50278 + Interview Questions in Physics

1.	A body is moving from rest under constant acceleration and let S1 be the displacement in the first (p–1) sec and S2 be the displacement in the first p sec. The displacement in (p2–p+1)th sec will be
Answer» A body is moving from rest under constant acceleration and let $S_{1}$ be the displacement in the first $(p - 1) sec$ and $S_{2}$ be the displacement in the first $p sec$ . The displacement in $(p^{2} - p + 1)^{th} sec$ will be

Discussion

2.	A set of n equal Resistances of value R each are connected in series to a battery of emf E, and internal Resistance R, then the current drawn is I. Now when the n resistors are connected in parallel to same battery, then current drawn is I′, Find the relation between I and I′ ?
Answer» A set of $n$ equal Resistances of value R each are connected in series to a battery of emf $E$ , and internal Resistance $R$ , then the current drawn is $I$ . Now when the $n$ resistors are connected in parallel to same battery, then current drawn is $I^{'}$ , Find the relation between $I$ and $I^{'}$ ?

Discussion

3.	Four charge particles α, proton, deuteron and Li+++ are projected in a uniform magnetic field perpendicular to their velocity. Consider the radius of the particle having least radius out of these to be r, List-1 gives the particles and List-2 gives value of n, where nr is the radius of the particle. Match the entries correctly in the lists if kinetic energy of each particle is same. List-1List-2(I)α(P)1(II)Proton(Q)2(III)Deuteron(R)3(IV)Li+++(S)3√7(T)3√2√7(U)32
Answer» Four charge particles $α$ , proton, deuteron and $L i^{+ + +}$ are projected in a uniform magnetic field perpendicular to their velocity. Consider the radius of the particle having least radius out of these to be r, List-1 gives the particles and List-2 gives value of n, where nr is the radius of the particle. Match the entries correctly in the lists if kinetic energy of each particle is same. $\begin{matrix} List-1 & List-2 (I) & α & (P) & 1 (II) & Proton & (Q) & 2 (III) & Deuteron & (R) & 3 (IV) & L i^{+ + +} & (S) & \frac{3}{\sqrt{7}} (T) & \frac{3 \sqrt{2}}{\sqrt{7}} (U) & \frac{3}{2} \end{matrix}$

Discussion

4.	In the figure shown, the 12 kg body pulled by a string with an acceleration a=2.2 m/s2. The tension T1 and T2 will be respectively (Take g=9.8 m/s2)
Answer» In the figure shown, the $12 k g$ body pulled by a string with an acceleration $a = 2.2 m / s^{2}$ . The tension $T_{1}$ and $T_{2}$ will be respectively (Take $g = 9.8 m / s^{2}$ )

Discussion

5.	Two SHM’s are represented by the equations, y1=0.1sin(100πt+π3) and y2=0.1cos100πt. The phase difference between the speeds of the two particles is,
Answer» Two SHM’s are represented by the equations, $y_{1} = 0.1 s i n (100 π t + \frac{π}{3})$ and $y_{2} = 0.1 c o s 100 π t$ . The phase difference between the speeds of the two particles is,

Discussion

6.	The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the
Answer» The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the

6.

The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the

Answer»

The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the

Discussion

7.	YDSE is carried out with two thin sheets of thickness 10.5 mm each and refractive indices μ1=1.5 and μ2=1.4 covering the slits S1 and S2 respectively. If white light of range 4000 ∘A to 7800 ∘A is used then which wavelength will form minima exactly at the centre O of the screen
Answer» YDSE is carried out with two thin sheets of thickness 10.5 mm each and refractive indices $μ_{1} = 1.5 a n d μ_{2} = 1.4$ covering the slits $S_{1}$ and $S_{2}$ respectively. If white light of range 4000 $^{\circ}$ to 7800 $^{\circ}$ is used then which wavelength will form minima exactly at the centre O of the screen

Discussion

8.	In a given process if ΔT=0 for an ideal gas. Then which of the following graph represent this process?
Answer» In a given process if $Δ T = 0$ for an ideal gas. Then which of the following graph represent this process?

