50278 + Interview Questions in Physics

1.	The magnitude of saturation photoelectric current depends upon
Answer» The magnitude of saturation photoelectric current depends upon

Discussion

2.	Four particles of masses m, 2m, 3m and 4m are kept in sequence at the corners of a square of side a. The magnitude of gravitational force acting on a particle of mass m placed at the centre of the square will be
Answer» Four particles of masses m, 2m, 3m and 4m are kept in sequence at the corners of a square of side a. The magnitude of gravitational force acting on a particle of mass m placed at the centre of the square will be

Discussion

3.	(i) If two similar large plates, each of area A having surface charge densities+ σ and − σ are separated by a distance in air, find the expressions for (a) field at points between the two plates and on outer side of the plates. Specify the direction of the field in each case. (b) the potential difference between the plates. (c) the capacitance of the capacitor so formed. (ii) Two metallic spheres of radii R and 2R are charged so that both of these have same surface charge density σ. If they are connected to each other with a conducting wire, in which direction will the charge flow and why ?
Answer» (i) If two similar large plates, each of area A having surface charge densities $+ σ and - σ$ are separated by a distance in air, find the expressions for (a) field at points between the two plates and on outer side of the plates. Specify the direction of the field in each case. (b) the potential difference between the plates. (c) the capacitance of the capacitor so formed. (ii) Two metallic spheres of radii R and 2R are charged so that both of these have same surface charge density $σ$ . If they are connected to each other with a conducting wire, in which direction will the charge flow and why ?

Discussion

4.	Two conducting cylinders of equal length but different radii are connected in series between two heat baths kept at temperatures T1=300K and T2=100K as shown in the figure. The radius of the bigger cylinder is twice that of the smaller one and the thermal conductivities of the materials of the smaller and the larger cylinders are K1 and K2 respectively. If the temperature at the junction of the two cylinders in the steady state is 200K. Then K1K2=
Answer» Two conducting cylinders of equal length but different radii are connected in series between two heat baths kept at temperatures $T_{1} = 300 K$ and $T_{2} = 100 K$ as shown in the figure. The radius of the bigger cylinder is twice that of the smaller one and the thermal conductivities of the materials of the smaller and the larger cylinders are $K_{1}$ and $K_{2}$ respectively. If the temperature at the junction of the two cylinders in the steady state is $200 K$ . Then $\frac{K_{1}}{K_{2}} =$

Discussion

5.	At any instant the ratio of the amount of radioactive substances is 3 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances
Answer» At any instant the ratio of the amount of radioactive substances is 3 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances

Discussion

6.	One mole of a monoatomic gas is heated using PV32=const. Find the amount of heat obtained in the process, when the temperature changes by ΔT=−26 K
Answer» One mole of a monoatomic gas is heated using $P V^{\frac{3}{2}} = const$ . Find the amount of heat obtained in the process, when the temperature changes by $Δ T = - 26 K$

Discussion

7.	Each situation in column I gives graph of a particle moving in circular path. The variables and t represent angular speed (at any time t ), angular displacement (in time t) and time respectively. Column II gives certain resulting interpretation. Match the graphs in column I with statements in column II.
Answer» Each situation in column I gives graph of a particle moving in circular path. The variables and t represent angular speed (at any time t ), angular displacement (in time t) and time respectively. Column II gives certain resulting interpretation. Match the graphs in column I with statements in column II.

7.

Each situation in column I gives graph of a particle moving in circular path. The variables and t represent angular speed (at any time t ), angular displacement (in time t) and time respectively. Column II gives certain resulting interpretation. Match the graphs in column I with statements in column II.

Answer»

Each situation in column I gives graph of a particle moving in circular path. The variables and t represent angular speed (at any time t ), angular displacement (in time t) and time respectively. Column II gives certain resulting interpretation. Match the graphs in column I with statements in column II.

