50278 + Interview Questions in Physics

1.	A light string fixed at one end to a clamp on ground passes over a fixed pulley and hangs at the other side. It makes an angle of 30∘ with the ground. A monkey of mass 5 kg climbs up the rope. The clamp can tolerate a vertical force of 40 N only. The maximum acceleration in upward direction with which the monkey can climb safely is (Neglect friction and take g=10 ms−2)
Answer» A light string fixed at one end to a clamp on ground passes over a fixed pulley and hangs at the other side. It makes an angle of $30^{\circ}$ with the ground. A monkey of mass $5 kg$ climbs up the rope. The clamp can tolerate a vertical force of $40 N$ only. The maximum acceleration in upward direction with which the monkey can climb safely is (Neglect friction and take $g = 10 {ms}^{- 2})$

Discussion

2.	According to Bohr's theory, the energy of an electron in the nth orbit of an atom of atomic number Z is proportional to
Answer» According to Bohr's theory, the energy of an electron in the $n^{t h}$ orbit of an atom of atomic number Z is proportional to

Discussion

3.	The thermal conductivity of a material in CGS system is 0.4. In steady state, the rate of flow of heat 10 cal/sec-cm2, then the thermal gradient will be
Answer» The thermal conductivity of a material in CGS system is 0.4. In steady state, the rate of flow of heat 10 cal/sec- $c m^{2}$ , then the thermal gradient will be

3.

The thermal conductivity of a material in CGS system is 0.4. In steady state, the rate of flow of heat 10 cal/sec-cm2, then the thermal gradient will be

Answer»

The thermal conductivity of a material in CGS system is 0.4. In steady state, the rate of flow of heat 10 cal/sec- $c m^{2}$ , then the thermal gradient will be

Discussion

4.	The spiders and insects move and run about on the surface of water without sinking because
Answer» The spiders and insects move and run about on the surface of water without sinking because

Discussion

5.	Two balls are placed as shown in the figure on a weightless support formed by two smooth inclined planes each of which forms an angle of α with the horizontal. The support can slide without friction along a horizontal plane. The upper ball of mass m1 is released. Determine the condition under which the lower ball of mass m2 starts climbing up the support.
Answer» Two balls are placed as shown in the figure on a weightless support formed by two smooth inclined planes each of which forms an angle of $α$ with the horizontal. The support can slide without friction along a horizontal plane. The upper ball of mass $m_{1}$ is released. Determine the condition under which the lower ball of mass $m_{2}$ starts climbing up the support.

Discussion

6.	Three solids of masses m1, m2 and m3 are connected with weightless string in succession and are placed on a frictionless table. If the mass m3 is dragged with a force T, the tension in the string between m2 and m3 is
Answer» Three solids of masses $m_{1}, m_{2} a n d m_{3}$ are connected with weightless string in succession and are placed on a frictionless table. If the mass $m_{3}$ is dragged with a force T, the tension in the string between $m_{2}$ and $m_{3}$ is

Discussion

7.	The acceleration of a moving body can be found from
Answer» The acceleration of a moving body can be found from

7.

The acceleration of a moving body can be found from

Answer»

The acceleration of a moving body can be found from

Discussion

8.	If the distance between the earth and the sun becomes half its present value, the number of days in a year would have been
Answer» If the distance between the earth and the sun becomes half its present value, the number of days in a year would have been

Discussion

9.	PARAGRAPHIn electromagnetic theory, the electric and magnetic phenomena are related to each other. Therefore, the dimensions of electric and magnetic quantities must also be related to each other. In the questions below, [E] and [𝐵] stand for dimensions of electric and magnetic fields respectively, while [ε0] and [μ0] stand for dimensions of the permittivity and permeability of free space respectively. [L] and [T] are dimensions of length and time respectively. All the quantities are given in SI units.The relation between [ε0] and [μ0] is
Answer» PARAGRAPH In electromagnetic theory, the electric and magnetic phenomena are related to each other. Therefore, the dimensions of electric and magnetic quantities must also be related to each other. In the questions below, $[E]$ and [𝐵] stand for dimensions of electric and magnetic fields respectively, while $[ε_{0}]$ and $[μ_{0}]$ stand for dimensions of the permittivity and permeability of free space respectively. $[L]$ and $[T]$ are dimensions of length and time respectively. All the quantities are given in SI units. The relation between $[ε_{0}]$ and $[μ_{0}]$ is

Discussion

10.	A particle having mass m and charge q is released from the origion in a region in which electric field and magnetic field are given by →B=−B0→J and →E=Eo−→K. Find the speed of the particle as a function of its z-coordinate.
Answer» A particle having mass m and charge q is released from the origion in a region in which electric field and magnetic field are given by $\to B = - B_{0} \to J$ and $\to E = E_{o} - \to K .$ Find the speed of the particle as a function of its z-coordinate.

