13232 + Interview Questions in Physics Page 15 InterviewSolution

701.	write any two difference between Audible & ultrasonic sound
Answer» write any two difference between Audible & ultrasonic sound

Discussion

702.	A piece of aluminum of volume 200 cm3 and density 2.7g/cm3 is completely immersed in kerosene. Determine the up thrust exerted on the piece of aluminum and also determine how much it will in kerosene. Explain the steps with reasons.
Answer» A piece of aluminum of volume 200 cm³and density 2.7g/cm³is completely immersed in kerosene. Determine the up thrust exerted on the piece of aluminum and also determine how much it will in kerosene. Explain the steps with reasons.

Discussion

703.	An object moves with a uniform velocity when the net force acting on it is_______.
Answer» An object moves with a uniform velocity when the net force acting on it is_______.

Discussion

704.	A body of mass 10kg is hanging from another body of mass 15kg. The combination is pulled up by a string with an acceleration of . 1.2m−2 Find the tensions (in N) at A and B points as shown in figure (Take g=9.8m/s2).
Answer» A body of mass 10kg is hanging from another body of mass 15kg. The combination is pulled up by a string with an acceleration of . $1.2 m^{- 2}$ Find the tensions (in N) at A and B points as shown in figure $(T a k e g = 9.8 m / s^{2})$ .

704.

A body of mass 10kg is hanging from another body of mass 15kg. The combination is pulled up by a string with an acceleration of . 1.2m−2 Find the tensions (in N) at A and B points as shown in figure (Take g=9.8m/s2).

Answer»

A body of mass 10kg is hanging from another body of mass 15kg. The combination is pulled up by a string with an acceleration of . $1.2 m^{- 2}$ Find the tensions (in N) at A and B points as shown in figure $(T a k e g = 9.8 m / s^{2})$ .

Discussion

705.	A wavefront AB is refracted from medium 1 to medium 2. The refractive index of medium 2 is less than that of medium 1. Which of the following wavefronts in medium 2, show the refracted wavefront?
Answer» A wavefront $A B$ is refracted from medium $1$ to medium $2$ . The refractive index of medium $2$ is less than that of medium $1$ . Which of the following wavefronts in medium $2$ , show the refracted wavefront?

Discussion

706.	A solid weighs 100 gf (gram force) in air and 90 gf (gram force) when completely immersed in water. Calculate the volume of the solid.
Answer» A solid weighs 100 gf (gram force) in air and 90 gf (gram force) when completely immersed in water. Calculate the volume of the solid.

Discussion

707.	Show the derivation of the formula - Velocity of the sound =sqrt(aP/D). Whereas a the specific heat P is the pressure. D is the density or molecular inertia.
Answer» Show the derivation of the formula - Velocity of the sound =sqrt(aP/D). Whereas a the specific heat P is the pressure. D is the density or molecular inertia.

Discussion

708.	what is buoyancy and buoyant force ?
Answer» what is buoyancy and buoyant force ?

Discussion

709.	If momentum of an object is increased by 10% then it's kinetic energy will increase by
Answer» If momentum of an object is increased by 10% then it's kinetic energy will increase by

Discussion

710.	Gravitational force does not depend on:
Answer» Gravitational force does not depend on:

Discussion

711.	Name the physical quantity obtained by dividing 'Distance travelled' by 'Time taken' to travel that distance.
Answer» Name the physical quantity obtained by dividing 'Distance travelled' by 'Time taken' to travel that distance.

Discussion

712.	57. Vertical tank open at the top is filled with a liquid and restes on a smooth horizontal surface a small hole is opened at the centre of one side of the tank. the area of cross section of the tank is N times the area of the hole where N is a large number neglect the mass of the tank itself the initial acceleration of the tank is
Answer» 57. Vertical tank open at the top is filled with a liquid and restes on a smooth horizontal surface a small hole is opened at the centre of one side of the tank. the area of cross section of the tank is N times the area of the hole where N is a large number neglect the mass of the tank itself the initial acceleration of the tank is