Discussion

8.	A piece of wire is bent in the shape of a parabola y=kx2 (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire is now accelerated parallel to the x-axis with a constant acceleration a. The distance of the new equilibrium position of the bead, where the bead can stays at rest with respect to the wire, from the y-axis is
Answer» A piece of wire is bent in the shape of a parabola $y = k x^{2}$ (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire is now accelerated parallel to the x-axis with a constant acceleration a. The distance of the new equilibrium position of the bead, where the bead can stays at rest with respect to the wire, from the y-axis is

Discussion

9.	A sound signal is sent through a composite tube as shown in the figure. The radius of the semicircle is R and speed of sound in air is v. If 'n' is an integer, then the frequencies of the signal for obtaining maximum value of intensity are given by
Answer» A sound signal is sent through a composite tube as shown in the figure. The radius of the semicircle is $R$ and speed of sound in air is $v$ . If ' $n$ ' is an integer, then the frequencies of the signal for obtaining maximum value of intensity are given by

Discussion

10.	A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350ms−1. (a) By how much is the phase changed at a given point in 2.5 ms? (b) What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?
Answer» A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is $350 m s^{- 1}$ . (a) By how much is the phase changed at a given point in 2.5 ms? (b) What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?

Discussion

11.	A body starts moving with an initial velocity 50 m/s and acceleration 20 m/s2. How much distance it will cover in 4s ? Also, calculate its average speed during this time interval.
Answer» A body starts moving with an initial velocity 50 m/s and acceleration 20 $m / s^{2}$ . How much distance it will cover in 4s ? Also, calculate its average speed during this time interval.

Discussion

12.	A neutron mass 1.67×10−27kg moving with a velocity 1.2×107ms−1 collides head-on with a deuteron of mass 3.34×10−27kg initially at rest. If the collision is perfectly elastic,, what would be speed of deuteron after the collision?
Answer» A neutron mass $1.67 \times 10^{- 27} k g$ moving with a velocity $1.2 \times 10^{7} m s^{- 1}$ collides head-on with a deuteron of mass $3.34 \times 10^{- 27} k g$ initially at rest. If the collision is perfectly elastic,, what would be speed of deuteron after the collision?

Discussion

13.	A uniform metre scale of length 1 m is balanced on a fixed semi – circular cylinder of radius 30 cm as shown in figure. One end of the scale is slightly depressed and released. The time period (in seconds) of the resulting simple harmonic motion is (Takeg=10ms−2)
Answer» A uniform metre scale of length 1 m is balanced on a fixed semi – circular cylinder of radius 30 cm as shown in figure. One end of the scale is slightly depressed and released. The time period (in seconds) of the resulting simple harmonic motion is $(T a k e g = 10 m s^{- 2})$

Discussion

14.	Minimum force required to move a body of mass 10 kg on the rough floor of μ=1 is ________. Take √2=1.4
Answer» Minimum force required to move a body of mass $10 kg$ on the rough floor of $μ = 1$ is ________. Take $\sqrt{2} = 1.4$

Discussion

15.	A drop of water of volume V is pressed between the two glass plates so as to spread to an area A. If T is the surface tension, the normal force required to separate the glass plate is kTA2V,then k=___
Answer» A drop of water of volume V is pressed between the two glass plates so as to spread to an area A. If T is the surface tension, the normal force required to separate the glass plate is $\frac{k T A^{2}}{V}$ ,then k=___

Discussion

16.	A dipole consists of two particles one with charge +1 μC and mass 1 kg and the other with charge −1 μC and mass 2 kg separated by a distance of 3 m. For small oscillations about its equilibrium position, the angular frequency, when placed in a uniform electric field of 20 kV/m is
Answer» A dipole consists of two particles one with charge $+ 1 μ C$ and mass $1 kg$ and the other with charge $- 1 μ C$ and mass $2 kg$ separated by a distance of 3 m. For small oscillations about its equilibrium position, the angular frequency, when placed in a uniform electric field of $20 kV/m$ is

