6277 + Interview Questions in Physics Page 60 InterviewSolution

2951.	Which terminal of a cell is at higher potential–positive or negative? How does this affect the direction of flow of electric current?
Answer» Which terminal of a cell is at higher potential–positive or negative? How does this affect the direction of flow of electric current?

Discussion

2952.	What is the difference between a tornado and a cyclone?
Answer» What is the difference between a tornado and a cyclone?

Discussion

2953.	If we take regular data readings at small time intervals, what type of graph is most suitable?
Answer» If we take regular data readings at small time intervals, what type of graph is most suitable?

Discussion

2954.	The area of cross section of a large tank is 0.5 m2. It has an opening near the bottom having area of cross section 1 cm2. A load of 20 kg is applied on the water at the top. Find the velocity of the water coming out of the opening at the time when the height of water level is 50 cm above the bottom. Take g = 10 m s-2.
Answer» The area of cross section of a large tank is 0.5 m². It has an opening near the bottom having area of cross section 1 cm². A load of 20 kg is applied on the water at the top. Find the velocity of the water coming out of the opening at the time when the height of water level is 50 cm above the bottom. Take g = 10 m s^-2.

Discussion

2955.	While connecting a bulb to a battery, one of the terminals of the battery was left disconnected. Pick the correct statement.
Answer» While connecting a bulb to a battery, one of the terminals of the battery was left disconnected. Pick the correct statement.

Discussion

2956.	When electron clouds overlap, do they stop revolving around the nucleus?
Answer» When electron clouds overlap, do they stop revolving around the nucleus?

Discussion

2957.	In a closed electric circuit:
Answer» In a closed electric circuit:

Discussion

2958.	Wind blows due to
Answer» Wind blows due to

Discussion

2959.	2 point charges 10microC and -10microC are placed 5mm apart. Determine the electric field ata) A point P on the axis of the dipole 15cm away from its center O on the side of the positive charge
Answer» 2 point charges 10microC and -10microC are placed 5mm apart. Determine the electric field at a) A point P on the axis of the dipole 15cm away from its center O on the side of the positive charge

Discussion

2960.	A 263-g block is dropped onto a vertical spring with force constant k = 2.52N/cm. The block sticks to the spring, and the spring compress 11.8 cm before coming momentarily to rest. while the spring is being compressed, how much work is done (a) by the force of gravity and (b) by the spring? (c) What was the speed of the block just before it hit the spring? Ignore friction.
Answer» A 263-g block is dropped onto a vertical spring with force constant k = 2.52N/cm. The block sticks to the spring, and the spring compress 11.8 cm before coming momentarily to rest. while the spring is being compressed, how much work is done (a) by the force of gravity and (b) by the spring? (c) What was the speed of the block just before it hit the spring? Ignore friction.

Discussion

2961.	What is the path followed by a moving body, on whicha constant force acts in a direction other than initialvelocity (i.e. excluding parallel and antiparalleldirection)?(1) Straight line(2) Parabolic(3) Circular(4) Elliptical
Answer» What is the path followed by a moving body, on whicha constant force acts in a direction other than initialvelocity (i.e. excluding parallel and antiparalleldirection)?(1) Straight line(2) Parabolic(3) Circular(4) Elliptical

Discussion

2962.	Name the physical quantity obtained by dividing 'Dividing travelled' by `Time taken' to travel that distance.
Answer» Name the physical quantity obtained by dividing 'Dividing travelled' by `Time taken' to travel that distance.

Discussion

2963.	A concave mirror is used to form a real image of a candel. If the upper half of the mirror is covered by a piece of paper what will happen to the immage? Will it become dimmer or remain same? Why?
Answer» A concave mirror is used to form a real image of a candel. If the upper half of the mirror is covered by a piece of paper what will happen to the immage? Will it become dimmer or remain same? Why?

Discussion

2964.	As the angle between two plane mirrors decreases, the number of images increases. Do you agree? If the angle is given, how will you find the number of images without performing an experiment?
Answer» As the angle between two plane mirrors decreases, the number of images increases. Do you agree? If the angle is given, how will you find the number of images without performing an experiment?

