50278 + Interview Questions in Physics

1.	A stone of mass m tied to a string of length l is rotating along a circular path with constant speed v. The torque on the stone is
Answer» A stone of mass m tied to a string of length l is rotating along a circular path with constant speed v. The torque on the stone is

Discussion

2.	If a body of mass m is raised to a height 2h above the earth’s surface, the gain in potential energy is
Answer» If a body of mass m is raised to a height 2h above the earth’s surface, the gain in potential energy is

Discussion

3.	A metal disk with a charge Q1=−1e is placed near a metal sphere that has a charge Q2=−4e. If the disk touched the sphere, what is the possible final charge on each object?
Answer» A metal disk with a charge $Q_{1} = - 1 e$ is placed near a metal sphere that has a charge $Q_{2} = - 4 e$ . If the disk touched the sphere, what is the possible final charge on each object?

Discussion

4.	An inclined plane makes an angle of 30∘ with the horizontal. A solid sphere rolling down this inclined plane from rest without slipping has a linear acceleration equal to 5gn, then value of n is
Answer» An inclined plane makes an angle of $30^{\circ}$ with the horizontal. A solid sphere rolling down this inclined plane from rest without slipping has a linear acceleration equal to $\frac{5 g}{n}$ , then value of $n$ is

Discussion

5.	Question 39In what way is Rutherford's atomic model different from that of Thomson's atomic model?
Answer» Question 39 In what way is Rutherford's atomic model different from that of Thomson's atomic model?

Discussion

6.	Moment of inertia of a disc about an axis which is tangentand parallel to its plane is I. Then, the moment of inertia ofdisc about a tangent, but perpendicular to its plane will be
Answer» Moment of inertia of a disc about an axis which is tangentand parallel to its plane is I. Then, the moment of inertia ofdisc about a tangent, but perpendicular to its plane will be

Discussion

7.	52.Calculate the debroglie wavelength of the electron orbiting in the n=2 states of hydrogen atom
Answer» 52.Calculate the debroglie wavelength of the electron orbiting in the n=2 states of hydrogen atom

Discussion

8.	Consider the Zener voltage regulator shown in the figure below:If the value of zener voltage is 5V then for the minimum value of RL for which Zener diode will be in breakdown is equal to ______kΩ. 2.5
Answer» Consider the Zener voltage regulator shown in the figure below: If the value of zener voltage is 5V then for the minimum value of $R_{L}$ for which Zener diode will be in breakdown is equal to ______ $k Ω .$ 2.5

Discussion

9.	mean value of valtage for full cycle for ac current?
Answer» mean value of valtage for full cycle for ac current?

Discussion

10.	Which product is obtained at anode on electrolysis of aqueous solution of sodium acetate?
Answer» Which product is obtained at anode on electrolysis of aqueous solution of sodium acetate?

Discussion

11.	If a radioactive sample emits n beta particles in t second and emits 0.75n beta particles in next t second. Find mea life of sample.
Answer» If a radioactive sample emits n beta particles in t second and emits 0.75n beta particles in next t second. Find mea life of sample.

Discussion

12.	A ball is dropped along smooth inclined surfaces AB,AC and AD. The velocity acquired at B,C,D be vB,vC and vD respectively. Then
Answer» A ball is dropped along smooth inclined surfaces $A B, A C$ and $A D$ . The velocity acquired at $B, C, D$ be $v_{B}, v_{C}$ and $v_{D}$ respectively. Then

Discussion

13.	The resistance of a wire is R Ω . If it is melted and stretched to n times its original length, its new resistance will be
Answer» The resistance of a wire is $R Ω$ . If it is melted and stretched to $n$ times its original length, its new resistance will be

Discussion

14.	How NO2 is paramagnetic
Answer» How NO2 is paramagnetic

Discussion

15.	The coefficient of static friction between a block of mass m and an incline is μs = 0.3. What can be the maximum angle θ of the incline with the horizontal so that the block does not slip on the plane? (Also called angle of repose)
Answer» The coefficient of static friction between a block of mass m and an incline is $μ_{s}$ = 0.3. What can be the maximum angle θ of the incline with the horizontal so that the block does not slip on the plane? (Also called angle of repose)