Discussion

17.	A particle of mass m, moves along the uniformly rough track PQR as shown in the figure. The coefficient of friction (μs=μk=μ), between the particle and the rough track is equal throughout the track. The particle is released from rest, from the point P and it comes to rest again at point R. The energy lost by the particle, over the parts PQ and QR of the track are equal and no energy is lost when the particle changes direction from PQ to QR. Then, values of the distance x=QR and coefficient of friction μ are respectively close to:
Answer» A particle of mass $m$ , moves along the uniformly rough track $P Q R$ as shown in the figure. The coefficient of friction ( $μ_{s} = μ_{k} = μ$ ), between the particle and the rough track is equal throughout the track. The particle is released from rest, from the point $P$ and it comes to rest again at point $R$ . The energy lost by the particle, over the parts $P Q$ and $Q R$ of the track are equal and no energy is lost when the particle changes direction from $P Q$ to $Q R$ . Then, values of the distance $x = Q R$ and coefficient of friction $μ$ are respectively close to:

Discussion

18.

A small disc of mass m is placed on a body of mass M at rest. If the disc is set in horizontal motion with velocity v as shown, (Assume that disc breaks from surface of M and all surfaces are smooth) Find the height to which disc rises after breaking at point A, from initial level.

Answer»

A small disc of mass

m

is placed on a body of mass

M

at rest. If the disc is set in horizontal motion with velocity

v

as shown,

(Assume that disc breaks from surface of

M

and all surfaces are smooth)
Find the height to which disc rises after breaking at point

A,

from initial level.

Discussion

19.	Three constant forces are applied on a body are given as −→F1=3^i N,−→F2=4^j N,−→F3=6^k N. If these forces displace the body by 5 m in negative y-axis direction from origin. Then total work done by the forces is
Answer» Three constant forces are applied on a body are given as $_{1} = 3^i N,_{2} = 4^j N,_{3} = 6^k N$ . If these forces displace the body by $5 m$ in negative $y$ -axis direction from origin. Then total work done by the forces is

Discussion

20.	When a mica sheet of thickness 7 microns and μ=1.6 is placed in the path of one of interfering beams in the YDSE, then the central fringe gets at the position of the seventh bright fringe. What is the wavelength of light used ?
Answer» When a mica sheet of thickness 7 microns and $μ = 1.6$ is placed in the path of one of interfering beams in the $Y D S E$ , then the central fringe gets at the position of the seventh bright fringe. What is the wavelength of light used ?

Discussion

21.	A man is capable of swimming at 10 m/s in still water. If he has to cross a river flowing at 5 m/s and reach the opposite shore in the least possible time, how far along the river will he drift if distance between the two shore is 100 m.
Answer» A man is capable of swimming at $10 m/s$ in still water. If he has to cross a river flowing at $5 m/s$ and reach the opposite shore in the least possible time, how far along the river will he drift if distance between the two shore is $100 m$ .

Discussion

22.	Which of the following graphs correctly represents a particle moving in a horizontal circle, if its magnitude of tangential acceleration is directly proportional to time and particle starts from rest?
Answer» Which of the following graphs correctly represents a particle moving in a horizontal circle, if its magnitude of tangential acceleration is directly proportional to time and particle starts from rest?

Discussion

23.	The system shown in the figure is in equilibrium. Find the accelerations of the blocks A, B and C just after the string between A and B is cut. All blocks are of equal masses ‘m’ each and springs are of equal stiffness. (Assume springs to be ideal and take downward acceleration to be positive).
Answer» The system shown in the figure is in equilibrium. Find the accelerations of the blocks A, B and C just after the string between A and B is cut. All blocks are of equal masses ‘ $m$ ’ each and springs are of equal stiffness. (Assume springs to be ideal and take downward acceleration to be positive).

Discussion

24.	A satellite of mass 500 kg revolves around the earth in a circular path. If the distance between the satellite and the centre of the earth is 30000 km, find the gravitational force exerted by the earth on the satellite.
Answer» A satellite of mass 500 kg revolves around the earth in a circular path. If the distance between the satellite and the centre of the earth is 30000 km, find the gravitational force exerted by the earth on the satellite.

