50278 + Interview Questions in Physics

1.	A body starts from rest with a uniform acceleration. If its velocity after n second is v, then its displacement in the last 2 s is
Answer» A body starts from rest with a uniform acceleration. If its velocity after $n$ second is $v$ , then its displacement in the last $2 s$ is

Discussion

2.	A particle is performing a linear simple harmonic motion. If the acceleration and the corresponding velocity of the particle are a and v respectively, which of the following graphs is correct?
Answer» A particle is performing a linear simple harmonic motion. If the acceleration and the corresponding velocity of the particle are a and v respectively, which of the following graphs is correct?

Discussion

3.	To maintain a rotor at a uniform angular speed of 200 rads−1, an engine needs to transmit a torque of 180 Nm. What is the power required by the engine? (Note: uniform angular velocity in the absence of friction implies zero torque. In practice, applied torque is needed to counter frictional torque). Assume that the engine is 100 % efficient.
Answer» To maintain a rotor at a uniform angular speed of $200 r a d s^{- 1}$ , an engine needs to transmit a torque of 180 Nm. What is the power required by the engine? (Note: uniform angular velocity in the absence of friction implies zero torque. In practice, applied torque is needed to counter frictional torque). Assume that the engine is 100 % efficient.

Discussion

4.	Three students measure the length of a rod and reports 13.59 m, 0.01359 km and 1359 cm respectively. Then the difference between the maximum and minimum number of significant figures for the given data is
Answer» Three students measure the length of a rod and reports 13.59 m, 0.01359 km and 1359 cm respectively. Then the difference between the maximum and minimum number of significant figures for the given data is

Discussion

5.	Calculate the parallax of a star (in sec) at the distance of 4.29 light years when viewed from two locations of earth six months apart in its orbit around the sun. Answer upto 2 places of decimal ( Assume diameter of earths orbit around sun to be 3×1011 m)
Answer» Calculate the parallax of a star (in $sec$ ) at the distance of $4.29$ light years when viewed from two locations of earth six months apart in its orbit around the sun. Answer upto 2 places of decimal ( Assume diameter of earths orbit around sun to be $3 \times 10^{11} m$ )

Discussion

6.	Terminal velocity of Mars rover depends upon P = gas density of atmosphere of mars A = frontal area W = weight of falling object What may be the possible relation between terminal velocity v and given quantity.
Answer» Terminal velocity of Mars rover depends upon P = gas density of atmosphere of mars A = frontal area W = weight of falling object What may be the possible relation between terminal velocity $v$ and given quantity.

Discussion

7.	A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by 1 m/s so as to have same K.E. as that of boy. The original speed of the man will be
Answer» A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by 1 m/s so as to have same K.E. as that of boy. The original speed of the man will be

Discussion

8.	Point charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of net electric dipole moment of the system is
Answer» Point charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of net electric dipole moment of the system is

Discussion

9.	Figure shows three circuits with identical batteries, inductor and resistors. Rank the circuits in the decreasing order of the current through the battery just after the switch is closed
Answer» Figure shows three circuits with identical batteries, inductor and resistors. Rank the circuits in the decreasing order of the current through the battery just after the switch is closed

Discussion

10.	Convert π6, 5π radians to degrees
Answer» Convert $\frac{π}{6}$ , $5 π$ radians to degrees

Discussion

11.	A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the internal energy?
Answer» A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the internal energy?

Discussion

12.	Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature by definite fraction of its volume at
Answer» Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature by definite fraction of its volume at

Discussion

13.	The voltmeter shown in figure (32-E25) reads 18 V across the 50 Ω resistor. Find the resistance of the voltmeter. figure (32-E25)
Answer» The voltmeter shown in figure (32-E25) reads 18 V across the 50 $Ω$ resistor. Find the resistance of the voltmeter. figure (32-E25)

13.

