13232 + Interview Questions in Physics Page 242 InterviewSolution

12051.	A force of 100N acts on the surface of area 10cm2 normally. What are the thrust and pressure on the surface?
Answer» A force of 100N acts on the surface of area 10cm2 normally. What are the thrust and pressure on the surface?

Discussion

12052.	Two earth-satellites are revolving in the same circular orbit round the centre of the earth. They must have the same
Answer» Two earth-satellites are revolving in the same circular orbit round the centre of the earth. They must have the same

Discussion

12053.	A body moving in a circular path has the zero displacement but there is an acceleration explain why?
Answer» A body moving in a circular path has the zero displacement but there is an acceleration explain why?

Discussion

12054.	Determine the surface tension forces in case an annular disc of radii r1 and r2 is placed on the water surface (surface tension of water T = 7×10−2N/m;π=227)
Answer» Determine the surface tension forces in case an annular disc of radii $r_{1}$ and $r_{2}$ is placed on the water surface (surface tension of water T = $7 \times 10^{- 2} N / m; π = \frac{22}{7}$ )

Discussion

12055.	Observe the following velocity-time graphs of two moving bodies P and Q and choose the correct option.
Answer» Observe the following velocity-time graphs of two moving bodies P and Q and choose the correct option.

12055.

Observe the following velocity-time graphs of two moving bodies P and Q and choose the correct option.

Answer»

Observe the following velocity-time graphs of two moving bodies P and Q and choose the correct option.

Discussion

12056.	If the angle of incidence is at 30∘. The angle of deflection, after reflecting 2 times is ___.
Answer» If the angle of incidence is at $30^{\circ}$ . The angle of deflection, after reflecting 2 times is ___.

12056.

If the angle of incidence is at 30∘. The angle of deflection, after reflecting 2 times is ___.

Answer»

If the angle of incidence is at $30^{\circ}$ . The angle of deflection, after reflecting 2 times is ___.

Discussion

12057.	In a uniform circular motion, which of the following options is true?
Answer» In a uniform circular motion, which of the following options is true?

Discussion

12058.	If two forces 6 N and 4 N are acting on the body as shown in the figure. The mass of the object is 2kg. What is the acceleration of the object?
Answer» If two forces 6 N and 4 N are acting on the body as shown in the figure. The mass of the object is 2kg. What is the acceleration of the object?

12058.

If two forces 6 N and 4 N are acting on the body as shown in the figure. The mass of the object is 2kg. What is the acceleration of the object?

Answer»

If two forces 6 N and 4 N are acting on the body as shown in the figure. The mass of the object is 2kg. What is the acceleration of the object?

Discussion

12059.	The unit of calorie is related to
Answer» The unit of calorie is related to

Discussion

12060.	A ball is thrown vertically upwards. It rises to a height of 10m and comes back to ground, then :
Answer» A ball is thrown vertically upwards. It rises to a height of 10m and comes back to ground, then :

Discussion

12061.	How are the virtual images produced by (i) concave mirror, (ii) plane mirror, (iii) convex mirror? [3 MARKS]
Answer» How are the virtual images produced by (i) concave mirror, (ii) plane mirror, (iii) convex mirror? [3 MARKS]

Discussion

12062.	A marble rolling on a smooth floor has an initial velocity of 0.4m/s . If the floor offers a retardation of 0.02ms−2 , calculate the time it will take to come to rest.
Answer» A marble rolling on a smooth floor has an initial velocity of $0.4m/s$ . If the floor offers a retardation of $0.02 {m s}^{- 2}$ , calculate the time it will take to come to rest.

Discussion

12063.	Four-fifths of a cylindrical block of wood float inside a liquid. If the relative density of wood is 0.7, find the density of the fluid.
Answer» Four-fifths of a cylindrical block of wood float inside a liquid. If the relative density of wood is 0.7, find the density of the fluid.