Discussion

713.	97. A projectile is projected at an angle of 45 degree with the horizontal with a speed of 15 under root 2 m/s,from the top of height 50m .Find the horizontal displacement of the particle till it reaches the ground.(take g=10m/s2)
Answer» 97. A projectile is projected at an angle of 45 degree with the horizontal with a speed of 15 under root 2 m/s,from the top of height 50m .Find the horizontal displacement of the particle till it reaches the ground.(take g=10m/s2)

Discussion

714.	A train moving at a constant speed of 54kmph moves eastwards for 30min then north for 40min find avg velocity
Answer» A train moving at a constant speed of 54kmph moves eastwards for 30min then north for 40min find avg velocity

Discussion

715.	A boy of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s.Calculate : 1-the force of gravity acting on the boy 2-the work done by him against the gravity 3-the power sent by the boy (take g=10m 1/s²)
Answer» A boy of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s.Calculate : 1-the force of gravity acting on the boy 2-the work done by him against the gravity 3-the power sent by the boy (take g=10m 1/s²)

715.

A boy of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s.Calculate : 1-the force of gravity acting on the boy 2-the work done by him against the gravity 3-the power sent by the boy (take g=10m 1/s²)

Answer»

A boy of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s.Calculate :

1-the force of gravity acting on the boy

2-the work done by him against the gravity

3-the power sent by the boy

(take g=10m 1/s²)

Discussion

716.	90. If U= 6xcube-48x the. What will be the expression for (1) Force (2) Stable &unstable equilibrium (3) potential energy in these position
Answer» 90. If U= 6xcube-48x the. What will be the expression for (1) Force (2) Stable &unstable equilibrium (3) potential energy in these position

Discussion

717.	A wooden block of mass 60 kg and dimensions 30 cm×40 cm×50 cm is kept on horizontal floor. If P1 is the maximum pressure exerted on the floor by the block and P2 is the minimum pressure exerted on the floor by the block, then
Answer» A wooden block of mass 60 kg and dimensions $30 c m \times 40 c m \times 50 c m$ is kept on horizontal floor. If $P_{1}$ is the maximum pressure exerted on the floor by the block and $P_{2}$ is the minimum pressure exerted on the floor by the block, then

Discussion

718.	A bar magnet is kept parallel to the earth’s magnetic field then number of neutral points obtained in the horizontal plane containing the bar magnet isOptions:Infinite1 24
Answer» A bar magnet is kept parallel to the earth’s magnetic field then number of neutral points obtained in the horizontal plane containing the bar magnet is Options: Infinite 1 2 4

Discussion

719.	Is the density of all elements and compounds (substances) different? Are there any elements or compounds which have same density.
Answer» Is the density of all elements and compounds (substances) different? Are there any elements or compounds which have same density.

Discussion

720.	The value of gravitational potential energy at the reference level would be.
Answer» The value of gravitational potential energy at the reference level would be.

Discussion

721.	Sound waves with frequency smaller than 20 Hz are called:
Answer» Sound waves with frequency smaller than 20 Hz are called:

Discussion

722.	A wire of length L with Young's modulus Y is hanging from a fixed support. The length of wire becomes L1 when mass M1 is suspended, and it becomes L2 when mass M2 is suspended at its free end. Then, the original length L is equal to -
Answer» A wire of length $L$ with Young's modulus $Y$ is hanging from a fixed support. The length of wire becomes $L_{1}$ when mass $M_{1}$ is suspended, and it becomes $L_{2}$ when mass $M_{2}$ is suspended at its free end. Then, the original length $L$ is equal to -

Discussion

723.	कहानी के किस-किस मोड़ पर लुट्टन के जीवन में क्या-क्या परिवर्तन आए?
Answer» कहानी के किस-किस मोड़ पर लुट्टन के जीवन में क्या-क्या परिवर्तन आए?

Discussion

724.	An isolated village uses wind turbines to get electricity for street lights. What will be the energy changes that take place during the process?
Answer» An isolated village uses wind turbines to get electricity for street lights. What will be the energy changes that take place during the process?