The voltmeter shown in figure (32-E25) reads 18 V across the 50 Ω resistor. Find the resistance of the voltmeter. figure (32-E25)

Answer»

The voltmeter shown in figure (32-E25) reads 18 V across the 50 $Ω$ resistor. Find the resistance of the voltmeter.

figure (32-E25)

Discussion

14.	A box containing a resistance R, inductance L and a capacitor of capacitance C is connected in series to an alternating source of angular frequency 4 rad/s and a capacitor of capacitance C as shown in the circuit. Box has power factor of 1√3 and the circuit has overall power factor of 1. The impedance of the box is
Answer» A box containing a resistance $R$ , inductance $L$ and a capacitor of capacitance $C$ is connected in series to an alternating source of angular frequency $4 r a d / s$ and a capacitor of capacitance $C$ as shown in the circuit. Box has power factor of $\frac{1}{\sqrt{3}}$ and the circuit has overall power factor of $1$ . The impedance of the box is

Discussion

15.	In a double slit experiment when light of wavelength 400 nm was used the angular width of the first minima formed on a screen placed 1 m away was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μwater = 4/3)
Answer» In a double slit experiment when light of wavelength $400 n m$ was used the angular width of the first minima formed on a screen placed $1 m$ away was found to be $0.2 °$ . What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? ( $μ_{w a t e r}$ = 4/3)

Discussion

16.	What will be work done in supplying 400 calories of heat to a system?
Answer» What will be work done in supplying $400 calories$ of heat to a system?

Discussion

17.	Find the equivalent capacitance of the infinite ladder shown in figure (31-E17) between the points. A and B.
Answer» Find the equivalent capacitance of the infinite ladder shown in figure (31-E17) between the points. A and B.

17.

Find the equivalent capacitance of the infinite ladder shown in figure (31-E17) between the points. A and B.

Answer»

Find the equivalent capacitance of the infinite ladder shown in figure (31-E17) between the points. A and B.

Discussion

18.	A ball is projected with an initial speed u at an angle θ from the horizontal ground. The coefficient of restitution between the ball and the ground is e. Find the position from the starting point when the ball will land on the ground for the 2nd time.
Answer» A ball is projected with an initial speed $u$ at an angle $θ$ from the horizontal ground. The coefficient of restitution between the ball and the ground is $e$ . Find the position from the starting point when the ball will land on the ground for the $2^{n d}$ time.

Discussion

19.	A car moving at 40 km/h is to be stopped by applying brakes in the next 4.0 m. If the car weighs 2000 kg, what average force must be applied on it ?
Answer» A car moving at 40 km/h is to be stopped by applying brakes in the next 4.0 m. If the car weighs 2000 kg, what average force must be applied on it ?

Discussion

20.	You have been given a box filled with two gases - oxygen, and an unknown gas. It is seen that at any temperature of the mixture, the rms speed of the unknown gas is always four times that of oxygen. Can you identify this gas?
Answer» You have been given a box filled with two gases - oxygen, and an unknown gas. It is seen that at any temperature of the mixture, the rms speed of the unknown gas is always four times that of oxygen. Can you identify this gas?

Discussion

21.	A projectile is given an initial velocity of
Answer» A projectile is given an initial velocity of

Discussion

22.	A body of mass m kg starts falling from a point 2R above the earth's surface. Its kinetic energy when it has fallen to a point 'R' above the earth's surface [R-Radius of earth]
Answer» A body of mass m kg starts falling from a point 2R above the earth's surface. Its kinetic energy when it has fallen to a point 'R' above the earth's surface [R-Radius of earth]

Discussion

23.	Two blocks of masses m1 n m2 connected by a massless spring of spring constant k rest on a smooth horizontal plane . block 2 is shifted a small distance x to the left and then released . find the velocity of com of the system after block breaks off the wall.
Answer» Two blocks of masses m1 n m2 connected by a massless spring of spring constant k rest on a smooth horizontal plane . block 2 is shifted a small distance x to the left and then released . find the velocity of com of the system after block breaks off the wall.