Discussion

12064.	Black hole exerts gravitational force, it means that attraction of light towards it is due to the gravitational force of black hole. So, does it mean that light also has mass?
Answer» Black hole exerts gravitational force, it means that attraction of light towards it is due to the gravitational force of black hole. So, does it mean that light also has mass?

Discussion

12065.	A car starts from rest and moves along the x axis with constant acceleration 5 m per second for 8 seconds it then continuous with constant velocity what distance will the car cover in 12 seconds since it started from the rest
Answer» A car starts from rest and moves along the x axis with constant acceleration 5 m per second for 8 seconds it then continuous with constant velocity what distance will the car cover in 12 seconds since it started from the rest

Discussion

12066.	Calculate the density of an object of volume 3m3 and mass 9 kg. State whether this object will float or sink in water. Give reason for your answer.
Answer» Calculate the density of an object of volume $3 m^{3}$ and mass 9 kg. State whether this object will float or sink in water. Give reason for your answer.

Discussion

12067.	The power of a motor is 40kW.At what speed can the motor raise a load of 20,000 N?
Answer» The power of a motor is 40kW.At what speed can the motor raise a load of 20,000 N?

Discussion

12068.	When the speed is constant the velocity may not be constant but when the velocity is constant the speed must be constant.why this happens?
Answer» When the speed is constant the velocity may not be constant but when the velocity is constant the speed must be constant.why this happens?

Discussion

12069.	A man is walking from east to west on a level rough surface road.the force on the man is directed A)from west to east B)from east to west C)along the north D)along the west
Answer» A man is walking from east to west on a level rough surface road.the force on the man is directed A)from west to east B)from east to west C)along the north D)along the west

12069.

A man is walking from east to west on a level rough surface road.the force on the man is directed A)from west to east B)from east to west C)along the north D)along the west

Answer»

A man is walking from east to west on a level rough surface road.the force on the man is directed

A)from west to east

B)from east to west

C)along the north

D)along the west

Discussion

12070.	A ray of light is incident on a glass-slab from air at an angle . Thickness and refractive index of glass-slab are‘t’ and ‘μa ’ respectively, Find the lateral displacement of the emergent ray respective to incident ray.
Answer» A ray of light is incident on a glass-slab from air at an angle . Thickness and refractive index of glass-slab are‘t’ and ‘ $μ_{a}$ ’ respectively, Find the lateral displacement of the emergent ray respective to incident ray.

12070.

A ray of light is incident on a glass-slab from air at an angle . Thickness and refractive index of glass-slab are‘t’ and ‘μa ’ respectively, Find the lateral displacement of the emergent ray respective to incident ray.

Answer»

A ray of light is incident on a glass-slab from air at an angle . Thickness and refractive index of glass-slab are‘t’ and ‘ $μ_{a}$ ’ respectively, Find the lateral displacement of the emergent ray respective to incident ray.

Discussion

12071.	How far would you travel moving at 12 m/s for 3.00 minutes?
Answer» How far would you travel moving at 12 m/s for 3.00 minutes?

Discussion

12072.	Which of the following shows the correct depiction of a circuit diagram?
Answer» Which of the following shows the correct depiction of a circuit diagram?

12072.

Which of the following shows the correct depiction of a circuit diagram?

Answer»

Which of the following shows the correct depiction of a circuit diagram?

Discussion

12073.	The sound travels fastest in_______.
Answer» The sound travels fastest in_______.

Discussion

12074.	An electric pump has 2kw power. How much water will the pump lift every minute to a height of10 m?
Answer» An electric pump has 2kw power. How much water will the pump lift every minute to a height of10 m?

Discussion

12075.	A battery of 12V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.5 Ω and 5 Ω. How much current would flow through the 5-Ω resistor?
Answer» A battery of 12V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.5 Ω and 5 Ω. How much current would flow through the 5-Ω resistor?

Discussion

12076.	The ultimate source of energy is : (a) Wood (b) wind (c) water (d) sun.
Answer» The ultimate source of energy is : (a) Wood (b) wind (c) water (d) sun.