10.

A particle having mass m and charge q is released from the origion in a region in which electric field and magnetic field are given by →B=−B0→J and →E=Eo−→K. Find the speed of the particle as a function of its z-coordinate.

Answer»

A particle having mass m and charge q is released from the origion in a region in which electric field and magnetic field are given by

$\to B = - B_{0} \to J$ and $\to E = E_{o} - \to K .$

Find the speed of the particle as a function of its z-coordinate.

Discussion

11.	A converging lens of focal length 15 cm and a converging mirror of focal length 10 cm are placed 50 cm apart with common principal axis. A point source is placed in between the lens and the mirror at a distance of 40 cm from the lens. Find the locations of the two images formed.
Answer» A converging lens of focal length 15 cm and a converging mirror of focal length 10 cm are placed 50 cm apart with common principal axis. A point source is placed in between the lens and the mirror at a distance of 40 cm from the lens. Find the locations of the two images formed.

Discussion

12.	In a projectile motion, why does the vertical component of velocity become zero at the maximum height?
Answer» In a projectile motion, why does the vertical component of velocity become zero at the maximum height?

Discussion

13.	Let Fpp and Fnn denote the net magnitudes of forces between a proton and a proton, a proton and a neutron, and between two neutrons, when they are 1fm apart. Which is the correct relation?
Answer» Let $F_{p p}$ and $F_{n n}$ denote the net magnitudes of forces between a proton and a proton, a proton and a neutron, and between two neutrons, when they are $1 f m$ apart. Which is the correct relation?

Discussion

14.	A uniform metal rod is used as a bar pendulum. If the room temperature rises by 10 ∘C, and the coefficient of linear expansion of the rod is 2×10−6/ ∘C, the period of the pendulum will have a percentage increase of
Answer» A uniform metal rod is used as a bar pendulum. If the room temperature rises by $10^{\circ} C$ , and the coefficient of linear expansion of the rod is $2 \times 10^{- 6} /^{\circ} C$ , the period of the pendulum will have a percentage increase of

Discussion

15.	Two masses m1 and m2 are connected by a spring of spring constant k and are placed on a friction less horizontal surface.Initially the spring is stretched through a distance x0 when the system is released from rest.Find the distance moved by the two masses before they again come to rest.
Answer» Two masses $m_{1}$ and $m_{2}$ are connected by a spring of spring constant k and are placed on a friction less horizontal surface.Initially the spring is stretched through a distance $x_{0}$ when the system is released from rest.Find the distance moved by the two masses before they again come to rest.

Discussion

16.	At a prayer meeting, the disciples sing JAI-RAM JALRAM. The sound amplified by a loudspeaker comes back after reflection from a building at a distance of 80 m from the meeting. What maximum time interval can be kept between one JAI-RAM and the next JAI-RAM so that the echo does not disturb a listener sitting in the meeting. Speed of sound in air is 320ms−1.
Answer» At a prayer meeting, the disciples sing JAI-RAM JALRAM. The sound amplified by a loudspeaker comes back after reflection from a building at a distance of 80 m from the meeting. What maximum time interval can be kept between one JAI-RAM and the next JAI-RAM so that the echo does not disturb a listener sitting in the meeting. Speed of sound in air is $320 m s^{- 1}$ .