Discussion

25.	A small mass starts sliding down a fixed inclined plane of inclination 45∘ with the horizontal. The coefficient of friction is μ=μ0x where x is the distance through which the mass slides down and μ0 is a constant. Find the distance covered by the mass along the inclined plane before it stops.
Answer» A small mass starts sliding down a fixed inclined plane of inclination $45^{\circ}$ with the horizontal. The coefficient of friction is $μ = μ_{0} x$ where $x$ is the distance through which the mass slides down and $μ_{0}$ is a constant. Find the distance covered by the mass along the inclined plane before it stops.

Discussion

26.	Calculate the pressure exerted by the waters of the Bay of Bengal near Puducherry (density = 1025 kg/m3) at a depth of 11.0 Km.
Answer» Calculate the pressure exerted by the waters of the Bay of Bengal near Puducherry (density = 1025 kg/m3) at a depth of 11.0 Km.

Discussion

27.	The plane 2x–3y+6z–11=0 makes an angle sin–1(α) with the x-axis. Then the value of α is (a) 17 (b) 27(c) 37 (d) 67
Answer» The plane $2 x - 3 y + 6 z - 11 = 0$ makes an angle ${sin}^{- 1} (α)$ with the x-axis. Then the value of $α$ is $(a) \frac{1}{7} (b) \frac{2}{7} (c) \frac{3}{7} (d) \frac{6}{7}$

Discussion

28.	The numeric value of pv vc/RTc is equal to (1) 8/3. (2) 3/8 (3) 2/8. (4) 8/2
Answer» The numeric value of p_vv_c/RT_{c is equal to (1) 8/3. (2) 3/8 (3) 2/8. (4) 8/2}

Discussion

29.	how does the nature of material affect the air resistance acting on it?
Answer» how does the nature of material affect the air resistance acting on it?

Discussion

30.	At a height of 0.4 m from the ground, the velocity of a projectile is →v=(6^i+2^j) m/s . The angle of projection is (g=10 m/s2 ).
Answer» At a height of $0.4 m$ from the ground, the velocity of a projectile is $\to v = (6^i + 2^j) m/s$ . The angle of projection is ( $g = 10 {m/s}^{2}$ ).

Discussion

31.	The maximum velocity (in ms–1) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is
Answer» The maximum velocity (in $m s^{- 1}$ ) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is

Discussion

32.	A flywheel rotates at a costant speed of 3000 rpm. How much time will it take to describe the angle of 100π rad?
Answer» A flywheel rotates at a costant speed of $3000$ rpm. How much time will it take to describe the angle of 100 $π$ rad?

Discussion

33.	A large elevator is sliding on a wedge of angle θ. What will be the range of a projectile in this frame, if it is projected at an angle α
Answer» A large elevator is sliding on a wedge of angle $θ$ . What will be the range of a projectile in this frame, if it is projected at an angle $α$

Discussion

34.	A balloon filled with an ideal gas is taken from the surface of the sea to the depth of 100m. What will be the volume in terms of its original volume?
Answer» A balloon filled with an ideal gas is taken from the surface of the sea to the depth of 100m. What will be the volume in terms of its original volume?

Discussion

35.	A hall has the dimensions 10 m×12 m×14 m. Taking one corner as the origin . A fly starting from origin ends up at a diagonally opposite corner. Then calculate the magnitude of the position vector of fly.
Answer» A hall has the dimensions $10 m \times 12 m \times 14 m$ . Taking one corner as the origin . A fly starting from origin ends up at a diagonally opposite corner. Then calculate the magnitude of the position vector of fly.

Discussion

36.	Which law states that 'to kill and to be killed, to grow and to die and get decomposed'?
Answer» Which law states that 'to kill and to be killed, to grow and to die and get decomposed'?