Discussion

2965.	A bus decreases its speed from 80 km/hr to 60 km/hr on a straight road in 5 sec. Find the magnitude of acceleration of the bus.
Answer» A bus decreases its speed from $80 k m / h r$ to $60 k m / h r$ on a straight road in $5 s e c$ . Find the magnitude of acceleration of the bus.

Discussion

2966.	Which of the following velocity-time graph is showing motion of a particle with negative acceleration?निम्न में से कौनसा वेग-समय आरेख ऋणात्मक त्वरण से एक कण की गति को दर्शाता है?
Answer» Which of the following velocity-time graph is showing motion of a particle with negative acceleration? निम्न में से कौनसा वेग-समय आरेख ऋणात्मक त्वरण से एक कण की गति को दर्शाता है?

Discussion

2967.	If we are heating a sublimable substance then does its temperature remains constant?
Answer» If we are heating a sublimable substance then does its temperature remains constant?

Discussion

2968.	Q:- If 50 joule of work must be done to move an electric charge of 2 C from a point, where potential is -10V to another point where potential is V volt. Then, the value of V is 1. 5V 2. +15
Answer» Q:- If 50 joule of work must be done to move an electric charge of 2 C from a point, where potential is -10V to another point where potential is V volt. Then, the value of V is 1. 5V 2. +15

Discussion

2969.	1. the mean free path of molecules of a gas, is inversely proportional to? 2.during an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. the ratio of cp/cv for the gas?
Answer» 1. the mean free path of molecules of a gas, is inversely proportional to? 2.during an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. the ratio of cp/cv for the gas?

Discussion

2970.	Speed of a bus increases from 36km/h to 72km/h in 20 seconds. It's acceleration is:
Answer» Speed of a bus increases from 36km/h to 72km/h in 20 seconds. It's acceleration is:

Discussion

2971.	When do we call an atom as neutral?
Answer» When do we call an atom as neutral?

Discussion

2972.	A thick glass tumbler cracks when hot water is poured in it. Why?
Answer» A thick glass tumbler cracks when hot water is poured in it. Why?

Discussion

2973.	What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch the surface of the water in a beaker, the water gets splashed?
Answer» What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch the surface of the water in a beaker, the water gets splashed?

Discussion

2974.	Find the temperature at which methane and ethane will have the same rms speed as carbon dioxide at 400∘C.Also calculate the mean velocity and velocity of methane molecules at 400∘C.
Answer» Find the temperature at which methane and ethane will have the same rms speed as carbon dioxide at $400^{\circ} C$ .Also calculate the mean velocity and velocity of methane molecules at $400^{\circ} C$ .

Discussion

2975.	17. Electric charge q ,q and -2q are pectively placed at the side of a n equilateral triangle of side a. Magnitude of the electric dipole moment of the system is
Answer» 17. Electric charge q ,q and -2q are pectively placed at the side of a n equilateral triangle of side a. Magnitude of the electric dipole moment of the system is

Discussion

2976.	Select a chemical change from the given examples.
Answer» Select a chemical change from the given examples.

Discussion

2977.	Which of the following phenomenon is caused by difference in the rate of refraction?
Answer» Which of the following phenomenon is caused by difference in the rate of refraction?

Discussion

2978.	While reading a thermometer, we should not hold it by the:
Answer» While reading a thermometer, we should not hold it by the:

Discussion

2979.

Match the following: (A) Plane mirror (1) Always virtual, erect and dimnished image (B) Convex mirror (2) Image is erect and of the same size as the object (C) Convex lens (3) Used by dentists to see enlarged images of teeth (D) Concave mirror (4) Used in microscope.

Answer» Match the following:

(A) Plane mirror	(1) Always virtual, erect and dimnished image
(B) Convex mirror	(2) Image is erect and of the same size as the object
(C) Convex lens	(3) Used by dentists to see enlarged images of teeth
(D) Concave mirror	(4) Used in microscope.