Discussion

16.	A bimetallic strip is formed out of two identical strips one of copper and the other of brass. The co-efficients of linear expansion of the two metals are aC and aB. On heating, the temperature of the strip goes DT and the strip bends to form an arc of radius of curvature R. Then R is
Answer» A bimetallic strip is formed out of two identical strips one of copper and the other of brass. The co-efficients of linear expansion of the two metals are $a_{C}$ and $a_{B}$ . On heating, the temperature of the strip goes $D_{T}$ and the strip bends to form an arc of radius of curvature R. Then R is

Discussion

17.	A source of sound is travelling with a velocity of 30 m/s towards a stationary observer. If actual frequency of the source is 800 Hz and the wind is blowing with velocity 10 m/s in a direction making an angle 60∘ with the direction of motion of the source, then the apparent frequency heard by the observer is:(speed of sound in still air is 340 m/s)
Answer» A source of sound is travelling with a velocity of $30 m/s$ towards a stationary observer. If actual frequency of the source is $800 Hz$ and the wind is blowing with velocity $10 m/s$ in a direction making an angle $60^{\circ}$ with the direction of motion of the source, then the apparent frequency heard by the observer is: (speed of sound in still air is $340 m/s$ )

Discussion

18.	6. A tuning fork and an air column whose temperature is 51�C produce 4 beats in one second, when sounded together. When the temperature of air column decrease the number of beats per second decrease. When the temperature remains 16�C only one beat per second is produced. The frequency of the tuning fork is 1) 100HZ 2) 75 Hz 3) 150Hz 4) 50Hz
Answer» 6. A tuning fork and an air column whose temperature is 51�C produce 4 beats in one second, when sounded together. When the temperature of air column decrease the number of beats per second decrease. When the temperature remains 16�C only one beat per second is produced. The frequency of the tuning fork is 1) 100HZ 2) 75 Hz 3) 150Hz 4) 50Hz

Discussion

19.	MOI of a circular ring of radius R about the line passing through its centre of mass in the plane of circle is I. Find the MOI of ring about a line passing through its COM and perpendicular to its plane.
Answer» $MOI$ of a circular ring of radius $R$ about the line passing through its centre of mass in the plane of circle is $I$ . Find the $MOI$ of ring about a line passing through its $COM$ and perpendicular to its plane.

Discussion

20.	In a two dimensional motion of particle, the particle moves from point Α, position vector →r1 to point B, position vector →r2. If the magnitudes of these vectors are, respectively r1=3 and r2=4, and the angles they make with the x- axis are θ1=750and θ2=150, and respectively, then find the magnitude of the displacement vector.
Answer» In a two dimensional motion of particle, the particle moves from point Α, position vector ${\to r}_{1}$ to point B, position vector ${\to r}_{2}$ . If the magnitudes of these vectors are, respectively $r_{1} = 3 a n d r_{2} = 4$ , and the angles they make with the x- axis are $θ_{1} = 75^{0} a n d θ_{2} = 15^{0},$ and respectively, then find the magnitude of the displacement vector.

20.

In a two dimensional motion of particle, the particle moves from point Α, position vector →r1 to point B, position vector →r2. If the magnitudes of these vectors are, respectively r1=3 and r2=4, and the angles they make with the x- axis are θ1=750and θ2=150, and respectively, then find the magnitude of the displacement vector.

Answer»

In a two dimensional motion of particle, the particle moves from point Α, position vector ${\to r}_{1}$ to point B, position vector ${\to r}_{2}$ . If the magnitudes of these vectors are, respectively $r_{1} = 3 a n d r_{2} = 4$ , and the angles they make with the x- axis are $θ_{1} = 75^{0} a n d θ_{2} = 15^{0},$ and respectively, then find the magnitude of the displacement vector.

Discussion

21.	The velocity of water in a river is 18 km h-1 near the surface. If the river is 5 m deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water = 10-2 poise.
Answer» The velocity of water in a river is 18 km h^-1 near the surface. If the river is 5 m deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water = 10^-2 poise.