Discussion

37.	From a uniform circular disc of radius R and mass 9M, a small disc of radius R3 is removed as shown in the figure. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through centre of disc is. (Given that moment of inertia of removed portion about the given axis is MR2/2)
Answer» From a uniform circular disc of radius R and mass $9 M$ , a small disc of radius $\frac{R}{3}$ is removed as shown in the figure. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through centre of disc is. (Given that moment of inertia of removed portion about the given axis is $M R^{2} / 2$ )

Discussion

38.	A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant the bullet leaves the barrel of the gun, the monkey drops. Will the bullet hit the monkey? Substantiate (give proper evidence to prove the truth of) your answer with proper reasoning.
Answer» A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant the bullet leaves the barrel of the gun, the monkey drops. Will the bullet hit the monkey? Substantiate (give proper evidence to prove the truth of) your answer with proper reasoning.

Discussion

39.	The potential energy of a strained body comes out to be ½ x stress x strain x volume. Can you derive this relation?
Answer» The potential energy of a strained body comes out to be ½ x stress x strain x volume. Can you derive this relation?

Discussion

40.	(1) DEFINE THESE IN SHORT A. CHARGING BY INDUTION B. CHARGING BY CONDUTION C. COULOMB LAW D. ELECTRIC FIELD E. ELECTRIC FLUX F. ELECTRIC DIPOLE G. GAUSS LAW
Answer» (1) DEFINE THESE IN SHORT A. CHARGING BY INDUTION B. CHARGING BY CONDUTION C. COULOMB LAW D. ELECTRIC FIELD E. ELECTRIC FLUX F. ELECTRIC DIPOLE G. GAUSS LAW

40.

(1) DEFINE THESE IN SHORT A. CHARGING BY INDUTION B. CHARGING BY CONDUTION C. COULOMB LAW D. ELECTRIC FIELD E. ELECTRIC FLUX F. ELECTRIC DIPOLE G. GAUSS LAW

Answer»

(1) DEFINE THESE IN SHORT

A. CHARGING BY INDUTION

B. CHARGING BY CONDUTION

C. COULOMB LAW

D. ELECTRIC FIELD

E. ELECTRIC FLUX

F. ELECTRIC DIPOLE

G. GAUSS LAW

Discussion

41.	Two point charges -q and +q are located at points (0,0, -a) and (0,0,a) respectivley. What is the electric potential at point (0,0, z)? (z > a)
Answer» Two point charges -q and +q are located at points (0,0, -a) and (0,0,a) respectivley. What is the electric potential at point (0,0, z)? (z > a)

Discussion

42.	If a body travels half of its path in the last second of its fall from rest; find the time and height of its fall?
Answer» If a body travels half of its path in the last second of its fall from rest; find the time and height of its fall?

Discussion

43.	A person travelling in a straight line moves with a constant velocity 10 m/s for a distance of 100 m and with a constant velocity of 15 m/s for the next equal distance. The average velocity of the motion (in m/s) is
Answer» A person travelling in a straight line moves with a constant velocity $10 m/s$ for a distance of $100 m$ and with a constant velocity of $15 m/s$ for the next equal distance. The average velocity of the motion (in $m/s$ ) is

Discussion

44.	A thin rod MN, free to rotate in the vertical plane about the fixed end N, is held in a horizontal position. If the rod is released from this position, speed of end M when the rod makes an angle α with the horizontal will be proportional to
Answer» A thin rod $MN$ , free to rotate in the vertical plane about the fixed end $N$ , is held in a horizontal position. If the rod is released from this position, speed of end $M$ when the rod makes an angle $α$ with the horizontal will be proportional to

Discussion

45.	An α-particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de Broglie wavelengths are λα and λp, respectively. The ratio λp/λα, to the nearest integer, is ___
Answer» An $α$ -particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de Broglie wavelengths are $λ_{α} a n d λ_{p}$ , respectively. The ratio $λ_{p} / λ_{α},$ to the nearest integer, is ___

Discussion

46.	In SHM, for how many times potential energy is equal to kinetic energy during one complete period?
Answer» In SHM, for how many times potential energy is equal to kinetic energy during one complete period?

