} 3$ . (f) When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the displaced by it. (g) A body experiences the same buoyant force while floating in water or alcohol. (h) A body experiences the same buoyant force when it floats or sinks in water. (i) A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part. (j) A body while floating sinks in a liquid of low density than in high density.

371.

Write true or false for each statement: (a) Equal volumes of the two different substances have equal masses. (b) The density of a piece of brass will change by changing its size or shape. (c) The density of a liquid decreases with an increase in its temperature. (d) Relative density of water is 1.0. (e) Relative density of a substance is expressed in g cm−3. (f) When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the displaced by it. (g) A body experiences the same buoyant force while floating in water or alcohol. (h) A body experiences the same buoyant force when it floats or sinks in water. (i) A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part. (j) A body while floating sinks in a liquid of low density than in high density.

Answer»

Write true or false for each statement:

(a) Equal volumes of the two different substances have equal masses.

(b) The density of a piece of brass will change by changing its size or shape.

(c) The density of a liquid decreases with an increase in its temperature.

(d) Relative density of water is 1.0.

(e) Relative density of a substance is expressed in g $c m^{-} 3$ .

(f) When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the displaced by it.

(g) A body experiences the same buoyant force while floating in water or alcohol.

(h) A body experiences the same buoyant force when it floats or sinks in water.

(i) A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part.

(j) A body while floating sinks in a liquid of low density than in high density.

Discussion

372.	12. area of sector of a circle is 1/9 of the area ofvthe circle .find the degree measure of its minor arc
Answer» 12. area of sector of a circle is 1/9 of the area ofvthe circle .find the degree measure of its minor arc

Discussion

373.	A massless uniform rod is subjected to force F at its free end as shown in figure.The ratio of tensile stress at plane P1 to stress at P2 is
Answer» A massless uniform rod is subjected to force $F$ at its free end as shown in figure. The ratio of tensile stress at plane $P_{1}$ to stress at $P_{2}$ is

Discussion

374.	A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 1000∘ C. Which one of these will cool first
Answer» A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of $1000^{\circ} C$ . Which one of these will cool first

374.

A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 1000∘ C. Which one of these will cool first

Answer»

A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of $1000^{\circ} C$ . Which one of these will cool first

Discussion

375.	The environment is facing greatest danger from
Answer» The environment is facing greatest danger from

Discussion

376.	For the graph given below choose the correct option : TableATableBa) LineAi) Accelerated Motionb) LineBii) Constant velocity (high magnitude)c) CurveCiii) At restd) LineEiv) Constant Velocity (low magnitude)
Answer» For the graph given below choose the correct option : $\begin{matrix} T a b l e A & T a b l e B a) L i n e A & i) A c c e l e r a t e d M o t i o n b) L i n e B & i i) C o n s t a n t v e l o c i t y (h i g h m a g n i t u d e) c) C u r v e C & i i i) A t r e s t d) L i n e E & i v) C o n s t a n t V e l o c i t y (l o w m a g n i t u d e) \end{matrix}$

376.

For the graph given below choose the correct option : TableATableBa) LineAi) Accelerated Motionb) LineBii) Constant velocity (high magnitude)c) CurveCiii) At restd) LineEiv) Constant Velocity (low magnitude)

Answer»

For the graph given below choose the correct option :

$\begin{matrix} T a b l e A & T a b l e B a) L i n e A & i) A c c e l e r a t e d M o t i o n b) L i n e B & i i) C o n s t a n t v e l o c i t y (h i g h m a g n i t u d e) c) C u r v e C & i i i) A t r e s t d) L i n e E & i v) C o n s t a n t V e l o c i t y (l o w m a g n i t u d e) \end{matrix}$

Discussion

377.	Find the surface area of a circular park having diameter 50m. (Take π=3.14)
Answer» Find the surface area of a circular park having diameter 50m. (Take $π = 3.14$ )

Discussion

378.	A body when immersed in kerosene sinks. What relation could be established between the density of body and kerosene?
Answer» A body when immersed in kerosene sinks. What relation could be established between the density of body and kerosene?

Discussion

379.	Write equation for stationary wave displacement
Answer» Write equation for stationary wave displacement

Discussion

380.	The main scale of a vernier calliper has n division / cm.if ndivisions of the vernier scale coincide with n -1 divisions of main scale the least count of vernier caliper is
Answer» The main scale of a vernier calliper has n division / cm.if ndivisions of the vernier scale coincide with n -1 divisions of main scale the least count of vernier caliper is

Discussion

381.	Full form of MCB is :
Answer» Full form of MCB is :

Discussion

382.	What is an echo?
Answer» What is an echo?

Discussion

383.	25. Two particles A and B start from rest and move for equal time on a straight line.The partice A has an acceleration &quota" for the first half of the total time and &quot2a" for the second half.The particle B has an acceleration &quot2a" for the first half and &quota" for the second half.Which particle has covered larger distance?
Answer» 25. Two particles A and B start from rest and move for equal time on a straight line.The partice A has an acceleration "a" for the first half of the total time and "2a" for the second half.The particle B has an acceleration "2a" for the first half and "a" for the second half.Which particle has covered larger distance?