Discussion

22.	A uniform magnetic field →B=(20^i−30^j+50^k) T exists in the space. A charge particle with specific charge 10319 C/kg enters this region at time t=0 with a velocity →v=(20^i+50^j+30^k) m/s. The pitch of the helical path for the motion of the charged particle will be:
Answer» A uniform magnetic field $\to B = (20^i - 30^j + 50^k) T$ exists in the space. A charge particle with specific charge $\frac{10^{3}}{19} C/kg$ enters this region at time $t = 0$ with a velocity $\to v = (20^i + 50^j + 30^k) m/s$ . The pitch of the helical path for the motion of the charged particle will be:

Discussion

23.	ntThere is an electric field E in x- direction . If work done in moving a charge .2 C through a distance of 2m along a line making an angle 60 degree with X - axis is 4 joule , what is the value of E?n ntn
Answer» ntThere is an electric field E in x- direction . If work done in moving a charge .2 C through a distance of 2m along a line making an angle 60 degree with X - axis is 4 joule , what is the value of E?n ntn

Discussion

24.	A thin circular plate of radius 1 m has its density varying as ρ(r)=8r where r is the distance from its geometrical centre. Find the moment of inertia of the circular plate about an axis passing through its edge and perpendicular to the plate.
Answer» A thin circular plate of radius $1 m$ has its density varying as $ρ (r) = 8 r$ where $r$ is the distance from its geometrical centre. Find the moment of inertia of the circular plate about an axis passing through its edge and perpendicular to the plate.

Discussion

25.	Use the following information to answer the next question. There are four mirrors labelled as I, II, III, and IV. Mirrors I and IV can form virtual and small images only. Mirror III can form an image that can be obtained on a screen. Mirror II cannot form real images of objects. Which of the given mirrors can form an inverted image of the object?
Answer» Use the following information to answer the next question. There are four mirrors labelled as I, II, III, and IV. Mirrors I and IV can form virtual and small images only. Mirror III can form an image that can be obtained on a screen. Mirror II cannot form real images of objects. Which of the given mirrors can form an inverted image of the object?

25.

Use the following information to answer the next question. There are four mirrors labelled as I, II, III, and IV. Mirrors I and IV can form virtual and small images only. Mirror III can form an image that can be obtained on a screen. Mirror II cannot form real images of objects. Which of the given mirrors can form an inverted image of the object?

Answer»

Use the following information to answer the next question.

There are four mirrors labelled as I, II, III, and IV. Mirrors I and IV can form virtual and small images only. Mirror III can form an image that can be obtained on a screen. Mirror II cannot form real images of objects.

Which of the given mirrors can form an inverted image of the object?

Discussion

26.	The two ends of a uniform thin rod of length √2R and of mass 2 kg can move without friction along a vertical circular path of radius R. The rod is released from the vertical position (ab). The force (in N) exerted by an end of the rod on the path when the rod passes the horizontal position (cd) is 10x√2 . Then x is ( Neglect the distance between b and c) ___
Answer» The two ends of a uniform thin rod of length $\sqrt{2} R$ and of mass 2 kg can move without friction along a vertical circular path of radius R. The rod is released from the vertical position (ab). The force (in N) exerted by an end of the rod on the path when the rod passes the horizontal position (cd) is $\frac{10 x}{\sqrt{2}}$ . Then x is ( Neglect the distance between b and c) ___

26.

The two ends of a uniform thin rod of length √2R and of mass 2 kg can move without friction along a vertical circular path of radius R. The rod is released from the vertical position (ab). The force (in N) exerted by an end of the rod on the path when the rod passes the horizontal position (cd) is 10x√2 . Then x is ( Neglect the distance between b and c) ___

Answer»

The two ends of a uniform thin rod of length $\sqrt{2} R$ and of mass 2 kg can move without friction along a vertical circular path of radius R. The rod is released from the vertical position (ab). The force (in N) exerted by an end of the rod on the path when the rod passes the horizontal position (cd) is $\frac{10 x}{\sqrt{2}}$ . Then x is ( Neglect the distance between b and c)

___

Discussion

27.	A parallel plate capacitor with plate separation d , is half filled with a dielectric of dielectric constant k and mass M. Capacitor is attached with a cell of emf E. The plates are held fixed on smooth insulating horizontally surface. A bullet of mass M hits the dielectric elastically and it is found that dielectric just leaves out the capacitor. The speed of bullet is:
Answer» A parallel plate capacitor with plate separation $d$ , is half filled with a dielectric of dielectric constant $k$ and mass $M$ . Capacitor is attached with a cell of emf $E$ . The plates are held fixed on smooth insulating horizontally surface. A bullet of mass $M$ hits the dielectric elastically and it is found that dielectric just leaves out the capacitor. The speed of bullet is:

Discussion

28.	Nh3 me h- bond
Answer» Nh3 me h- bond

Discussion

29.	Two containers of equal volume contain the same gas at different pressures P1 and P2 and absolute temperatures T1 and T2, respectively. On joining the vessels, the gas reaches a common pressure P and common temperature T. The ratio PT is equal to
Answer» Two containers of equal volume contain the same gas at different pressures $P_{1}$ and $P_{2}$ and absolute temperatures $T_{1}$ and $T_{2}$ , respectively. On joining the vessels, the gas reaches a common pressure $P$ and common temperature $T$ . The ratio $\frac{P}{T}$ is equal to

Discussion

30.	A man measures the time period of a simple pendulum inside a stationary lift and finds it to be 10 sec. If the lift accelerates upwards with an acceleration g4, then find the time period of the pendulum.
Answer» A man measures the time period of a simple pendulum inside a stationary lift and finds it to be $10 sec$ . If the lift accelerates upwards with an acceleration $\frac{g}{4}$ , then find the time period of the pendulum.

Discussion

31.	The driver of train A moving at a constant speed of 30m/s sees another train B moving on the track at a speed of 10m/s in the same direction. He immediately applies break and achieves a uniform retardation of 3m/s2. To avoid collision, what must be the minimum distance between the trains?
Answer» The driver of train A moving at a constant speed of $30 m / s$ sees another train B moving on the track at a speed of $10 m / s$ in the same direction. He immediately applies break and achieves a uniform retardation of 3m/s². To avoid collision, what must be the minimum distance between the trains?

Discussion

32.	28. Two masses m, 1 kg and m2 0.5 kg are suspended together by a massless spring of spring constant 12.5 Nm-1. When masses are in equilibrium m, is removed without disturbing the system. New amplitude of oscillation will be (1) 30 cm (3) 80 cm (2) 50 cm (4) 60 cm
Answer» 28. Two masses m, 1 kg and m2 0.5 kg are suspended together by a massless spring of spring constant 12.5 Nm-1. When masses are in equilibrium m, is removed without disturbing the system. New amplitude of oscillation will be (1) 30 cm (3) 80 cm (2) 50 cm (4) 60 cm

Discussion

33.	A particle having mass m is projected with a velocity v0 from a point P on a horizontal ground making an angle θ with horizontal. Find out the torque about the point of projection acting on the particle when it is at its maximum height?
Answer» A particle having mass $m$ is projected with a velocity $v_{0}$ from a point $P$ on a horizontal ground making an angle $θ$ with horizontal. Find out the torque about the point of projection acting on the particle when it is at its maximum height?

33.

A particle having mass m is projected with a velocity v0 from a point P on a horizontal ground making an angle θ with horizontal. Find out the torque about the point of projection acting on the particle when it is at its maximum height?

Answer»

A particle having mass $m$ is projected with a velocity $v_{0}$ from a point $P$ on a horizontal ground making an angle $θ$ with horizontal. Find out the torque about the point of projection acting on the particle when it is at its maximum height?

Discussion

34.	You are given two converging lenses of focal lengths, 1.5 cm and 4 cm to design a compound microscope. If it is desired to have a magnifying power of 50, in case of normal adjustment, then find out the separation between the objective lens and the eyepiece.
Answer» You are given two converging lenses of focal lengths, $1.5 cm$ and $4 cm$ to design a compound microscope. If it is desired to have a magnifying power of $50$ , in case of normal adjustment, then find out the separation between the objective lens and the eyepiece.