12076.

The ultimate source of energy is : (a) Wood (b) wind (c) water (d) sun.

Answer»

The ultimate source of energy is :

(a) Wood (b) wind

(c) water (d) sun.

Discussion

12077.	A lump of 0.10kg of ice at −10∘C is put in 0.15kg of water at 20∘C. How much water and ice will be found in the mixture when it has reached in thermal equilibrium. (Specific heat of water =1kcalkg−1, specific heat of ice =0.50kcalkg−1 while its latent heat =80kcalkg−1)
Answer» A lump of $0.10 k g$ of ice at $- 10^{\circ} C$ is put in $0.15 k g$ of water at $20^{\circ} C$ . How much water and ice will be found in the mixture when it has reached in thermal equilibrium. (Specific heat of water $= 1 k c a l k g^{- 1}$ , specific heat of ice $= 0.50 k c a l k g^{- 1}$ while its latent heat $= 80 k c a l k g^{- 1}$ )

Discussion

12078.	A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from jar is pumped out ? Explain your answer.
Answer» A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from jar is pumped out ? Explain your answer.

Discussion

12079.	An oil – tanker explodes in the sea. At that instant an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. Speed of sound in sea water = 1520 m/s)
Answer» An oil – tanker explodes in the sea. At that instant an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. Speed of sound in sea water = 1520 m/s)

Discussion

12080.	A body is thrown vertically upwards with an initial velocity of 19.6 m/s. If accelaration due to gravity g=9.8 m/s2. Calculate the following: (i) The maximum height attained by the body. (ii) The time to reach the ground. [5 MARKS]
Answer» A body is thrown vertically upwards with an initial velocity of 19.6 m/s. If accelaration due to gravity $g = 9.8 m / s^{2}$ . Calculate the following: (i) The maximum height attained by the body. (ii) The time to reach the ground. [5 MARKS]

Discussion

12081.	Which of the following mirror can form a full size virtual image, if the aperture of the mirror is small?
Answer» Which of the following mirror can form a full size virtual image, if the aperture of the mirror is small?

Discussion

12082.	A body of mass 2 kg having a velocity of 2 ms−1 is brought to rest within a distance of 2 m. Find the magnitude of force acting on the body.
Answer» A body of mass $2 k g$ having a velocity of $2 m s^{- 1}$ is brought to rest within a distance of $2 m$ . Find the magnitude of force acting on the body.

Discussion

12083.	Can an object which has moved through certain distance have a zero displacement? Support your answer with an example. [2 MARKS]
Answer» Can an object which has moved through certain distance have a zero displacement? Support your answer with an example. [2 MARKS]

Discussion

12084.	A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the child ?
Answer» A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the child ?

Discussion

12085.	Although we say that the mass of a body is constant it is not entirely true. under what circumstances will the mass of body vary.
Answer» Although we say that the mass of a body is constant it is not entirely true. under what circumstances will the mass of body vary.

Discussion

12086.	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

12087.	Average velocity of a particle moving in a straight line, with constant acceleration a and initial velocity u in first t seconds is:
Answer» Average velocity of a particle moving in a straight line, with constant acceleration $a$ and initial velocity $u$ in first $t$ seconds is:

Discussion

12088.	A cell is used to ___.
Answer» A cell is used to ___.

Discussion

12089.	The thrust F is exerted on area 2 A and thrust 3 F is exerted on area A2. Find the ratio of pressure exerted.
Answer» The thrust $F$ is exerted on area $2 A$ and thrust $3 F$ is exerted on area $\frac{A}{2}$ . Find the ratio of pressure exerted.

Discussion

12090.	A train is moving with a speed of 120km/h. How much distance will it cover in 30 seconds?
Answer» A train is moving with a speed of $120 k m / h$ . How much distance will it cover in $30$ seconds?

12090.

A train is moving with a speed of 120km/h. How much distance will it cover in 30 seconds?

Answer»

A train is moving with a speed of $120 k m / h$ . How much distance will it cover in $30$ seconds?