Discussion

9.	A vessel containing one mole of a monatomic ideal gas (molecular weight = 20gmol−1 is moving on a floor at aspeed of 50 m.s−1. The vessel is stopped suddenly. Assuiming that the mechnical energy lost has gone into the internal energy of the gas, find the rise in its temperature.
Answer» A vessel containing one mole of a monatomic ideal gas (molecular weight = $20 g m o l^{- 1}$ is moving on a floor at aspeed of 50 $m . s^{- 1} .$ The vessel is stopped suddenly. Assuiming that the mechnical energy lost has gone into the internal energy of the gas, find the rise in its temperature.

9.

A vessel containing one mole of a monatomic ideal gas (molecular weight = 20gmol−1 is moving on a floor at aspeed of 50 m.s−1. The vessel is stopped suddenly. Assuiming that the mechnical energy lost has gone into the internal energy of the gas, find the rise in its temperature.

Answer»

A vessel containing one mole of a monatomic ideal gas (molecular weight = $20 g m o l^{- 1}$ is moving on a floor at aspeed of 50 $m . s^{- 1} .$ The vessel is stopped suddenly. Assuiming that the mechnical energy lost has gone into the internal energy of the gas, find the rise in its temperature.

Discussion

10.	A hexagon of side 8 cm has a charge 4μC at each of its vertices. The potential at the centre of the hexagon is:
Answer» A hexagon of side 8 cm has a charge $4 μ C$ at each of its vertices. The potential at the centre of the hexagon is:

Discussion

11.	Block B has mass m and is released from rest when it is on top of wedge A, which has a mass 3m. Determine the tension in cord CD needed to hold the wedge from moving while B is sliding down A. Neglect friction.
Answer» Block B has mass m and is released from rest when it is on top of wedge A, which has a mass 3m. Determine the tension in cord CD needed to hold the wedge from moving while B is sliding down A. Neglect friction.

11.

Block B has mass m and is released from rest when it is on top of wedge A, which has a mass 3m. Determine the tension in cord CD needed to hold the wedge from moving while B is sliding down A. Neglect friction.

Answer»

Block B has mass m and is released from rest when it is on top of wedge A, which has a mass 3m. Determine the tension in cord CD needed to hold the wedge from moving while B is sliding down A. Neglect friction.

Discussion

12.	Proton, deuteron and alpha particle of the same kinetic energy are moving in circular field. The radii of proton, deuteron and alpha particle are respectively rp, rd and rα. Which one of the following relations is correct?
Answer» Proton, deuteron and alpha particle of the same kinetic energy are moving in circular field. The radii of proton, deuteron and alpha particle are respectively $r_{p}$ , $r_{d}$ and $r_{α}$ . Which one of the following relations is correct?

Discussion

13.	An electromagnetic wave in vacuum has the electric and magnetic field →E and →B, which are always perpendicular to each other. The direction of polarization is given by →X and that of wave propagation by →k. Then
Answer» An electromagnetic wave in vacuum has the electric and magnetic field $\to E$ and $\to B$ , which are always perpendicular to each other. The direction of polarization is given by $\to X$ and that of wave propagation by $\to k$ . Then

Discussion

14.	A beam of light of wavelength λ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then
Answer» A beam of light of wavelength $λ$ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then

Discussion

15.	Outside of office of CEO of company, a name plate is hanging as shown in figure. Now plate is slightly shifted by 'x' as shown in figure, find time period of oscillation.
Answer» Outside of office of CEO of company, a name plate is hanging as shown in figure. Now plate is slightly shifted by 'x' as shown in figure, find time period of oscillation.