Discussion

35.	Potential energy of a particle of mass 2 kg of plating on x-axis is given by U=(k-x)^2-10 the total energy of oscillation is 26 find the maximum speed of particle Why here (k-x)^2 is taken kE
Answer» Potential energy of a particle of mass 2 kg of plating on x-axis is given by U=(k-x)^2-10 the total energy of oscillation is 26 find the maximum speed of particle Why here (k-x)^2 is taken kE

Discussion

36.	A man of mass 50kg is walking on a long wooden board of mass 200kg (as shown in the figure). The wooden board is initially at rest on a frictionless ice surface. If the man walks with a velocity of V=1ms in the positive x direction relative to the wooden board. find the velocity of the board in ms Velocity is positive in the positive x direction_______0.2
Answer» A man of mass $50 k g$ is walking on a long wooden board of mass $200 k g$ (as shown in the figure). The wooden board is initially at rest on a frictionless ice surface. If the man walks with a velocity of $V = 1 \frac{m}{s}$ in the positive $x$ direction relative to the wooden board. find the velocity of the board in $\frac{m}{s}$ Velocity is positive in the positive x direction_______ 0.2

Discussion

37.	12 g of an alkaline earth metal gives 14.8 g of its hidride. Atomic weight of the metal is (1) 12 (2) 20 (3) 40 (4) 14.
Answer» 12 g of an alkaline earth metal gives 14.8 g of its hidride. Atomic weight of the metal is (1) 12 (2) 20 (3) 40 (4) 14.

Discussion

38.	For the given electric field lines configurations, which of the following charge has greater magnitude?
Answer» For the given electric field lines configurations, which of the following charge has greater magnitude?

Discussion

39.	When a resistance of 2 ohms is connected across the terminals of a cell,the current is 0.5 A. When the resistance is increased to 5 ohms,the current becomes 0.25 A. the internal resistance of the cell is
Answer» When a resistance of 2 ohms is connected across the terminals of a cell,the current is 0.5 A. When the resistance is increased to 5 ohms,the current becomes 0.25 A. the internal resistance of the cell is

Discussion

40.	Let →a,→b and →c be three unit vectors such that ∣∣∣→a−→b∣∣∣2+∣∣→a−→c∣∣2=8.Then ∣∣∣→a+2→b∣∣∣2+∣∣→a+2→c∣∣2 is equal to:
Answer» Let $\to a, \to b$ and $\to c$ be three unit vectors such that ${∣ ∣ ∣ \to a - \to b ∣ ∣ ∣}^{2} + {∣ ∣ \to a - \to c ∣ ∣}^{2} = 8.$ Then ${∣ ∣ ∣ \to a + 2 \to b ∣ ∣ ∣}^{2} + {∣ ∣ \to a + 2 \to c ∣ ∣}^{2}$ is equal to:

Discussion

41.	A cricketer can throw a ball toa maximum horizontal distance of 100 m. How high above the ground can thecricketer throw the ball, with the same speed?
Answer» A cricketer can throw a ball toa maximum horizontal distance of 100 m. How high above the ground can thecricketer throw the ball, with the same speed?

Discussion

42.	A body of mass 5 kg falls from a height of 30 M if its all mechanical energy is changed into heat then heat produced will be
Answer» A body of mass 5 kg falls from a height of 30 M if its all mechanical energy is changed into heat then heat produced will be

Discussion

43.	A simple pendulum is hanged in a cart and cart issliding on inclined plane of inclination 60^° , withhorizontal. If friction has no role, then time periodof oscillation will be (here, I is length of simple81(1) 2u(2)3/(4) 2g2131
Answer» A simple pendulum is hanged in a cart and cart is sliding on inclined plane of inclination 60^° , with horizontal. If friction has no role, then time period of oscillation will be (here, I is length of simple 81 (1) 2u (2) 3/ (4) 2g 21 31

Discussion

44.	27. Electric field intensity at point B due to the point charge Q kept at point A is 24N/C and the electric potential at point B due to same is 12J/C calculate the distance AB and also the magnitude of charge Q.
Answer» 27. Electric field intensity at point B due to the point charge Q kept at point A is 24N/C and the electric potential at point B due to same is 12J/C calculate the distance AB and also the magnitude of charge Q.

Discussion

45.	In a rectangle ABCD where A is origin as shown in the figure, what is −−→AB+−−→AD ?
Answer» In a rectangle $A B C D$ where $A$ is origin as shown in the figure, what is $- - \to A B + - - \to A D$ ?

Discussion

46.	The kinetic energy of a projectile at the highest point of it projection is 75% of its kinetic energy at the point of projection. Find the angle of projection.
Answer» The kinetic energy of a projectile at the highest point of it projection is $75$ % of its kinetic energy at the point of projection. Find the angle of projection.