Discussion

47.	When two sound waves with a phase difference of π2, and each having amplitude A and frequency ω, are superimposed on each other, then the maximum amplitude and frequency of resultant wave is [MP PMT 1989]
Answer» When two sound waves with a phase difference of $\frac{π}{2}$ , and each having amplitude A and frequency ω, are superimposed on each other, then the maximum amplitude and frequency of resultant wave is [MP PMT 1989]

Discussion

48.	Define the term wave front. State Huygen's principle. Consider a plane wave front incident on a thin convex lens. Draw a proper diagram to show how the incident wave front traverses through the lens and after refraction focuses on the focal point of the lens, giving the shape of the emergent wave front.
Answer» Define the term wave front. State Huygen's principle. Consider a plane wave front incident on a thin convex lens. Draw a proper diagram to show how the incident wave front traverses through the lens and after refraction focuses on the focal point of the lens, giving the shape of the emergent wave front.

Discussion

49.	Define self-inductance of a coil. Obtain the expression for the energy stored in an inductor L connected across a source of emf.
Answer» Define self-inductance of a coil. Obtain the expression for the energy stored in an inductor L connected across a source of emf.

Discussion

50.	The force between two charges 0.06m apart is 5N. If each charge is moved towards the other by 0.01m, then the force between them will become
Answer» The force between two charges 0.06m apart is 5N. If each charge is moved towards the other by 0.01m, then the force between them will become

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The magnitude of saturation photoelectric current depends upon

Four particles of masses m, 2m, 3m and 4m are kept in sequence at the corners of a square of side a. The magnitude of gravitational force acting on a particle of mass m placed at the centre of the square will be

At any instant the ratio of the amount of radioactive substances is 3 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances

One mole of a monoatomic gas is heated using PV32=const. Find the amount of heat obtained in the process, when the temperature changes by ΔT=−26 K

A sound signal is sent through a composite tube as shown in the figure. The radius of the semicircle is R and speed of sound in air is v. If 'n' is an integer, then the frequencies of the signal for obtaining maximum value of intensity are given by

A body starts moving with an initial velocity 50 m/s and acceleration 20 m/s2. How much distance it will cover in 4s ? Also, calculate its average speed during this time interval.

A neutron mass 1.67×10−27kg moving with a velocity 1.2×107ms−1 collides head-on with a deuteron of mass 3.34×10−27kg initially at rest. If the collision is perfectly elastic,, what would be speed of deuteron after the collision?

A uniform metre scale of length 1 m is balanced on a fixed semi – circular cylinder of radius 30 cm as shown in figure. One end of the scale is slightly depressed and released. The time period (in seconds) of the resulting simple harmonic motion is (Takeg=10ms−2)

Minimum force required to move a body of mass 10 kg on the rough floor of μ=1 is ________. Take √2=1.4

A drop of water of volume V is pressed between the two glass plates so as to spread to an area A. If T is the surface tension, the normal force required to separate the glass plate is kTA2V,then k=___

A dipole consists of two particles one with charge +1 μC and mass 1 kg and the other with charge −1 μC and mass 2 kg separated by a distance of 3 m. For small oscillations about its equilibrium position, the angular frequency, when placed in a uniform electric field of 20 kV/m is

A small disc of mass m is placed on a body of mass M at rest. If the disc is set in horizontal motion with velocity v as shown, (Assume that disc breaks from surface of M and all surfaces are smooth) Find the height to which disc rises after breaking at point A, from initial level.

Three constant forces are applied on a body are given as −→F1=3^i N,−→F2=4^j N,−→F3=6^k N. If these forces displace the body by 5 m in negative y-axis direction from origin. Then total work done by the forces is

When a mica sheet of thickness 7 microns and μ=1.6 is placed in the path of one of interfering beams in the YDSE, then the central fringe gets at the position of the seventh bright fringe. What is the wavelength of light used ?

A man is capable of swimming at 10 m/s in still water. If he has to cross a river flowing at 5 m/s and reach the opposite shore in the least possible time, how far along the river will he drift if distance between the two shore is 100 m.

Which of the following graphs correctly represents a particle moving in a horizontal circle, if its magnitude of tangential acceleration is directly proportional to time and particle starts from rest?