Discussion

24.	If the horizontal force needed for the turn in the previous problem is to be supplied by the normal force by the road, what should be the proper angle of banking ?
Answer» If the horizontal force needed for the turn in the previous problem is to be supplied by the normal force by the road, what should be the proper angle of banking ?

Discussion

25.	An aeroplane is flying horizontally with a velocity of 600 km/h at a height of 1960 m. When it is vertically above a point A (point A on the ground), a bomb is released from it. The bomb strikes the ground at point B. The horizontal distance AB is
Answer» An aeroplane is flying horizontally with a velocity of 600 km/h at a height of 1960 m. When it is vertically above a point A (point A on the ground), a bomb is released from it. The bomb strikes the ground at point B. The horizontal distance AB is

25.

An aeroplane is flying horizontally with a velocity of 600 km/h at a height of 1960 m. When it is vertically above a point A (point A on the ground), a bomb is released from it. The bomb strikes the ground at point B. The horizontal distance AB is

Answer»

An aeroplane is flying horizontally with a velocity of 600 km/h at a height of 1960 m. When it is vertically above a point A (point A on the ground), a bomb is released from it. The bomb strikes the ground at point B. The horizontal distance AB is

Discussion

26.	In the given figure, what maximum force F can be applied on wedge of mass M, so that block of mass m does not move with respect to wedge.
Answer» In the given figure, what maximum force F can be applied on wedge of mass M, so that block of mass m does not move with respect to wedge.

Discussion

27.	Which one of the following statements is wrong for gases
Answer» Which one of the following statements is wrong for gases

Discussion

28.	On a rough horizontal floor four objects are rolling without slipping. They are i) a solid sphere ii) a hollow spherical shell iii) a solid cylinder iv) a hollow cylinder. If all of them have the same mass and linear velocity for their centres of mass, which object has more kinetic energy?
Answer» On a rough horizontal floor four objects are rolling without slipping. They are i) a solid sphere ii) a hollow spherical shell iii) a solid cylinder iv) a hollow cylinder. If all of them have the same mass and linear velocity for their centres of mass, which object has more kinetic energy?

Discussion

29.	From the foot of a tower 90 m high, a stone is thrown up so as to reach the top of the tower with zero velocity. Two seconds later another stone is dropped from the top of the tower. Find when will two stones meet for the first time ?
Answer» From the foot of a tower $90 m$ high, a stone is thrown up so as to reach the top of the tower with zero velocity. Two seconds later another stone is dropped from the top of the tower. Find when will two stones meet for the first time ?

Discussion

30.	In each of the following questions, some conclusions marked 1, 2, and so on are drawn from the given statements. Select the answer choice that presents only correct conclusions. Q14. Statements: i. Some headphones are earphones. ii. All earphones are telephones. iii. No telephones are TVs. Conclusions: 1. No earphones are TVs. 2. Some headphones are not TVs. 3. Some headphones are telephones. 4. Some telephones are not TVs. Select the correct code:
Answer» In each of the following questions, some conclusions marked 1, 2, and so on are drawn from the given statements. Select the answer choice that presents only correct conclusions. Q14. Statements: i. Some headphones are earphones. ii. All earphones are telephones. iii. No telephones are TVs. Conclusions: 1. No earphones are TVs. 2. Some headphones are not TVs. 3. Some headphones are telephones. 4. Some telephones are not TVs. Select the correct code:

30.

In each of the following questions, some conclusions marked 1, 2, and so on are drawn from the given statements. Select the answer choice that presents only correct conclusions. Q14. Statements: i. Some headphones are earphones. ii. All earphones are telephones. iii. No telephones are TVs. Conclusions: 1. No earphones are TVs. 2. Some headphones are not TVs. 3. Some headphones are telephones. 4. Some telephones are not TVs. Select the correct code:

Answer»

In each of the following questions, some conclusions marked 1, 2, and so on are drawn from the given statements. Select the answer choice that presents only correct conclusions.