Discussion

47.	Two uniform rods AB and BC have Young's modulii 1.2×1011 N/m2 and 1.5×1011 N/m2 respectively. If coefficient of linear expansion of AB is 1.5×10−5/ ∘C and both have equal area of cross section, then coefficient of linear expansion of BC, for which there is no shift of the junction at all temperatures, is
Answer» Two uniform rods $A B$ and $B C$ have Young's modulii $1.2 \times 10^{11} {N/m}^{2}$ and $1.5 \times 10^{11} {N/m}^{2}$ respectively. If coefficient of linear expansion of $A B$ is $1.5 \times 10^{- 5} /^{\circ} C$ and both have equal area of cross section, then coefficient of linear expansion of $B C$ , for which there is no shift of the junction at all temperatures, is

Discussion

48.	{ †ext { According to Coulomb's law the atom should disintegrate because of repulsion between protons but } } { †ext { this doesn't happen, why? }
Answer» { †ext { According to Coulomb's law the atom should disintegrate because of repulsion between protons but } } { †ext { this doesn't happen, why? }

Discussion

49.	A man at rest observes that rain is falling with the velocity of 20 m/s at an angle 30^° with the vertical. The velocity with which the man should move on a horizontal road, such that rain again appears to fall at 30^° with the vertical, will be:- (1) 20 m/s (2) 20\sqrt3 m/s (3)10 m/s (4)10\sqrt3 m/s
Answer» A man at rest observes that rain is falling with the velocity of 20 m/s at an angle 30^° with the vertical. The velocity with which the man should move on a horizontal road, such that rain again appears to fall at 30^° with the vertical, will be:- (1) 20 m/s (2) 20\sqrt3 m/s (3)10 m/s (4)10\sqrt3 m/s

Discussion

50.	Coulombs law of electrostatic force between two point charges and Newton's law for gravitational force between two stationary point masses both have Inverse Square dependence on the distance between the charges and masses respectively compare the strength of these forces by determining the ratio of their magnitude for an electron and a Proton and for two protons estimate the acceleration of electron and proton due to the electrical force on their mutual attraction when they are one Angostorm apart
Answer» Coulombs law of electrostatic force between two point charges and Newton's law for gravitational force between two stationary point masses both have Inverse Square dependence on the distance between the charges and masses respectively compare the strength of these forces by determining the ratio of their magnitude for an electron and a Proton and for two protons estimate the acceleration of electron and proton due to the electrical force on their mutual attraction when they are one Angostorm apart

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A stone of mass m tied to a string of length l is rotating along a circular path with constant speed v. The torque on the stone is

If a body of mass m is raised to a height 2h above the earth’s surface, the gain in potential energy is

A metal disk with a charge Q1=−1e is placed near a metal sphere that has a charge Q2=−4e. If the disk touched the sphere, what is the possible final charge on each object?

An inclined plane makes an angle of 30∘ with the horizontal. A solid sphere rolling down this inclined plane from rest without slipping has a linear acceleration equal to 5gn, then value of n is

Question 39In what way is Rutherford's atomic model different from that of Thomson's atomic model?

Moment of inertia of a disc about an axis which is tangentand parallel to its plane is I. Then, the moment of inertia ofdisc about a tangent, but perpendicular to its plane will be

52.Calculate the debroglie wavelength of the electron orbiting in the n=2 states of hydrogen atom

Consider the Zener voltage regulator shown in the figure below:If the value of zener voltage is 5V then for the minimum value of RL for which Zener diode will be in breakdown is equal to ______kΩ. 2.5

mean value of valtage for full cycle for ac current?

Which product is obtained at anode on electrolysis of aqueous solution of sodium acetate?

If a radioactive sample emits n beta particles in t second and emits 0.75n beta particles in next t second. Find mea life of sample.

A ball is dropped along smooth inclined surfaces AB,AC and AD. The velocity acquired at B,C,D be vB,vC and vD respectively. Then

The resistance of a wire is R Ω . If it is melted and stretched to n times its original length, its new resistance will be

How NO2 is paramagnetic

The coefficient of static friction between a block of mass m and an incline is μs = 0.3. What can be the maximum angle θ of the incline with the horizontal so that the block does not slip on the plane? (Also called angle of repose)

A bimetallic strip is formed out of two identical strips one of copper and the other of brass. The co-efficients of linear expansion of the two metals are aC and aB. On heating, the temperature of the strip goes DT and the strip bends to form an arc of radius of curvature R. Then R is

MOI of a circular ring of radius R about the line passing through its centre of mass in the plane of circle is I. Find the MOI of ring about a line passing through its COM and perpendicular to its plane.