Discussion

16.	In the pulleys system as shown in the figure a particle of mass m falls from a height h0 on the mass m and gets stuck to it. Speed with which the system moves just after the collision is:
Answer» In the pulleys system as shown in the figure a particle of mass m falls from a height $h_{0}$ on the mass m and gets stuck to it. Speed with which the system moves just after the collision is:

Discussion

17.	The gravitational field intensity →E of earth at any point is defined as the gravitational force per unit mass at that point. It varies from place to place. The variation is shown in column II with position →r vs the →E in the form of graphs. The variation of →r is given in column I. Choose the correct form of graphs for the corresponding variations of →r.
Answer» The gravitational field intensity $\to E$ of earth at any point is defined as the gravitational force per unit mass at that point. It varies from place to place. The variation is shown in column II with position $\to r$ vs the $\to E$ in the form of graphs. The variation of $\to r$ is given in column I. Choose the correct form of graphs for the corresponding variations of $\to r .$

Discussion

18.	In a simple microscope, if the final image is located at infinity then its magnifying power is; (D is the least distance for distinct vision in the simple microscope)
Answer» In a simple microscope, if the final image is located at infinity then its magnifying power is; ( $D$ is the least distance for distinct vision in the simple microscope)

Discussion

19.	If one mole of gas is taken through this cyclic process, the work done by the gas is -
Answer» If one mole of gas is taken through this cyclic process, the work done by the gas is -

19.

If one mole of gas is taken through this cyclic process, the work done by the gas is -

Answer»

If one mole of gas is taken through this cyclic process, the work done by the gas is -

Discussion

20.	The number of ways to reach the point Q(4,5,3) from point P(1,2,1) in the space where movement is only allowed parallel to the three axes and change of direction is allowed only at the integral points is
Answer» The number of ways to reach the point $Q (4, 5, 3)$ from point $P (1, 2, 1)$ in the space where movement is only allowed parallel to the three axes and change of direction is allowed only at the integral points is

Discussion

21.	On interchanging, the resistances, the balance point of a meter bridge shifts to left by 10 cm. The resistance of their series combination is 1 kΩ. How much was the resistance on the left slot before interchanging the resistances?
Answer» On interchanging, the resistances, the balance point of a meter bridge shifts to left by $10 cm$ . The resistance of their series combination is $1 k Ω$ . How much was the resistance on the left slot before interchanging the resistances?

Discussion

22.	A square frame is made using four thin uniform rods of length l each having linear mass densities λ, 2λ, 3λ and 4λ as shown in the figure. Which of the following is correct?
Answer» A square frame is made using four thin uniform rods of length $l$ each having linear mass densities $λ, 2 λ, 3 λ$ and $4 λ$ as shown in the figure. Which of the following is correct?

Discussion

23.	In the arrangement as shown, tension T2 is (g=10 m/s2)
Answer» In the arrangement as shown, tension $T_{2}$ is ( $g = 10 {m/s}^{2}$ )

Discussion

24.	The wheel started from rest is uniformly accelerated with alpha = 4 rad/second Square for 10 sec. It is then allowed to rotate uniformly for next 2 sec & is finally brought to rest in the next 10 sec . Find the total angle rotated by the wheel .
Answer» The wheel started from rest is uniformly accelerated with alpha = 4 rad/second Square for 10 sec. It is then allowed to rotate uniformly for next 2 sec & is finally brought to rest in the next 10 sec . Find the total angle rotated by the wheel .

Discussion

25.	Devices and technique used in space exploration (SLS).
Answer» Devices and technique used in space exploration (SLS).

Discussion

26.	If T is the surface tension of a liquid, then the energy needed to break the liquid drop of radius R into 64 identical drops is
Answer» If $T$ is the surface tension of a liquid, then the energy needed to break the liquid drop of radius $R$ into $64$ identical drops is

Discussion

27.	Two identical blocks A and B of mass M each are kept on each other on a smooth horizontal plane. There exists friction between A and B. If a bullet of mass m hits the lower block with a horizontal velocity v and gets embedded into it, the work done by friction between A and B is
Answer» Two identical blocks A and B of mass M each are kept on each other on a smooth horizontal plane. There exists friction between A and B. If a bullet of mass m hits the lower block with a horizontal velocity v and gets embedded into it, the work done by friction between A and B is