Discussion

12091.	The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?
Answer» The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?

Discussion

12092.	Choose the correct statement regarding the conversion of ice into water.
Answer» Choose the correct statement regarding the conversion of ice into water.

Discussion

12093.	Certain force acting on a mass changes its velocity from 5m/s to 2m/s in 3s. Calculate the force.
Answer» Certain force acting on a mass changes its velocity from 5m/s to 2m/s in 3s. Calculate the force.

Discussion

12094.	A thief is running on a train with a speed of 12 km/hr. The police car is moving with the speed of 80 km/hr. If the speed of the train is 60 km/hr. What is the speed of thief with respect to the police car ?
Answer» A thief is running on a train with a speed of 12 km/hr. The police car is moving with the speed of 80 km/hr. If the speed of the train is 60 km/hr. What is the speed of thief with respect to the police car ?

Discussion

12095.	Two resistors of resistances 5Ω and 12Ω are connected in series. The equivalent resistance is:
Answer» Two resistors of resistances $5 Ω a n d 12 Ω$ are connected in series. The equivalent resistance is:

Discussion

12096.	Cochlea in the inner ear contains:
Answer» Cochlea in the inner ear contains:

Discussion

12097.	An electron moving with a velocity of 5×104 ms−1 enters into a uniform electric field and acquires a uniform acceleration of 104 ms−2 in the direction of its initial motion. How much distance the electron would cover in 5 s?
Answer» An electron moving with a velocity of $5 \times 10^{4} m s^{- 1}$ enters into a uniform electric field and acquires a uniform acceleration of $10^{4} m s^{- 2}$ in the direction of its initial motion. How much distance the electron would cover in $5 s$ ?

Discussion

12098.	An object may have :- A) varying speed without having varying velocity. B) varying velocity without having varying speed. C) non zero acceleration without having varying velocity. D) non zero acceleration without having varying speed. Explain your answer.
Answer» An object may have :- A) varying speed without having varying velocity. B) varying velocity without having varying speed. C) non zero acceleration without having varying velocity. D) non zero acceleration without having varying speed. Explain your answer.

12098.

An object may have :- A) varying speed without having varying velocity. B) varying velocity without having varying speed. C) non zero acceleration without having varying velocity. D) non zero acceleration without having varying speed. Explain your answer.

Answer»

An object may have :-

A) varying speed without having varying velocity.

B) varying velocity without having varying speed.

C) non zero acceleration without having varying velocity.

D) non zero acceleration without having varying speed.

Explain your answer.

Discussion

12099.	what is the order of magnitude of a physical quantity ?
Answer» what is the order of magnitude of a physical quantity ?

Discussion

12100.	Explain that Newton's 1st law of motion is also known as the law of inertia.
Answer» Explain that Newton's 1st law of motion is also known as the law of inertia.

Discussion

Explore topic-wise InterviewSolutions in .

A force of 100N acts on the surface of area 10cm2 normally. What are the thrust and pressure on the surface?

Two earth-satellites are revolving in the same circular orbit round the centre of the earth. They must have the same

A body moving in a circular path has the zero displacement but there is an acceleration explain why?

Determine the surface tension forces in case an annular disc of radii r1 and r2 is placed on the water surface (surface tension of water T = 7×10−2N/m;π=227)

Observe the following velocity-time graphs of two moving bodies P and Q and choose the correct option.

If the angle of incidence is at 30∘. The angle of deflection, after reflecting 2 times is ___.

In a uniform circular motion, which of the following options is true?

If two forces 6 N and 4 N are acting on the body as shown in the figure. The mass of the object is 2kg. What is the acceleration of the object?

The unit of calorie is related to

A ball is thrown vertically upwards. It rises to a height of 10m and comes back to ground, then :

How are the virtual images produced by (i) concave mirror, (ii) plane mirror, (iii) convex mirror? [3 MARKS]

A marble rolling on a smooth floor has an initial velocity of 0.4m/s . If the floor offers a retardation of 0.02ms−2 , calculate the time it will take to come to rest.