Discussion

725.	A body with linear momentum 20kg ms^{-1} is stopped in 10s. The average force required is
Answer» A body with linear momentum 20kg ms^{-1} is stopped in 10s. The average force required is

Discussion

726.	Q. A power of motor is 1500W .How much water per minute can the pump raise to a height of 10m ? (g=10 m/s2)
Answer» Q. A power of motor is 1500W .How much water per minute can the pump raise to a height of 10m ? (g=10 m/s²)

Discussion

727.	Relative density of a body on the surface of Earth is given by R1 and the relative density of the same body on moon is given by R2. Then, the correct relationship between R1 and R2 will be .
Answer» Relative density of a body on the surface of Earth is given by $R_{1}$ and the relative density of the same body on moon is given by $R_{2}$ . Then, the correct relationship between $R_{1}$ and $R_{2}$ will be .

Discussion

728.	The density of ice is x gm/cc and that of water is y gm/cc . What is the change in volume in cc when m gm of ice melts ?
Answer» The density of ice is x gm/cc and that of water is y gm/cc . What is the change in volume in cc when m gm of ice melts ?

Discussion

729.	Explain the conservation of mechanical energy for a free fall body.
Answer» Explain the conservation of mechanical energy for a free fall body.

Discussion

730.	A hollow metal sphere of mass 180.6 g contains a cavity of volume 2.5 cc . This metal when placed in water displaces 24 cc of water . Find the specific gravity of the metal.
Answer» A hollow metal sphere of mass 180.6 g contains a cavity of volume 2.5 cc . This metal when placed in water displaces 24 cc of water . Find the specific gravity of the metal.

Discussion

731.	A motor boat starting from rest on a lake accelerates in a straight line to a constant rate of 3.0 MS-2 for 8.0 years how far does the boat travel during this time
Answer» A motor boat starting from rest on a lake accelerates in a straight line to a constant rate of 3.0 MS-2 for 8.0 years how far does the boat travel during this time

Discussion

732.	Question 21Explain how defects in a metal block can be detected using ultrasound.
Answer» Question 21 Explain how defects in a metal block can be detected using ultrasound.

Discussion

733.	The refractive index of water is
Answer» The refractive index of water is

Discussion

734.	Explain with diagram step-by-step energy conversion ina. Thermal power plantb. Nuclear Power Plant.c. Solar thermal power plantd. Hydroelectric power plant
Answer» Explain with diagram step-by-step energy conversion in a. Thermal power plant b. Nuclear Power Plant. c. Solar thermal power plant d. Hydroelectric power plant

Discussion

735.	ntthe linear mass density d of a rod of length l kepth along x axis varies as d=a+bx , where a and b are positive constants. the centre of mass of the rod is atn
Answer» ntthe linear mass density d of a rod of length l kepth along x axis varies as d=a+bx , where a and b are positive constants. the centre of mass of the rod is atn

Discussion

736.	23. A particle moves with decreasing speed along the circle of radius R so that at any moment of time its tangential and centripetal acceleration are equal in magnitude. At the initial moment,t=0and speed is u. Find the distance travelled by the particle when it's speed becomes 37 of its initial
Answer» 23. A particle moves with decreasing speed along the circle of radius R so that at any moment of time its tangential and centripetal acceleration are equal in magnitude. At the initial moment,t=0and speed is u. Find the distance travelled by the particle when it's speed becomes 37 of its initial

Discussion

737.	Define the term 'Force'.
Answer» Define the term 'Force'.

Discussion

738.	A ball is projected from a certain point on the surface of a planet at a certain angle with the horizontal surface. The horizontal and verticl displacement x and y vary with time t in second as : x = 10\sqrt3 t and y= 10t -t ^2 . The maximum height attained by the ball is : (a) 100 m (b) 75 m (c) 50 m (d) 25 m .
Answer» A ball is projected from a certain point on the surface of a planet at a certain angle with the horizontal surface. The horizontal and verticl displacement x and y vary with time t in second as : x = 10\sqrt3 t and y= 10t -t ^2 . The maximum height attained by the ball is : (a) 100 m (b) 75 m (c) 50 m (d) 25 m .

Discussion

739.	Choose the correct option regarding gravitational force.
Answer» Choose the correct option regarding gravitational force.