The system shown in the figure is in equilibrium. Find the accelerations of the blocks A, B and C just after the string between A and B is cut. All blocks are of equal masses ‘m’ each and springs are of equal stiffness. (Assume springs to be ideal and take downward acceleration to be positive).

A satellite of mass 500 kg revolves around the earth in a circular path. If the distance between the satellite and the centre of the earth is 30000 km, find the gravitational force exerted by the earth on the satellite.

A small mass starts sliding down a fixed inclined plane of inclination 45∘ with the horizontal. The coefficient of friction is μ=μ0x where x is the distance through which the mass slides down and μ0 is a constant. Find the distance covered by the mass along the inclined plane before it stops.

Calculate the pressure exerted by the waters of the Bay of Bengal near Puducherry (density = 1025 kg/m3) at a depth of 11.0 Km.

The plane 2x–3y+6z–11=0 makes an angle sin–1(α) with the x-axis. Then the value of α is (a) 17 (b) 27(c) 37 (d) 67

The numeric value of p​​​v v​​​​​​c/RT​​​​​c is equal to (1) 8/3. (2) 3/8 (3) 2/8. (4) 8/2

how does the nature of material affect the air resistance acting on it?

At a height of 0.4 m from the ground, the velocity of a projectile is →v=(6^i+2^j) m/s . The angle of projection is (g=10 m/s2 ).

The maximum velocity (in ms–1) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is

A flywheel rotates at a costant speed of 3000 rpm. How much time will it take to describe the angle of 100π rad?

A large elevator is sliding on a wedge of angle θ. What will be the range of a projectile in this frame, if it is projected at an angle α

A balloon filled with an ideal gas is taken from the surface of the sea to the depth of 100m. What will be the volume in terms of its original volume?

A hall has the dimensions 10 m×12 m×14 m. Taking one corner as the origin . A fly starting from origin ends up at a diagonally opposite corner. Then calculate the magnitude of the position vector of fly.

Which law states that 'to kill and to be killed, to grow and to die and get decomposed'?

A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant the bullet leaves the barrel of the gun, the monkey drops. Will the bullet hit the monkey? Substantiate (give proper evidence to prove the truth of) your answer with proper reasoning.

The potential energy of a strained body comes out to be ½ x stress x strain x volume. Can you derive this relation?

(1) DEFINE THESE IN SHORT A. CHARGING BY INDUTION B. CHARGING BY CONDUTION C. COULOMB LAW D. ELECTRIC FIELD E. ELECTRIC FLUX F. ELECTRIC DIPOLE G. GAUSS LAW

Two point charges -q and +q are located at points (0,0, -a) and (0,0,a) respectivley. What is the electric potential at point (0,0, z)? (z &gt; a)

If a body travels half of its path in the last second of its fall from rest; find the time and height of its fall?

A person travelling in a straight line moves with a constant velocity 10 m/s for a distance of 100 m and with a constant velocity of 15 m/s for the next equal distance. The average velocity of the motion (in m/s) is

A thin rod MN, free to rotate in the vertical plane about the fixed end N, is held in a horizontal position. If the rod is released from this position, speed of end M when the rod makes an angle α with the horizontal will be proportional to

An α-particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de Broglie wavelengths are λα and λp, respectively. The ratio λp/λα, to the nearest integer, is ___

In SHM, for how many times potential energy is equal to kinetic energy during one complete period?

When two sound waves with a phase difference of π2, and each having amplitude A and frequency ω, are superimposed on each other, then the maximum amplitude and frequency of resultant wave is [MP PMT 1989]

Define self-inductance of a coil. Obtain the expression for the energy stored in an inductor L connected across a source of emf.

The force between two charges 0.06m apart is 5N. If each charge is moved towards the other by 0.01m, then the force between them will become

The numeric value of pv vc/RTc is equal to (1) 8/3. (2) 3/8 (3) 2/8. (4) 8/2

Two point charges -q and +q are located at points (0,0, -a) and (0,0,a) respectivley. What is the electric potential at point (0,0, z)? (z > a)