Q14. Statements:

i. Some headphones are earphones.

ii. All earphones are telephones.

iii. No telephones are TVs.

Conclusions:

1. No earphones are TVs.

2. Some headphones are not TVs.

3. Some headphones are telephones.

4. Some telephones are not TVs.

Select the correct code:

Discussion

31.	Figure shows the variation of energy with the orbit radius r of a satellite in a circular motion. Mark the correct statement.
Answer» Figure shows the variation of energy with the orbit radius r of a satellite in a circular motion. Mark the correct statement.

31.

Figure shows the variation of energy with the orbit radius r of a satellite in a circular motion. Mark the correct statement.

Answer»

Figure shows the variation of energy with the orbit radius r of a satellite in a circular motion. Mark the correct statement.

Discussion

32.	A container filled with liquid upto height h is placed on a smooth horizontal surface. Container is having a small hole at the bottom. As the liquid comes out from the hole, the container moves in a backward direction with acceleration 'a' and finally, when all the liquid is drained out acquires a velocity . Neglect mass of container. In this case -
Answer» A container filled with liquid upto height h is placed on a smooth horizontal surface. Container is having a small hole at the bottom. As the liquid comes out from the hole, the container moves in a backward direction with acceleration 'a' and finally, when all the liquid is drained out acquires a velocity . Neglect mass of container. In this case -

32.

A container filled with liquid upto height h is placed on a smooth horizontal surface. Container is having a small hole at the bottom. As the liquid comes out from the hole, the container moves in a backward direction with acceleration 'a' and finally, when all the liquid is drained out acquires a velocity . Neglect mass of container. In this case -

Answer»

A container filled with liquid upto height h is placed on a smooth horizontal surface. Container is having a small hole at the bottom. As the liquid comes out from the hole, the container moves in a backward direction with acceleration 'a' and finally, when all the liquid is drained out acquires a velocity . Neglect mass of container. In this case -

Discussion

33.	Three identical stars of mass m each are located at the corner of equilateral triangle of side L and are orbiting under mutual gravitational force. Orbital speed of such 3 star system is V0=√pGmL then p is
Answer» Three identical stars of mass $m$ each are located at the corner of equilateral triangle of side $L$ and are orbiting under mutual gravitational force. Orbital speed of such 3 star system is $V_{0} = \sqrt{\frac{p G m}{L}}$ then $p$ is

Discussion

34.	Two objects start their motion at some time. One is sliding down from rest on smooth fixed slope and other being thrown from point R at an angle θ if both get to point P at same instant and at same speed.than if sin2θ=4n+√2m2L then, (n×L)+m
Answer» Two objects start their motion at some time. One is sliding down from rest on smooth fixed slope and other being thrown from point R at an angle $θ$ if both get to point P at same instant and at same speed.than if $s i n^{2} θ = \frac{4 n + \sqrt{2 m}}{2 L}$ then, $(n \times L) + m$

Discussion

35.	Plank m is on a frictionless surface. The block and plank are given initial velocity as shown in figure. Friction is present only between blocks. Find velocity of masses when slipping stops.
Answer» Plank m is on a frictionless surface. The block and plank are given initial velocity as shown in figure. Friction is present only between blocks. Find velocity of masses when slipping stops.

35.

Plank m is on a frictionless surface. The block and plank are given initial velocity as shown in figure. Friction is present only between blocks. Find velocity of masses when slipping stops.

Answer»

Plank m is on a frictionless surface. The block and plank are given initial velocity as shown in figure. Friction is present only between blocks. Find velocity of masses when slipping stops.