Discussion

28.	The angular displacement of a particle is given by theta =t^3+t^2+t+1 then it's angular velocity at t=2sec is given by__________rad per sec
Answer» The angular displacement of a particle is given by theta =t^3+t^2+t+1 then it's angular velocity at t=2sec is given by__________rad per sec

Discussion

29.	The adjoining diagram shows the spectral energy density distribution Eλ of a black body at two different temperatures. If the areas under the curves are in the ratio 16:1, the value of temperature T is
Answer» The adjoining diagram shows the spectral energy density distribution $E_{λ}$ of a black body at two different temperatures. If the areas under the curves are in the ratio $16 : 1$ , the value of temperature $T$ is

Discussion

30.	Arrangement of two block system is as shown. The net force acting on 1 kg and 2 kg blocks are (assuming the surfaces to be frictionless) respectively.
Answer» Arrangement of two block system is as shown. The net force acting on $1 kg$ and $2 kg$ blocks are (assuming the surfaces to be frictionless) respectively.

Discussion

31.	A weakly damped harmonic oscillator of frequency n1 is driven by an external periodic force of frequency n2. When the steady state is reached, the frequency of the oscillator will be
Answer» A weakly damped harmonic oscillator of frequency $n_{1}$ is driven by an external periodic force of frequency $n_{2}$ . When the steady state is reached, the frequency of the oscillator will be

Discussion

32.	A ball is rolling on ice with velocity of 4.9m/s, stop after travelling 4m.What is the coefficient of friction
Answer» A ball is rolling on ice with velocity of 4.9m/s, stop after travelling 4m.What is the coefficient of friction

Discussion

33.	A convex lens is cut in half along its principal axis and the two halves are separated by a distance of 12 cm. An object is placed 6 cm in front of the lens as shown in Figure. Two sharp images are formed on the screen placed 80 cm from the object. What is the focal length of the lens ?
Answer» A convex lens is cut in half along its principal axis and the two halves are separated by a distance of 12 cm. An object is placed 6 cm in front of the lens as shown in Figure. Two sharp images are formed on the screen placed 80 cm from the object. What is the focal length of the lens ?

Discussion

34.	A ball is dropped from a hieght of 5m onto a Sandy floor and penetrates the sand upto 10 cm before coming to rest . Find the retardation of the ball in sand assuming it to be uniform.
Answer» A ball is dropped from a hieght of 5m onto a Sandy floor and penetrates the sand upto 10 cm before coming to rest . Find the retardation of the ball in sand assuming it to be uniform.

Discussion

35.	Force of attraction between two point electric charges placed at a distance"d" in a medium is "F". What distance apart should these be kept in the same medium, so that force between them become F/3?
Answer» Force of attraction between two point electric charges placed at a distance"d" in a medium is "F". What distance apart should these be kept in the same medium, so that force between them become F/3?

Discussion

36.	If I1 is the moment of inertia of a thin rod about an axis perpendicular to its length and passing through its centre of mass and I2 is the moment of inertia of the ring (formed by bending the rod) about an axis perpendicular to the plane of ring and passing through its centre, then the ratio I1I2 is
Answer» If $I_{1}$ is the moment of inertia of a thin rod about an axis perpendicular to its length and passing through its centre of mass and $I_{2}$ is the moment of inertia of the ring (formed by bending the rod) about an axis perpendicular to the plane of ring and passing through its centre, then the ratio $\frac{I_{1}}{I_{2}}$ is

Discussion

37.	A transformer ia used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5amp ,the efficiency of the transformer is approx 1)10% 2)30% 3)50% 4)90%
Answer» A transformer ia used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5amp ,the efficiency of the transformer is approx 1)10% 2)30% 3)50% 4)90%

37.