Discussion

17.	The winding of a motor has a resistance of 80 ohms at 150C. Find its resistance at 500 C. the temperature co-efficient of resistance is 0.004/0C
Answer» The winding of a motor has a resistance of 80 ohms at 15⁰C. Find its resistance at 50⁰ C. the temperature co-efficient of resistance is 0.004/⁰C

Discussion

18.	A small ball is suspended from point O by a thread of length l. A nail is driven into the wall at a distance of l2 below O, at A. The ball is drawn aside so that the thread takes up a horizontal position at the level of point O and then released. If highest point to which it rises is xly. Find (y - x)___
Answer» A small ball is suspended from point O by a thread of length l. A nail is driven into the wall at a distance of $\frac{l}{2}$ below O, at A. The ball is drawn aside so that the thread takes up a horizontal position at the level of point O and then released. If highest point to which it rises is $\frac{x l}{y}$ . Find (y - x)___

Discussion

19.	A car covers first half of the total distance with a speed of 20 kmph and the rest with a speed of 40 kmph. The average speed during the journey is (in kmph):
Answer» A car covers first half of the total distance with a speed of 20 kmph and the rest with a speed of 40 kmph. The average speed during the journey is (in kmph):

Discussion

20.	Three charges q1=1 μC, q2=−2 μC, q3=2 μC, are placed at the vertices of an equilateral triangle of side 1m. The magnitude of net electric force in newton on charge q1 is
Answer» Three charges $q_{1} = 1 μ C, q_{2} = - 2 μ C, q_{3} = 2 μ C$ , are placed at the vertices of an equilateral triangle of side 1m. The magnitude of net electric force in newton on charge $q_{1}$ is

Discussion

21.	When a potential difference is applied across, the current passing through
Answer» When a potential difference is applied across, the current passing through

Discussion

22.	A solid sphere of mass 2 kg and diameter 10 cm is rolling without slipping at a speed of 5 ms−1. The rotational kinetic energy of the sphere will be
Answer» A solid sphere of mass $2 kg$ and diameter $10 cm$ is rolling without slipping at a speed of $5 {ms}^{- 1} .$ The rotational kinetic energy of the sphere will be

Discussion

23.	A downward force of 100 N is applied to the small piston with a diameter of 50 cm in the hydraulic lift system as shown in figure. What will be the upward force exerted on the large position with a diameter of 1 m?
Answer» A downward force of $100 N$ is applied to the small piston with a diameter of $50 cm$ in the hydraulic lift system as shown in figure. What will be the upward force exerted on the large position with a diameter of $1 m$ ?

Discussion

24.	Four thin rods of same mass 3 kg and same length 2 m, form a square as shown in figure. Moment of inertia of this system about an axis passing through centre 'O' and perpendicular to its plane is P kg-m2. The value of P is
Answer» Four thin rods of same mass $3 kg$ and same length $2 m$ , form a square as shown in figure. Moment of inertia of this system about an axis passing through centre $'O'$ and perpendicular to its plane is $P {kg-m}^{2}$ . The value of $P$ is

Discussion

25.	What is the difference between gauss theorem and gauss law ?
Answer» What is the difference between gauss theorem and gauss law ?

Discussion

26.	A ring of mass 7.2 kg and of radius 25 cm is experiencing a tension of 880 N while making rotation about its own axis is such a way that each part of the ring has uniform speed. The frequency of rotation of the ring (in rev/min) is (assume surfaces of contact are frictionless)
Answer» A ring of mass $7.2 kg$ and of radius $25 cm$ is experiencing a tension of $880 N$ while making rotation about its own axis is such a way that each part of the ring has uniform speed. The frequency of rotation of the ring (in $rev/min$ ) is (assume surfaces of contact are frictionless)

Discussion

27.	What is the intensity of gravitational field of the centre of a spherical shell
Answer» What is the intensity of gravitational field of the centre of a spherical shell

Discussion

28.	In a tug of war each of the two teams apply 1000 Newton force at the ends of the rope,which is found to be in equilibrium,the tension in the rope is- 1)1000N 2)2000N 3)500N 4)0
Answer» In a tug of war each of the two teams apply 1000 Newton force at the ends of the rope,which is found to be in equilibrium,the tension in the rope is- 1)1000N 2)2000N 3)500N 4)0

28.