Discussion

36.	∫2x(x−x−3)dx is equal to
Answer» $\int 2 x (x - x^{- 3}) d x$ is equal to

Discussion

37.	The diagram shows a part of disc of radius R carrying uniformly distributed charge of density σ. Electric potential at the centre O of parent disc is
Answer» The diagram shows a part of disc of radius $R$ carrying uniformly distributed charge of density $σ$ . Electric potential at the centre $O$ of parent disc is

Discussion

38.	At a certain place, the horizontal component of earth's magnetic field is √3 times the vertical component. The angle of dip at that place is
Answer» At a certain place, the horizontal component of earth's magnetic field is $\sqrt{3}$ times the vertical component. The angle of dip at that place is

Discussion

39.	The distance x moved by a body of mass 0.5 kg due to a force varies with time t as x=3t2+4t+5 where x is expressed in metre and t in second. What is the work done by the force in the first 2 seconds?
Answer» The distance $x$ moved by a body of mass 0.5 kg due to a force varies with time $t$ as $x = 3 t^{2} + 4 t + 5$ where $x$ is expressed in metre and t in second. What is the work done by the force in the first 2 seconds?

Discussion

40.	An aqueous solution containing 28% by mass of liquid X (M.M = 140) has a vapor pressure 160 mm at 30∘C. Find the vapor pressure of pure liquid X. (Given: vapor pressure of water at 30∘C is 150 mm)
Answer» An aqueous solution containing $28 %$ by mass of liquid X (M.M = 140) has a vapor pressure 160 mm at $30^{\circ}$ C. Find the vapor pressure of pure liquid X. (Given: vapor pressure of water at $30^{\circ}$ C is 150 mm)

Discussion

41.	How to find the direction of the electric field?
Answer» How to find the direction of the electric field?

Discussion

42.	A light string passes over a frictionless pulley. To one of its ends, a mass of 6 kg is attached. To its other end, a mass of 10 kg is attached. The tension in the string will be
Answer» A light string passes over a frictionless pulley. To one of its ends, a mass of 6 kg is attached. To its other end, a mass of 10 kg is attached. The tension in the string will be

Discussion

43.	Water has maximum density at __.
Answer» Water has maximum density at __.

Discussion

44.	A flywheel of moment of inertia 5.0kg−m2 is rotated at a speed of 60rad/s. Because of the friction at the axle, it comes to rest in 5.0 minutes. Find (a) the average torque of the friction, (b) the total work done by the friction and (c) the angular momentum of the wheel 1 minute before it stops rotating.
Answer» A flywheel of moment of inertia $5.0 k g - m^{2}$ is rotated at a speed of 60rad/s. Because of the friction at the axle, it comes to rest in 5.0 minutes. Find (a) the average torque of the friction, (b) the total work done by the friction and (c) the angular momentum of the wheel 1 minute before it stops rotating.

44.

A flywheel of moment of inertia 5.0kg−m2 is rotated at a speed of 60rad/s. Because of the friction at the axle, it comes to rest in 5.0 minutes. Find (a) the average torque of the friction, (b) the total work done by the friction and (c) the angular momentum of the wheel 1 minute before it stops rotating.

Answer»

A flywheel of moment of inertia $5.0 k g - m^{2}$ is rotated at a speed of 60rad/s. Because of the friction at the axle, it comes to rest in 5.0 minutes.

Find

(a) the average torque of the friction,

(b) the total work done by the friction and

(c) the angular momentum of the wheel 1 minute before it stops rotating.

Discussion

45.	If an insulated non-conducting sphere of radius R has charge density ρ. The electric field at a distance r from the centre of sphere (r < R) will be
Answer» If an insulated non-conducting sphere of radius R has charge density $ρ$ . The electric field at a distance r from the centre of sphere (r < R) will be

Discussion

46.	A body of density d1 is counterpoised by M g of weights of density d2 in air of density d. Then the true mass of the body is
Answer» A body of density $d_{1}$ is counterpoised by M g of weights of density $d_{2}$ in air of density d. Then the true mass of the body is