A transformer ia used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5amp ,the efficiency of the transformer is approx 1)10% 2)30% 3)50% 4)90%

Answer»

A transformer ia used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5amp ,the efficiency of the transformer is approx

1)10%

2)30%

3)50%

4)90%

Discussion

38.	A Ball is dropped vertically from rest at a height of 12m. After striking the ground it bounces of 9m . What fraction of its kinetic energy does it loose on striking the ground?
Answer» A Ball is dropped vertically from rest at a height of 12m. After striking the ground it bounces of 9m . What fraction of its kinetic energy does it loose on striking the ground?

Discussion

39.	Explain the velocity of money.
Answer» Explain the velocity of money.

Discussion

40.	If Momentum of A body increases By 50 Percentage, By what percentage will the energy increases ?
Answer» If Momentum of A body increases By 50 Percentage, By what percentage will the energy increases ?

Discussion

41.	Ratio of equivalent resistance between terminals A and B to terminals C and D i.e. RABRCD
Answer» Ratio of equivalent resistance between terminals A and B to terminals C and D i.e. $\frac{R_{A B}}{R_{C D}}$

Discussion

42.	A uniform rod of length l is acted upon by a force F in a gravity free region, as shown in the figure. If the area of cross-section of the rod is A and its Young's modulus is Y, then the elastic potential energy stored in the rod due to elongation is
Answer» A uniform rod of length $l$ is acted upon by a force $F$ in a gravity free region, as shown in the figure. If the area of cross-section of the rod is $A$ and its Young's modulus is $Y$ , then the elastic potential energy stored in the rod due to elongation is

Discussion

43.	A vertical rod of length l is moved with constant velocity v towards east. The vertical component of Earth magnetic field is B and angle of dip is theta. The induced e.m.f in the rod is?
Answer» A vertical rod of length l is moved with constant velocity v towards east. The vertical component of Earth magnetic field is B and angle of dip is theta. The induced e.m.f in the rod is?

Discussion

44.	If the masses of two satellites are 4m and m, and they orbit the Earth in circular orbit of radii r and 3r respectively, then find the ratio of their orbital speeds?
Answer» If the masses of two satellites are 4m and m, and they orbit the Earth in circular orbit of radii r and 3r respectively, then find the ratio of their orbital speeds?

Discussion

45.	Spherical wave fronts shown in figure, strike a plane mirror. Reflected wave fronts will be as shown in
Answer» Spherical wave fronts shown in figure, strike a plane mirror. Reflected wave fronts will be as shown in

Discussion

46.	The distance between the nearest node and antinode in a stationary wave is [MP PET 1984; CBSE PMT 1993; AFMC 1996; RPET 2002]
Answer» The distance between the nearest node and antinode in a stationary wave is [MP PET 1984; CBSE PMT 1993; AFMC 1996; RPET 2002]

46.

The distance between the nearest node and antinode in a stationary wave is [MP PET 1984; CBSE PMT 1993; AFMC 1996; RPET 2002]

Answer»

The distance between the nearest node and antinode in a stationary wave is

[MP PET 1984; CBSE PMT 1993; AFMC 1996; RPET 2002]

Discussion

47.	A ball is dropped from a height h above floor. If the coefficient of restitution between the floor and the ball is 'e' , the ball, after the first rebound, will rise to a height of
Answer» A ball is dropped from a height h above floor. If the coefficient of restitution between the floor and the ball is 'e' , the ball, after the first rebound, will rise to a height of

Discussion

48.	In Fraunhoffer diffraction pattern due to a single slit, the slit of width 0.1 mm is illuminated by monochromatic light of wavelength 600 nm. What is the ratio of separation between the central maximum and first secondary minimum to the distance between screen and the slit?
Answer» In Fraunhoffer diffraction pattern due to a single slit, the slit of width $0.1 m m$ is illuminated by monochromatic light of wavelength $600 n m$ . What is the ratio of separation between the central maximum and first secondary minimum to the distance between screen and the slit?