Discussion

2980.	20. A boy is standing on a horizontal massless rotating wheel with his hands stretched. Kinetic energy of boy is120 J. If he now folded his hands then M.I is reduced to 80%. Then a new K.E. of boy,(1) Increases by 30 J(2) Decreases by 30 J(3) Increases by 20 J(4) Remains constant
Answer» 20. A boy is standing on a horizontal massless rotating wheel with his hands stretched. Kinetic energy of boy is 120 J. If he now folded his hands then M.I is reduced to 80%. Then a new K.E. of boy, (1) Increases by 30 J (2) Decreases by 30 J (3) Increases by 20 J (4) Remains constant

Discussion

2981.	A concave mirror of radius of curvature 20 cm forms a image of the sun. The diameter of the sun subtends an angle 1 degree on the earth. Then the diameter of the image is (in cm)(a) 2pi/9 (b) pi/9 (c) 20 (d) pi/18
Answer» A concave mirror of radius of curvature 20 cm forms a image of the sun. The diameter of the sun subtends an angle 1 degree on the earth. Then the diameter of the image is (in cm) (a) 2pi/9 (b) pi/9 (c) 20 (d) pi/18

Discussion

2982.	A straight wire of length L carrying a current / isturned into a square loop of side a. The magnitudeof its magnetic moment will be
Answer» A straight wire of length L carrying a current / isturned into a square loop of side a. The magnitudeof its magnetic moment will be

Discussion

2983.	In a circular motion, the direction of velocity at any point is along the __ to the circle.
Answer» In a circular motion, the direction of velocity at any point is along the __ to the circle.

Discussion

2984.	Vijay is pushing a block with 22 N force and Gopal is pushing it with 10 N force in the opposite direction. The block moves a distance of 6.5 m in the same direction in which Vijay is pushing it. The work done on the block is:
Answer» Vijay is pushing a block with $22 N$ force and Gopal is pushing it with $10 N$ force in the opposite direction. The block moves a distance of $6.5 m$ in the same direction in which Vijay is pushing it. The work done on the block is:

Discussion

2985.	A car is moving on a straight line at a speed of 50 km/h and a truck is ahead of a car and having the large plane mirror fixed vertically on the back of truck. Truck is running at a speed of 70 km/h. For a stationary observer s†an ding between car and truck. What is the speed of image of car in the mirror? (1) 40 km/h (2) 70 km/h (3) 20 km/h (4) 90 km/h
Answer» A car is moving on a straight line at a speed of 50 km/h and a truck is ahead of a car and having the large plane mirror fixed vertically on the back of truck. Truck is running at a speed of 70 km/h. For a stationary observer s†an ding between car and truck. What is the speed of image of car in the mirror? (1) 40 km/h (2) 70 km/h (3) 20 km/h (4) 90 km/h

Discussion

2986.	If the velocity-time graph is some straight line in a plane passing through origin, then definitely
Answer» If the velocity-time graph is some straight line in a plane passing through origin, then definitely

Discussion

2987.	A car is moving at a constant speed covers a distance of 120 km in 2 hours. Find the time taken by the car to cover a distance of Rs 540 km at the same speed.
Answer» A car is moving at a constant speed covers a distance of 120 km in 2 hours. Find the time taken by the car to cover a distance of Rs 540 km at the same speed.

Discussion

2988.	an object weighs 600N on the earth . Find its weight on the moon and the mass on earth and mass on moon
Answer» an object weighs 600N on the earth . Find its weight on the moon and the mass on earth and mass on moon

Discussion

2989.	Size of shadow depends on
Answer» Size of shadow depends on

Discussion

2990.	ntA stationary hydrogen atom of mass M emits a photon corresponding to the second line of Lyman series. If R is Rydberg constant, what is the velocity acquired by the atom?n
Answer» ntA stationary hydrogen atom of mass M emits a photon corresponding to the second line of Lyman series. If R is Rydberg constant, what is the velocity acquired by the atom?n

Discussion

2991.	A compressible sponge is taken from 1 metre depth to 2 metre depth inside a swimming pool. Then its volume _______.
Answer» A compressible sponge is taken from 1 metre depth to 2 metre depth inside a swimming pool. Then its volume _______.