Discussion

740.	The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
Answer» The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Discussion

741.	Question 2A train is travelling at a speed of 90 kmph. Brakes are applied so as to produce a uniform acceleration of −0.5 ms−2. Find how far the train will go before it is brought to rest.
Answer» Question 2 A train is travelling at a speed of $90 k m p h$ . Brakes are applied so as to produce a uniform acceleration of $- 0.5 m s^{- 2}$ . Find how far the train will go before it is brought to rest.

Discussion

742.	A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field →E. Due to the force q→E, its velocity increases from 0 m/s to 6 m/s in one second. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
Answer» A toy car with charge $q$ moves on a frictionless horizontal plane surface under the influence of a uniform electric field $\to E$ . Due to the force $q$ $\to E$ , its velocity increases from $0 m / s$ to $6 m / s$ in one second. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between $0$ to $3$ seconds are respectively

Discussion

743.	A train slows down on applying brakes. Which of the following depicts the energy transformation that takes place?
Answer» A train slows down on applying brakes. Which of the following depicts the energy transformation that takes place?

Discussion

744.	From a rifle of mass 4kg, a bullet of mass 5kg is fired with a initial velocity of 20m/s.Calculating initial velocity of the rifle?
Answer» From a rifle of mass 4kg, a bullet of mass 5kg is fired with a initial velocity of 20m/s.Calculating initial velocity of the rifle?

Discussion

745.	A book is kept on the table top and is at rest. The force which acts on the book is
Answer» A book is kept on the table top and is at rest. The force which acts on the book is

Discussion

746.	A car of mass 500 kg is accelerating at 2 ms−2. What is the net force acting on the car?
Answer» A car of mass $500 k g$ is accelerating at $2 m s^{- 2}$ . What is the net force acting on the car?

Discussion

747.	What is equilibrium of a body on a rough inclined plane?Topic:friction
Answer» What is equilibrium of a body on a rough inclined plane? Topic:friction

Discussion

748.	does the property of magnetic field lines moving from north to south pole and south to north pole hold true for a horse shoe magnet? if so then how
Answer» does the property of magnetic field lines moving from north to south pole and south to north pole hold true for a horse shoe magnet? if so then how

Discussion

749.	7. A vessel containing water is given a constant acceleration a towards the right, along a straight horizontal path. Which of the following diagram represent the surface of the liquid
Answer» 7. A vessel containing water is given a constant acceleration a towards the right, along a straight horizontal path. Which of the following diagram represent the surface of the liquid

Discussion

750.	A wave is moving in air with a velocity of 340 m/s. Calculate the wavelength if its frequency is 512 vibrations / sec.
Answer» A wave is moving in air with a velocity of 340 m/s. Calculate the wavelength if its frequency is 512 vibrations / sec.

Discussion

Explore topic-wise InterviewSolutions in .

write any two difference between Audible &amp; ultrasonic sound

A piece of aluminum of volume 200 cm3 and density 2.7g/cm3 is completely immersed in kerosene. Determine the up thrust exerted on the piece of aluminum and also determine how much it will in kerosene. Explain the steps with reasons.

An object moves with a uniform velocity when the net force acting on it is_______.

A body of mass 10kg is hanging from another body of mass 15kg. The combination is pulled up by a string with an acceleration of . 1.2m−2 Find the tensions (in N) at A and B points as shown in figure (Take g=9.8m/s2).

A wavefront AB is refracted from medium 1 to medium 2. The refractive index of medium 2 is less than that of medium 1. Which of the following wavefronts in medium 2, show the refracted wavefront?

A solid weighs 100 gf (gram force) in air and 90 gf (gram force) when completely immersed in water. Calculate the volume of the solid.

Show the derivation of the formula - Velocity of the sound =sqrt(aP/D). Whereas a the specific heat P is the pressure. D is the density or molecular inertia.

what is buoyancy and buoyant force ?

If momentum of an object is increased by 10% then it's kinetic energy will increase by

Gravitational force does not depend on:

Name the physical quantity obtained by dividing 'Distance travelled' by 'Time taken' to travel that distance.