Discussion

49.	The length of second's hand in a watch is 1 cm. The change in velocity of its tip in 15 seconds is
Answer» The length of second's hand in a watch is 1 cm. The change in velocity of its tip in 15 seconds is

Discussion

50.	A vertical column 50 cm long at 50circ C balances another column of same liquid 60 cm long at 100circ°C. The coefficient of absolute expansion of the liquid is
Answer» A vertical column 50 cm long at $50^{c} i r c$ C balances another column of same liquid 60 cm long at $100^{c} i r c$ °C. The coefficient of absolute expansion of the liquid is

50.

A vertical column 50 cm long at 50circ C balances another column of same liquid 60 cm long at 100circ°C. The coefficient of absolute expansion of the liquid is

Answer»

A vertical column 50 cm long at $50^{c} i r c$ C balances another column of same liquid 60 cm long at $100^{c} i r c$ °C. The coefficient of absolute expansion of the liquid is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A body is moving from rest under constant acceleration and let S1 be the displacement in the first (p–1) sec and S2 be the displacement in the first p sec. The displacement in (p2–p+1)th sec will be

A set of n equal Resistances of value R each are connected in series to a battery of emf E, and internal Resistance R, then the current drawn is I. Now when the n resistors are connected in parallel to same battery, then current drawn is I′, Find the relation between I and I′ ?

In the figure shown, the 12 kg body pulled by a string with an acceleration a=2.2 m/s2. The tension T1 and T2 will be respectively (Take g=9.8 m/s2)

Two SHM’s are represented by the equations, y1=0.1sin(100πt+π3) and y2=0.1cos100πt. The phase difference between the speeds of the two particles is,

The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the

YDSE is carried out with two thin sheets of thickness 10.5 mm each and refractive indices μ1=1.5 and μ2=1.4 covering the slits S1 and S2 respectively. If white light of range 4000 ∘A to 7800 ∘A is used then which wavelength will form minima exactly at the centre O of the screen

In a given process if ΔT=0 for an ideal gas. Then which of the following graph represent this process?

A vessel containing one mole of a monatomic ideal gas (molecular weight = 20gmol−1 is moving on a floor at aspeed of 50 m.s−1. The vessel is stopped suddenly. Assuiming that the mechnical energy lost has gone into the internal energy of the gas, find the rise in its temperature.

A hexagon of side 8 cm has a charge 4μC at each of its vertices. The potential at the centre of the hexagon is:

Block B has mass m and is released from rest when it is on top of wedge A, which has a mass 3m. Determine the tension in cord CD needed to hold the wedge from moving while B is sliding down A. Neglect friction.

Proton, deuteron and alpha particle of the same kinetic energy are moving in circular field. The radii of proton, deuteron and alpha particle are respectively rp, rd and rα. Which one of the following relations is correct?

An electromagnetic wave in vacuum has the electric and magnetic field →E and →B, which are always perpendicular to each other. The direction of polarization is given by →X and that of wave propagation by →k. Then

A beam of light of wavelength λ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then

Outside of office of CEO of company, a name plate is hanging as shown in figure. Now plate is slightly shifted by 'x' as shown in figure, find time period of oscillation.

In the pulleys system as shown in the figure a particle of mass m falls from a height h0 on the mass m and gets stuck to it. Speed with which the system moves just after the collision is:

In a simple microscope, if the final image is located at infinity then its magnifying power is; (D is the least distance for distinct vision in the simple microscope)

If one mole of gas is taken through this cyclic process, the work done by the gas is -

The number of ways to reach the point Q(4,5,3) from point P(1,2,1) in the space where movement is only allowed parallel to the three axes and change of direction is allowed only at the integral points is

On interchanging, the resistances, the balance point of a meter bridge shifts to left by 10 cm. The resistance of their series combination is 1 kΩ. How much was the resistance on the left slot before interchanging the resistances?

A square frame is made using four thin uniform rods of length l each having linear mass densities λ, 2λ, 3λ and 4λ as shown in the figure. Which of the following is correct?