Discussion

2992.	the K.E. of a satellite is 2mj what is the total energy of the satellite?
Answer» the K.E. of a satellite is 2mj what is the total energy of the satellite?

Discussion

2993.	A cylinder of radius R made of material of thermal conductivity K1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2 . the 2 ends of the combined system are maintained at 2 different tamperatures . there is no loss of heat across the cylindrical surface and the system is in steady state. the effective thermal conductivity of the system is 1 \lbrack K1+K2\rbrack 2 \lbrack K1+3K2\rbrack/4 3 K1K2/ K1+K2 4 \lbrack3K1+K2\rbrack/4
Answer» A cylinder of radius R made of material of thermal conductivity K1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2 . the 2 ends of the combined system are maintained at 2 different tamperatures . there is no loss of heat across the cylindrical surface and the system is in steady state. the effective thermal conductivity of the system is 1 \lbrack K1+K2\rbrack 2 \lbrack K1+3K2\rbrack/4 3 K1K2/ K1+K2 4 \lbrack3K1+K2\rbrack/4

Discussion

2994.	Out of the following which mirror is used in solar furnace
Answer» Out of the following which mirror is used in solar furnace

Discussion

2995.	A magnetic compass is placed a significant distance from a bar magnet. The compass experiences no deflection even though a magnet is kept around it. What could the reason be?
Answer» A magnetic compass is placed a significant distance from a bar magnet. The compass experiences no deflection even though a magnet is kept around it. What could the reason be?

Discussion

2996.	A pendulum has a time period of 1.5 s. So, it takes to complete 7 oscillations.
Answer» A pendulum has a time period of 1.5 s. So, it takes to complete 7 oscillations.

Discussion

2997.	You can make a copper wire but not a coal wire. It is because:
Answer» You can make a copper wire but not a coal wire. It is because:

Discussion

2998.	Two separate wires A and B are stretched by 2 mm and 4 mm respectively, when they are subjected to a force of 2 N. Assume that both the wires are made up of same material and the radius of wire B is 4 times that of the radius of wire A. The length of the wires A and B are in the ratio of a:b; Then ab can be expressed as 1x where x is.
Answer» Two separate wires $A$ and $B$ are stretched by $2$ $mm$ and $4$ $mm$ respectively, when they are subjected to a force of $2$ $N$ . Assume that both the wires are made up of same material and the radius of wire $B$ is $4$ times that of the radius of wire $A$ . The length of the wires $A$ and $B$ are in the ratio of $a : b$ ; Then $\frac{a}{b}$ can be expressed as $\frac{1}{x}$ where $x$ is.

Discussion

2999.	The most central and darkest part of a shadow is called an
Answer» The most central and darkest part of a shadow is called an

Discussion

3000.	An electric cable contains a single copper wire of radius 9 mm. It’s resistance is 5Ω. This cable is replaced by six insulated copper wires connected in parallel, each of radius 3 mm. The resultant resistance of cable will be
Answer» An electric cable contains a single copper wire of radius 9 mm. It’s resistance is $5 Ω$ . This cable is replaced by six insulated copper wires connected in parallel, each of radius 3 mm. The resultant resistance of cable will be

Discussion

Explore topic-wise InterviewSolutions in .

Which terminal of a cell is at higher potential–positive or negative? How does this affect the direction of flow of electric current?

What is the difference between a tornado and a cyclone?

If we take regular data readings at small time intervals, what type of graph is most suitable?

While connecting a bulb to a battery, one of the terminals of the battery was left disconnected. Pick the correct statement.

When electron clouds overlap, do they stop revolving around the nucleus?

In a closed electric circuit:

Wind blows due to

2 point charges 10microC and -10microC are placed 5mm apart. Determine the electric field ata) A point P on the axis of the dipole 15cm away from its center O on the side of the positive charge

What is the path followed by a moving body, on whicha constant force acts in a direction other than initialvelocity (i.e. excluding parallel and antiparalleldirection)?(1) Straight line(2) Parabolic(3) Circular(4) Elliptical

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

A concave mirror is used to form a real image of a candel. If the upper half of the mirror is covered by a piece of paper what will happen to the immage? Will it become dimmer or remain same? Why?