Four-fifths of a cylindrical block of wood float inside a liquid. If the relative density of wood is 0.7, find the density of the fluid.

Black hole exerts gravitational force, it means that attraction of light towards it is due to the gravitational force of black hole. So, does it mean that light also has mass?

A car starts from rest and moves along the x axis with constant acceleration 5 m per second for 8 seconds it then continuous with constant velocity what distance will the car cover in 12 seconds since it started from the rest

Calculate the density of an object of volume 3m3 and mass 9 kg. State whether this object will float or sink in water. Give reason for your answer.

The power of a motor is 40kW.At what speed can the motor raise a load of 20,000 N?

When the speed is constant the velocity may not be constant but when the velocity is constant the speed must be constant.why this happens?

A man is walking from east to west on a level rough surface road.the force on the man is directed A)from west to east B)from east to west C)along the north D)along the west

A ray of light is incident on a glass-slab from air at an angle . Thickness and refractive index of glass-slab are‘t’ and ‘μa ’ respectively, Find the lateral displacement of the emergent ray respective to incident ray.

How far would you travel moving at 12 m/s for 3.00 minutes?

Which of the following shows the correct depiction of a circuit diagram?

The sound travels fastest in_______.

An electric pump has 2kw power. How much water will the pump lift every minute to a height of10 m?

A battery of 12V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.5 Ω and 5 Ω. How much current would flow through the 5-Ω resistor?

The ultimate source of energy is : (a) Wood (b) wind (c) water (d) sun.

A lump of 0.10kg of ice at −10∘C is put in 0.15kg of water at 20∘C. How much water and ice will be found in the mixture when it has reached in thermal equilibrium. (Specific heat of water =1kcalkg−1, specific heat of ice =0.50kcalkg−1 while its latent heat =80kcalkg−1)

A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from jar is pumped out ? Explain your answer.

A body is thrown vertically upwards with an initial velocity of 19.6 m/s. If accelaration due to gravity g=9.8 m/s2. Calculate the following: (i) The maximum height attained by the body. (ii) The time to reach the ground. [5 MARKS]

Which of the following mirror can form a full size virtual image, if the aperture of the mirror is small?

A body of mass 2 kg having a velocity of 2 ms−1 is brought to rest within a distance of 2 m. Find the magnitude of force acting on the body.

Can an object which has moved through certain distance have a zero displacement? Support your answer with an example. [2 MARKS]

A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the child ?

Although we say that the mass of a body is constant it is not entirely true. under what circumstances will the mass of body vary.

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

Average velocity of a particle moving in a straight line, with constant acceleration a and initial velocity u in first t seconds is:

A cell is used to ___.

The thrust F is exerted on area 2 A and thrust 3 F is exerted on area A2. Find the ratio of pressure exerted.

A train is moving with a speed of 120km/h. How much distance will it cover in 30 seconds?

The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?

Choose the correct statement regarding the conversion of ice into water.

Certain force acting on a mass changes its velocity from 5m/s to 2m/s in 3s. Calculate the force.

A thief is running on a train with a speed of 12 km/hr. The police car is moving with the speed of 80 km/hr. If the speed of the train is 60 km/hr. What is the speed of thief with respect to the police car ?

Two resistors of resistances 5Ω and 12Ω are connected in series. The equivalent resistance is:

Cochlea in the inner ear contains:

An electron moving with a velocity of 5×104 ms−1 enters into a uniform electric field and acquires a uniform acceleration of 104 ms−2 in the direction of its initial motion. How much distance the electron would cover in 5 s?

An object may have :- A) varying speed without having varying velocity. B) varying velocity without having varying speed. C) non zero acceleration without having varying velocity. D) non zero acceleration without having varying speed. Explain your answer.

what is the order of magnitude of a physical quantity ?

Explain that Newton's 1st law of motion is also known as the law of inertia.