Discussion

384.	The radius of the earth at the poles is 6357 kilometres and the the radius at the equator is 6378 kilometres. Calculate the percentage change in the weight of a body when it is taken from the equator to the poles.
Answer» The radius of the earth at the poles is 6357 kilometres and the the radius at the equator is 6378 kilometres. Calculate the percentage change in the weight of a body when it is taken from the equator to the poles.

Discussion

385.	If the length of two rods is 9.75 m and 8.80 m then the difference between their lengths is
Answer» If the length of two rods is 9.75 m and 8.80 m then the difference between their lengths is

Discussion

386.

Match the following units to their corresponding symbols? Name of unit Symbol of unit (i) Metre (a) kg (ii) Kilogram (b) m (iii) Second (c) s

Answer»

Match the following units to their corresponding symbols?

Name of unit	Symbol of unit
(i) Metre	(a) kg
(ii) Kilogram	(b) m
(iii) Second	(c) s

Discussion

387.	A ray of light is incident on a plane mirror at an angle of 30∘ with its normal. The deviation produced in the ray is
Answer» A ray of light is incident on a plane mirror at an angle of $30^{\circ}$ with its normal. The deviation produced in the ray is

Discussion

388.	An aluminium rod with another alloy are bonded together at 20∘C to form a bimetal sensor. The length of the bimetal rod at 20∘C is 10 m. How much the rod will expand when the temperature is changed from 0∘C to 100∘C?The expansion coefficient of aluminium is 2.5×10−6/∘C.
Answer» An aluminium rod with another alloy are bonded together at $20^{\circ} C$ to form a bimetal sensor. The length of the bimetal rod at $20^{\circ} C$ is $10 m$ . How much the rod will expand when the temperature is changed from $0^{\circ} C$ to $100^{\circ} C ?$ The expansion coefficient of aluminium is $2.5 \times 10^{- 6} /^{\circ} C .$

Discussion

389.	Which cell is used in Kolbe's electrolytic reaction?
Answer» Which cell is used in Kolbe's electrolytic reaction?

Discussion

390.	The passage of an electric current through a solution causes effects
Answer» The passage of an electric current through a solution causes effects

Discussion

391.	Why are we not able to drink water from a straw with a small hole?
Answer» Why are we not able to drink water from a straw with a small hole?

Discussion

392.	Which component in an electric circuit(a) supplies electricity? (b) has the power to stop the flow of electric current? (c) provides a path for the flow of electric current?
Answer» Which component in an electric circuit (a) supplies electricity? (b) has the power to stop the flow of electric current? (c) provides a path for the flow of electric current?

Discussion

393.	An observer on the sea shore observes 54 waves reaching the coast per minute. If the wavelength is 10 m, the velocity of the waves is
Answer» An observer on the sea shore observes 54 waves reaching the coast per minute. If the wavelength is $10 m$ , the velocity of the waves is

Discussion

394.	Q1.Two trucks , one loaded (A) & other unloaded (B) are moving & have same kinetic energy . The mass of A is double that of B . Brakes are applied to both & are brought to rest . If the distance covered by A before coming to rest is x1 & that of B is x2 , then ? a) x1 = x2 (b) x1 = 2 • x2 (c) 2 • x1 = x2 (d) x1 = 4 • x2?
Answer» Q1.Two trucks , one loaded (A) & other unloaded (B) are moving & have same kinetic energy . The mass of A is double that of B . Brakes are applied to both & are brought to rest . If the distance covered by A before coming to rest is x1 & that of B is x2 , then ? a) x1 = x2 (b) x1 = 2 • x2 (c) 2 • x1 = x2 (d) x1 = 4 • x2?

Discussion

395.	Which of the following is generally used to measure body temperature?
Answer» Which of the following is generally used to measure body temperature?

Discussion

396.	what is friction
Answer» what is friction

Discussion

397.	A particle moving in a straight line and it's position x at time t is given by x² = 2 + t. It's acceleration is given by
Answer» A particle moving in a straight line and it's position x at time t is given by x² = 2 + t. It's acceleration is given by

Discussion

398.	two particles revolving in circular paths under mutual gravitational force. If ratio of their kinetic energy is 1:8, then what is the ratio of their masses?
Answer» two particles revolving in circular paths under mutual gravitational force. If ratio of their kinetic energy is 1:8, then what is the ratio of their masses?

Discussion

399.	Water has __ (low/high) specific heat which makes it as an excellent cooling agent.
Answer» Water has __ (low/high) specific heat which makes it as an excellent cooling agent.

Discussion

400.	The leaves of an electroscope are made up of plastic. Will this electroscope work? Explain with reasons.
Answer» The leaves of an electroscope are made up of plastic. Will this electroscope work? Explain with reasons.

Discussion

Explore topic-wise InterviewSolutions in .