The velocity of water in a river is 18 km h-1 near the surface. If the river is 5 m deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water = 10-2 poise.

A uniform magnetic field →B=(20^i−30^j+50^k) T exists in the space. A charge particle with specific charge 10319 C/kg enters this region at time t=0 with a velocity →v=(20^i+50^j+30^k) m/s. The pitch of the helical path for the motion of the charged particle will be:

ntThere is an electric field E in x- direction . If work done in moving a charge .2 C through a distance of 2m along a line making an angle 60 degree with X - axis is 4 joule , what is the value of E?n ntn

A thin circular plate of radius 1 m has its density varying as ρ(r)=8r where r is the distance from its geometrical centre. Find the moment of inertia of the circular plate about an axis passing through its edge and perpendicular to the plate.

Nh3 me h- bond

Two containers of equal volume contain the same gas at different pressures P1 and P2 and absolute temperatures T1 and T2, respectively. On joining the vessels, the gas reaches a common pressure P and common temperature T. The ratio PT is equal to

A man measures the time period of a simple pendulum inside a stationary lift and finds it to be 10 sec. If the lift accelerates upwards with an acceleration g4, then find the time period of the pendulum.

The driver of train A moving at a constant speed of 30m/s sees another train B moving on the track at a speed of 10m/s in the same direction. He immediately applies break and achieves a uniform retardation of 3m/s2. To avoid collision, what must be the minimum distance between the trains?

28. Two masses m, 1 kg and m2 0.5 kg are suspended together by a massless spring of spring constant 12.5 Nm-1. When masses are in equilibrium m, is removed without disturbing the system. New amplitude of oscillation will be (1) 30 cm (3) 80 cm (2) 50 cm (4) 60 cm

A particle having mass m is projected with a velocity v0 from a point P on a horizontal ground making an angle θ with horizontal. Find out the torque about the point of projection acting on the particle when it is at its maximum height?

You are given two converging lenses of focal lengths, 1.5 cm and 4 cm to design a compound microscope. If it is desired to have a magnifying power of 50, in case of normal adjustment, then find out the separation between the objective lens and the eyepiece.

Potential energy of a particle of mass 2 kg of plating on x-axis is given by U=(k-x)^2-10 the total energy of oscillation is 26 find the maximum speed of particle Why here (k-x)^2 is taken kE

12 g of an alkaline earth metal gives 14.8 g of its hidride. Atomic weight of the metal is (1) 12 (2) 20 (3) 40 (4) 14.

For the given electric field lines configurations, which of the following charge has greater magnitude?

When a resistance of 2 ohms is connected across the terminals of a cell,the current is 0.5 A. When the resistance is increased to 5 ohms,the current becomes 0.25 A. the internal resistance of the cell is

Let →a,→b and →c be three unit vectors such that ∣∣∣→a−→b∣∣∣2+∣∣→a−→c∣∣2=8.Then ∣∣∣→a+2→b∣∣∣2+∣∣→a+2→c∣∣2 is equal to:

A cricketer can throw a ball toa maximum horizontal distance of 100 m. How high above the ground can thecricketer throw the ball, with the same speed?

A body of mass 5 kg falls from a height of 30 M if its all mechanical energy is changed into heat then heat produced will be

A simple pendulum is hanged in a cart and cart issliding on inclined plane of inclination 60^° , withhorizontal. If friction has no role, then time periodof oscillation will be (here, I is length of simple81(1) 2u(2)3/(4) 2g2131

27. Electric field intensity at point B due to the point charge Q kept at point A is 24N/C and the electric potential at point B due to same is 12J/C calculate the distance AB and also the magnitude of charge Q.

In a rectangle ABCD where A is origin as shown in the figure, what is −−→AB+−−→AD ?

The kinetic energy of a projectile at the highest point of it projection is 75% of its kinetic energy at the point of projection. Find the angle of projection.

{ †ext { According to Coulomb's law the atom should disintegrate because of repulsion between protons but } } { †ext { this doesn't happen, why? }