As the angle between two plane mirrors decreases, the number of images increases. Do you agree? If the angle is given, how will you find the number of images without performing an experiment?

A bus decreases its speed from 80 km/hr to 60 km/hr on a straight road in 5 sec. Find the magnitude of acceleration of the bus.

Which of the following velocity-time graph is showing motion of a particle with negative acceleration?निम्न में से कौनसा वेग-समय आरेख ऋणात्मक त्वरण से एक कण की गति को दर्शाता है?

If we are heating a sublimable substance then does its temperature remains constant?

Q:- If 50 joule of work must be done to move an electric charge of 2 C from a point, where potential is -10V to another point where potential is V volt. Then, the value of V is 1. 5V 2. +15

1. the mean free path of molecules of a gas, is inversely proportional to? 2.during an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. the ratio of cp/cv for the gas?

Speed of a bus increases from 36km/h to 72km/h in 20 seconds. It's acceleration is:

When do we call an atom as neutral?

A thick glass tumbler cracks when hot water is poured in it. Why?

What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch the surface of the water in a beaker, the water gets splashed?

Find the temperature at which methane and ethane will have the same rms speed as carbon dioxide at 400∘C.Also calculate the mean velocity and velocity of methane molecules at 400∘C.

17. Electric charge q ,q and -2q are pectively placed at the side of a n equilateral triangle of side a. Magnitude of the electric dipole moment of the system is

Select a chemical change from the given examples.

Which of the following phenomenon is caused by difference in the rate of refraction?

While reading a thermometer, we should not hold it by the:

Match the following: (A) Plane mirror (1) Always virtual, erect and dimnished image (B) Convex mirror (2) Image is erect and of the same size as the object (C) Convex lens (3) Used by dentists to see enlarged images of teeth (D) Concave mirror (4) Used in microscope.

20. A boy is standing on a horizontal massless rotating wheel with his hands stretched. Kinetic energy of boy is120 J. If he now folded his hands then M.I is reduced to 80%. Then a new K.E. of boy,(1) Increases by 30 J(2) Decreases by 30 J(3) Increases by 20 J(4) Remains constant

A concave mirror of radius of curvature 20 cm forms a image of the sun. The diameter of the sun subtends an angle 1 degree on the earth. Then the diameter of the image is (in cm)(a) 2pi/9 (b) pi/9 (c) 20 (d) pi/18

A straight wire of length L carrying a current / isturned into a square loop of side a. The magnitudeof its magnetic moment will be

In a circular motion, the direction of velocity at any point is along the __ to the circle.

Vijay is pushing a block with 22 N force and Gopal is pushing it with 10 N force in the opposite direction. The block moves a distance of 6.5 m in the same direction in which Vijay is pushing it. The work done on the block is:

If the velocity-time graph is some straight line in a plane passing through origin, then definitely

A car is moving at a constant speed covers a distance of 120 km in 2 hours. Find the time taken by the car to cover a distance of Rs 540 km at the same speed.

an object weighs 600N on the earth . Find its weight on the moon and the mass on earth and mass on moon

Size of shadow depends on

ntA stationary hydrogen atom of mass M emits a photon corresponding to the second line of Lyman series. If R is Rydberg constant, what is the velocity acquired by the atom?n

A compressible sponge is taken from 1 metre depth to 2 metre depth inside a swimming pool. Then its volume _______.

the K.E. of a satellite is 2mj what is the total energy of the satellite?

Out of the following which mirror is used in solar furnace

A magnetic compass is placed a significant distance from a bar magnet. The compass experiences no deflection even though a magnet is kept around it. What could the reason be?

A pendulum has a time period of 1.5 s. So, it takes to complete 7 oscillations.

You can make a copper wire but not a coal wire. It is because:

The most central and darkest part of a shadow is called an

An electric cable contains a single copper wire of radius 9 mm. It’s resistance is 5Ω. This cable is replaced by six insulated copper wires connected in parallel, each of radius 3 mm. The resultant resistance of cable will be