12. Three blocks P , Q and R of masses 5 kg , 4 kg and 3 kg respectively are connected by a light inextensible string and they are moved on a smooth horizontal floor . If a force of 24 N is applied to the string connected to R what will be the tensions T1 and T2 in the string?

What is the density of wet air ( in g/L) which have a partial pressure of water of 22.5 torr at 1 atm and 300 K? (Given: vapour pressure of H2O is 30 torr and the average molar mass of air is 29 g)

Name the given device which is used to measure the atmospheric pressure.

What is Periodic motion

The graph of magnitude of object distance and magnitude of image distance for the various position of an object in front of a convex lens is shown in the figure.The object distance &amp; image distance is in cm, based on graph the focal length of lens is :

Concave lense of ref index. 1.5 immersed in carbon di sulfate of refractive index 1.6 will it A) convergent with 7.5B) divergent with 7.5C) convergent with 8D) divergent with 8

Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

Explain the term ' interconversion of matter '- with ice as a starting material.state the conversation of a substance on heating from - a] solid state to liquid state b] liquid state to vapour state c] vapour state to liquid state d] liquid state to solid state

A spring of force constant K is first stretched by distance a from its natural length and then further by distance b the work done in stretching the part b is

A person moves 20m north east then moves 20 m west and than again 20m north east and stops. The magnitude of displacement of the person is

60.Two isolated metallic solid spheres of radii R and 2R are charged such that both of them have same charge density d. The spheres are located far away from each other, and connected by a thin conducting wire. Then the new charge density on the bigger sphere is

Which of the following uses more energy, a 250W TV set in 2 h, or a 1000 W heater in 30 minutes?

A diverging mirror is

Under which of the following conditions a concave mirror can form a real image that is larger than the object?

If a cone is cut into two parts by a horizontal plane passing through the mid-point of itsaxis, the ratio of the volumes of upper and lower part is

Which of the following instruments, can be used to form patterns like below?

A pendulum makes 135 oscillations in a duration of 15 seconds. The time period of the pendulum is .

In which of the following cases, the distance and the magnitude of displacement are equal ?

An image which cannot be formed on a screen is known as ___.

What are the difference between thermal expansion and thermal equilibrium

12. area of sector of a circle is 1/9 of the area ofvthe circle .find the degree measure of its minor arc

A massless uniform rod is subjected to force F at its free end as shown in figure.The ratio of tensile stress at plane P1 to stress at P2 is

A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 1000∘ C. Which one of these will cool first

The environment is facing greatest danger from

For the graph given below choose the correct option : TableATableBa) LineAi) Accelerated Motionb) LineBii) Constant velocity (high magnitude)c) CurveCiii) At restd) LineEiv) Constant Velocity (low magnitude)

Find the surface area of a circular park having diameter 50m. (Take π=3.14)

A body when immersed in kerosene sinks. What relation could be established between the density of body and kerosene?

Write equation for stationary wave displacement

The main scale of a vernier calliper has n division / cm.if ndivisions of the vernier scale coincide with n -1 divisions of main scale the least count of vernier caliper is

Full form of MCB is :

What is an echo?

The radius of the earth at the poles is 6357 kilometres and the the radius at the equator is 6378 kilometres. Calculate the percentage change in the weight of a body when it is taken from the equator to the poles.

If the length of two rods is 9.75 m and 8.80 m then the difference between their lengths is

Match the following units to their corresponding symbols? Name of unit Symbol of unit (i) Metre (a) kg (ii) Kilogram (b) m (iii) Second (c) s

A ray of light is incident on a plane mirror at an angle of 30∘ with its normal. The deviation produced in the ray is

An aluminium rod with another alloy are bonded together at 20∘C to form a bimetal sensor. The length of the bimetal rod at 20∘C is 10 m. How much the rod will expand when the temperature is changed from 0∘C to 100∘C?The expansion coefficient of aluminium is 2.5×10−6/∘C.

Which cell is used in Kolbe's electrolytic reaction?

The passage of an electric current through a solution causes effects

Why are we not able to drink water from a straw with a small hole?

Which component in an electric circuit(a) supplies electricity? (b) has the power to stop the flow of electric current? (c) provides a path for the flow of electric current?

An observer on the sea shore observes 54 waves reaching the coast per minute. If the wavelength is 10 m, the velocity of the waves is

Which of the following is generally used to measure body temperature?

what is friction

A particle moving in a straight line and it's position x at time t is given by x² = 2 + t. It's acceleration is given by

two particles revolving in circular paths under mutual gravitational force. If ratio of their kinetic energy is 1:8, then what is the ratio of their masses?

Water has __ (low/high) specific heat which makes it as an excellent cooling agent.

The leaves of an electroscope are made up of plastic. Will this electroscope work? Explain with reasons.

The graph of magnitude of object distance and magnitude of image distance for the various position of an object in front of a convex lens is shown in the figure.The object distance & image distance is in cm, based on graph the focal length of lens is :