97. A projectile is projected at an angle of 45 degree with the horizontal with a speed of 15 under root 2 m/s,from the top of height 50m .Find the horizontal displacement of the particle till it reaches the ground.(take g=10m/s2)

A train moving at a constant speed of 54kmph moves eastwards for 30min then north for 40min find avg velocity

A boy of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s.Calculate : 1-the force of gravity acting on the boy 2-the work done by him against the gravity 3-the power sent by the boy (take g=10m 1/s²)

90. If U= 6xcube-48x the. What will be the expression for (1) Force (2) Stable &unstable equilibrium (3) potential energy in these position

A wooden block of mass 60 kg and dimensions 30 cm×40 cm×50 cm is kept on horizontal floor. If P1 is the maximum pressure exerted on the floor by the block and P2 is the minimum pressure exerted on the floor by the block, then

A bar magnet is kept parallel to the earth’s magnetic field then number of neutral points obtained in the horizontal plane containing the bar magnet isOptions:Infinite1 24

Is the density of all elements and compounds (substances) different? Are there any elements or compounds which have same density.

The value of gravitational potential energy at the reference level would be.

Sound waves with frequency smaller than 20 Hz are called:

A wire of length L with Young's modulus Y is hanging from a fixed support. The length of wire becomes L1 when mass M1 is suspended, and it becomes L2 when mass M2 is suspended at its free end. Then, the original length L is equal to -

कहानी के किस-किस मोड़ पर लुट्टन के जीवन में क्या-क्या परिवर्तन आए?

An isolated village uses wind turbines to get electricity for street lights. What will be the energy changes that take place during the process?

A body with linear momentum 20kg ms^{-1} is stopped in 10s. The average force required is

Q. A power of motor is 1500W .How much water per minute can the pump raise to a height of 10m ? (g=10 m/s​​​​​​2)

Relative density of a body on the surface of Earth is given by R1 and the relative density of the same body on moon is given by R2. Then, the correct relationship between R1 and R2 will be .

The density of ice is x gm/cc and that of water is y gm/cc . What is the change in volume in cc when m gm of ice melts ?

Explain the conservation of mechanical energy for a free fall body.

A hollow metal sphere of mass 180.6 g contains a cavity of volume 2.5 cc . This metal when placed in water displaces 24 cc of water . Find the specific gravity of the metal.

A motor boat starting from rest on a lake accelerates in a straight line to a constant rate of 3.0 MS-2 for 8.0 years how far does the boat travel during this time

Question 21Explain how defects in a metal block can be detected using ultrasound.

The refractive index of water is

Explain with diagram step-by-step energy conversion ina. Thermal power plantb. Nuclear Power Plant.c. Solar thermal power plantd. Hydroelectric power plant

ntthe linear mass density d of a rod of length l kepth along x axis varies as d=a+bx , where a and b are positive constants. the centre of mass of the rod is atn

23. A particle moves with decreasing speed along the circle of radius R so that at any moment of time its tangential and centripetal acceleration are equal in magnitude. At the initial moment,t=0and speed is u. Find the distance travelled by the particle when it's speed becomes 37 of its initial

Define the term 'Force'.

Choose the correct option regarding gravitational force.

The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Question 2A train is travelling at a speed of 90 kmph. Brakes are applied so as to produce a uniform acceleration of −0.5 ms−2. Find how far the train will go before it is brought to rest.

A train slows down on applying brakes. Which of the following depicts the energy transformation that takes place?

From a rifle of mass 4kg, a bullet of mass 5kg is fired with a initial velocity of 20m/s.Calculating initial velocity of the rifle?

A book is kept on the table top and is at rest. The force which acts on the book is

A car of mass 500 kg is accelerating at 2 ms−2. What is the net force acting on the car?

What is equilibrium of a body on a rough inclined plane?Topic:friction

does the property of magnetic field lines moving from north to south pole and south to north pole hold true for a horse shoe magnet? if so then how

7. A vessel containing water is given a constant acceleration a towards the right, along a straight horizontal path. Which of the following diagram represent the surface of the liquid

A wave is moving in air with a velocity of 340 m/s. Calculate the wavelength if its frequency is 512 vibrations / sec.

write any two difference between Audible & ultrasonic sound

Q. A power of motor is 1500W .How much water per minute can the pump raise to a height of 10m ? (g=10 m/s2)