In the arrangement as shown, tension T2 is (g=10 m/s2)

The wheel started from rest is uniformly accelerated with alpha = 4 rad/second Square for 10 sec. It is then allowed to rotate uniformly for next 2 sec &amp; is finally brought to rest in the next 10 sec . Find the total angle rotated by the wheel .

Devices and technique used in space exploration (SLS).

If T is the surface tension of a liquid, then the energy needed to break the liquid drop of radius R into 64 identical drops is

Two identical blocks A and B of mass M each are kept on each other on a smooth horizontal plane. There exists friction between A and B. If a bullet of mass m hits the lower block with a horizontal velocity v and gets embedded into it, the work done by friction between A and B is

The angular displacement of a particle is given by theta =t^3+t^2+t+1 then it's angular velocity at t=2sec is given by__________rad per sec

The adjoining diagram shows the spectral energy density distribution Eλ of a black body at two different temperatures. If the areas under the curves are in the ratio 16:1, the value of temperature T is

Arrangement of two block system is as shown. The net force acting on 1 kg and 2 kg blocks are (assuming the surfaces to be frictionless) respectively.

A weakly damped harmonic oscillator of frequency n1 is driven by an external periodic force of frequency n2. When the steady state is reached, the frequency of the oscillator will be

A ball is rolling on ice with velocity of 4.9m/s, stop after travelling 4m.What is the coefficient of friction

A convex lens is cut in half along its principal axis and the two halves are separated by a distance of 12 cm. An object is placed 6 cm in front of the lens as shown in Figure. Two sharp images are formed on the screen placed 80 cm from the object. What is the focal length of the lens ?

A ball is dropped from a hieght of 5m onto a Sandy floor and penetrates the sand upto 10 cm before coming to rest . Find the retardation of the ball in sand assuming it to be uniform.

Force of attraction between two point electric charges placed at a distance"d" in a medium is "F". What distance apart should these be kept in the same medium, so that force between them become F/3?

A transformer ia used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5amp ,the efficiency of the transformer is approx 1)10% 2)30% 3)50% 4)90%

A Ball is dropped vertically from rest at a height of 12m. After striking the ground it bounces of 9m . What fraction of its kinetic energy does it loose on striking the ground?

Explain the velocity of money.

If Momentum of A body increases By 50 Percentage, By what percentage will the energy increases ?

Ratio of equivalent resistance between terminals A and B to terminals C and D i.e. RABRCD

A uniform rod of length l is acted upon by a force F in a gravity free region, as shown in the figure. If the area of cross-section of the rod is A and its Young's modulus is Y, then the elastic potential energy stored in the rod due to elongation is

A vertical rod of length l is moved with constant velocity v towards east. The vertical component of Earth magnetic field is B and angle of dip is theta. The induced e.m.f in the rod is?

If the masses of two satellites are 4m and m, and they orbit the Earth in circular orbit of radii r and 3r respectively, then find the ratio of their orbital speeds?

Spherical wave fronts shown in figure, strike a plane mirror. Reflected wave fronts will be as shown in

The distance between the nearest node and antinode in a stationary wave is [MP PET 1984; CBSE PMT 1993; AFMC 1996; RPET 2002]

A ball is dropped from a height h above floor. If the coefficient of restitution between the floor and the ball is 'e' , the ball, after the first rebound, will rise to a height of

In Fraunhoffer diffraction pattern due to a single slit, the slit of width 0.1 mm is illuminated by monochromatic light of wavelength 600 nm. What is the ratio of separation between the central maximum and first secondary minimum to the distance between screen and the slit?

The length of second's hand in a watch is 1 cm. The change in velocity of its tip in 15 seconds is

A vertical column 50 cm long at 50circ C balances another column of same liquid 60 cm long at 100circ°C. The coefficient of absolute expansion of the liquid is

The wheel started from rest is uniformly accelerated with alpha = 4 rad/second Square for 10 sec. It is then allowed to rotate uniformly for next 2 sec & is finally brought to rest in the next 10 sec . Find the total angle rotated by the wheel .