Discussion

47.	A package is kept on a conveyor belt and the system is at rest. The belt starts to move to the right for 1.3 s with a constant acceleration of 2 m/s2. The belt then moves with constant deceleration a m/s2 and comes to a stop after a total displacement of 2.2 m. Knowing that the coefficient of static friction between the package and the belt is 0.35 and coefficient of kinetic friction is 0.25. Then determine the displacement of the package relative to the belt as the belt comes to stop. Take g=10 m/s2.
Answer» A package is kept on a conveyor belt and the system is at rest. The belt starts to move to the right for $1.3 s$ with a constant acceleration of $2 {m/s}^{2}$ . The belt then moves with constant deceleration $a {m/s}^{2}$ and comes to a stop after a total displacement of $2.2 m$ . Knowing that the coefficient of static friction between the package and the belt is $0.35$ and coefficient of kinetic friction is $0.25$ . Then determine the displacement of the package relative to the belt as the belt comes to stop. Take $g = 10 {m/s}^{2}$ .

Discussion

48.	Two metal wires of identical dimensions are connected in series. If σ1 and σ2 are the conductivities of the metals respectively, the effective conductivity of the combination is
Answer» Two metal wires of identical dimensions are connected in series. If $σ_{1}$ and $σ_{2}$ are the conductivities of the metals respectively, the effective conductivity of the combination is

Discussion

49.	A 20 cm long string, having a mass of 1.0 g, is fixed at both the ends. The tension in the string is 0.5 N. The string is set into vibrations using an external vibrator of frequency 100 Hz. Find the separation (in cm) between the successive nodes on the string. ___
Answer» A 20 cm long string, having a mass of 1.0 g, is fixed at both the ends. The tension in the string is 0.5 N. The string is set into vibrations using an external vibrator of frequency 100 Hz. Find the separation (in cm) between the successive nodes on the string. ___

Discussion

50.	A thick walled hollow sphere has outer radius R. It rolls down an inclined plane without slipping and its speed at bottom is v0. Now the incline is waxed so that the friction becomes zero. The sphere is observed to slide down without rolling and the speed now is (5v04). The radius of gyration of the hollow sphere about the axis through its centre is
Answer» A thick walled hollow sphere has outer radius $R$ . It rolls down an inclined plane without slipping and its speed at bottom is $v_{0}$ . Now the incline is waxed so that the friction becomes zero. The sphere is observed to slide down without rolling and the speed now is $(5 \frac{v_{0}}{4})$ . The radius of gyration of the hollow sphere about the axis through its centre is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A body starts from rest with a uniform acceleration. If its velocity after n second is v, then its displacement in the last 2 s is

A particle is performing a linear simple harmonic motion. If the acceleration and the corresponding velocity of the particle are a and v respectively, which of the following graphs is correct?

Three students measure the length of a rod and reports 13.59 m, 0.01359 km and 1359 cm respectively. Then the difference between the maximum and minimum number of significant figures for the given data is

Calculate the parallax of a star (in sec) at the distance of 4.29 light years when viewed from two locations of earth six months apart in its orbit around the sun. Answer upto 2 places of decimal ( Assume diameter of earths orbit around sun to be 3×1011 m)

Terminal velocity of Mars rover depends upon P = gas density of atmosphere of mars A = frontal area W = weight of falling object What may be the possible relation between terminal velocity v and given quantity.

A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by 1 m/s so as to have same K.E. as that of boy. The original speed of the man will be

Point charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of net electric dipole moment of the system is

Figure shows three circuits with identical batteries, inductor and resistors. Rank the circuits in the decreasing order of the current through the battery just after the switch is closed

Convert π6, 5π radians to degrees

A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the internal energy?

Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature by definite fraction of its volume at

The voltmeter shown in figure (32-E25) reads 18 V across the 50 Ω resistor. Find the resistance of the voltmeter. figure (32-E25)

In a double slit experiment when light of wavelength 400 nm was used the angular width of the first minima formed on a screen placed 1 m away was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μwater = 4/3)

What will be work done in supplying 400 calories of heat to a system?

Find the equivalent capacitance of the infinite ladder shown in figure (31-E17) between the points. A and B.

A ball is projected with an initial speed u at an angle θ from the horizontal ground. The coefficient of restitution between the ball and the ground is e. Find the position from the starting point when the ball will land on the ground for the 2nd time.

A car moving at 40 km/h is to be stopped by applying brakes in the next 4.0 m. If the car weighs 2000 kg, what average force must be applied on it ?

You have been given a box filled with two gases - oxygen, and an unknown gas. It is seen that at any temperature of the mixture, the rms speed of the unknown gas is always four times that of oxygen. Can you identify this gas?

A projectile is given an initial velocity of

A body of mass m kg starts falling from a point 2R above the earth's surface. Its kinetic energy when it has fallen to a point 'R' above the earth's surface [R-Radius of earth]

Two blocks of masses m1 n m2 connected by a massless spring of spring constant k rest on a smooth horizontal plane . block 2 is shifted a small distance x to the left and then released . find the velocity of com of the system after block breaks off the wall.

If the horizontal force needed for the turn in the previous problem is to be supplied by the normal force by the road, what should be the proper angle of banking ?

An aeroplane is flying horizontally with a velocity of 600 km/h at a height of 1960 m. When it is vertically above a point A (point A on the ground), a bomb is released from it. The bomb strikes the ground at point B. The horizontal distance AB is

In the given figure, what maximum force F can be applied on wedge of mass M, so that block of mass m does not move with respect to wedge.

Which one of the following statements is wrong for gases

On a rough horizontal floor four objects are rolling without slipping. They are i) a solid sphere ii) a hollow spherical shell iii) a solid cylinder iv) a hollow cylinder. If all of them have the same mass and linear velocity for their centres of mass, which object has more kinetic energy?

From the foot of a tower 90 m high, a stone is thrown up so as to reach the top of the tower with zero velocity. Two seconds later another stone is dropped from the top of the tower. Find when will two stones meet for the first time ?

Figure shows the variation of energy with the orbit radius r of a satellite in a circular motion. Mark the correct statement.

Three identical stars of mass m each are located at the corner of equilateral triangle of side L and are orbiting under mutual gravitational force. Orbital speed of such 3 star system is V0=√pGmL then p is

Two objects start their motion at some time. One is sliding down from rest on smooth fixed slope and other being thrown from point R at an angle θ if both get to point P at same instant and at same speed.than if sin2θ=4n+√2m2L then, (n×L)+m

Plank m is on a frictionless surface. The block and plank are given initial velocity as shown in figure. Friction is present only between blocks. Find velocity of masses when slipping stops.

∫2x(x−x−3)dx is equal to

The diagram shows a part of disc of radius R carrying uniformly distributed charge of density σ. Electric potential at the centre O of parent disc is

At a certain place, the horizontal component of earth's magnetic field is √3 times the vertical component. The angle of dip at that place is

The distance x moved by a body of mass 0.5 kg due to a force varies with time t as x=3t2+4t+5 where x is expressed in metre and t in second. What is the work done by the force in the first 2 seconds?

An aqueous solution containing 28% by mass of liquid X (M.M = 140) has a vapor pressure 160 mm at 30∘C. Find the vapor pressure of pure liquid X. (Given: vapor pressure of water at 30∘C is 150 mm)

How to find the direction of the electric field?

A light string passes over a frictionless pulley. To one of its ends, a mass of 6 kg is attached. To its other end, a mass of 10 kg is attached. The tension in the string will be

Water has maximum density at __.

If an insulated non-conducting sphere of radius R has charge density ρ. The electric field at a distance r from the centre of sphere (r < R) will be

A body of density d1 is counterpoised by M g of weights of density d2 in air of density d. Then the true mass of the body is

Two metal wires of identical dimensions are connected in series. If σ1 and σ2 are the conductivities of the metals respectively, the effective conductivity of the combination is

A 20 cm long string, having a mass of 1.0 g, is fixed at both the ends. The tension in the string is 0.5 N. The string is set into vibrations using an external vibrator of frequency 100 Hz. Find the separation (in cm) between the successive nodes on the string. ___