In a tug of war each of the two teams apply 1000 Newton force at the ends of the rope,which is found to be in equilibrium,the tension in the rope is- 1)1000N 2)2000N 3)500N 4)0

Answer»

In a tug of war each of the two teams apply 1000 Newton force at the ends of the rope,which is found to be in equilibrium,the tension in the rope is-

1)1000N

2)2000N

3)500N

4)0

Discussion

29.	Two small identical balls P and Q, each of mass √310 gram, carry identical charges and are suspended by threads of equal lengths. At equilibrium, they position themselves as shown in Fig. 20.5 what is the charge on each ball. Given 14πε0=9×109Nm2C−2 and take g=10N/Kg.
Answer» Two small identical balls P and Q, each of mass $\frac{\sqrt{3}}{10}$ gram, carry identical charges and are suspended by threads of equal lengths. At equilibrium, they position themselves as shown in Fig. 20.5 what is the charge on each ball. Given $\frac{1}{4 π ε_{0}} = 9 \times 10^{9} N m^{2} C^{- 2}$ and take $g = 10 N / K g .$

Discussion

30.	In the given graph what is the slope at x=2?
Answer» In the given graph what is the slope at x=2?

Discussion

31.	Match the following. Column 1Column 2AIdeal fluidiCompressible and viscous BNon-uniform flowiiIncompressible and non-viscous CUniform flowiiiAt any instant velocity is constant for all points DReal fluidivVelocity changes from point to point at any given instant of time
Answer» Match the following. $\begin{matrix} Column 1 & Column 2 A & Ideal fluid & i & Compressible and viscous B & Non-uniform flow & i i & Incompressible and non-viscous C & Uniform flow & i i i & At any instant velocity is constant for all points D & Real fluid & i v & Velocity changes from point to point at any given instant of time \end{matrix}$

Discussion

32.	Two tunnels are dug from one side of the earth's surface to the other side, one along a diameter and the other along a chord. Now two particles are dropped from one end of each of the tunnels. Both the particles oscillate simple harmonically along the tunnels. Let T1 and T2 be the time period v1 and v2 be the maximum speed of the particle in the two tunnels. Then
Answer» Two tunnels are dug from one side of the earth's surface to the other side, one along a diameter and the other along a chord. Now two particles are dropped from one end of each of the tunnels. Both the particles oscillate simple harmonically along the tunnels. Let $T_{1}$ and $T_{2}$ be the time period $v_{1}$ and $v_{2}$ be the maximum speed of the particle in the two tunnels. Then

Discussion

33.	If the two wavelength of 800 NM and 600NM are used to get interference on screen 1.4 m away the distance of the two slit is 0.3 mm find the least distance from centre of fringe where the bright fringe of two will coincide
Answer» If the two wavelength of 800 NM and 600NM are used to get interference on screen 1.4 m away the distance of the two slit is 0.3 mm find the least distance from centre of fringe where the bright fringe of two will coincide

Discussion

34.	Static resistance = V/I = 1/ tan(theta) ....how has this relation come ..I just wanted to know where did the relation between tan(theta) come from ?
Answer» Static resistance = V/I = 1/ tan(theta) ....how has this relation come ..I just wanted to know where did the relation between tan(theta) come from ?

Discussion

35.	A stone of mass 2 kg is projected from ground with speed 20 m/s at angle 30∘ with horizontal. The centripetal force acting on the object 1 s after projection is
Answer» A stone of mass $2 kg$ is projected from ground with speed $20 m/s$ at angle $30^{\circ}$ with horizontal. The centripetal force acting on the object $1 s$ after projection is

Discussion

36.	A cup of tea cools from 80∘C to 60∘C in 1 min. The ambient temperature is 30∘C. How much time will it take to cool from 60∘C to 50∘C?
Answer» A cup of tea cools from $80^{\circ} C$ to $60^{\circ} C$ in $1 min$ . The ambient temperature is $30^{\circ} C$ . How much time will it take to cool from $60^{\circ} C$ to $50^{\circ} C$ ?

Discussion

37.	Coil of heater connected to a 200 volt line consumes a power of hundred watt . the coil is divided into two equal parts the two parts are combined in parallel and connected to a 200 volt line what will be the power consumed by the new combination
Answer» Coil of heater connected to a 200 volt line consumes a power of hundred watt . the coil is divided into two equal parts the two parts are combined in parallel and connected to a 200 volt line what will be the power consumed by the new combination

Discussion

38.	Two simple pendulum of lengths 1. 44m and 1m start swinging at the Same time . After how time they will be (1)out of phase and (2)in phase again? Take g=10
Answer» Two simple pendulum of lengths 1. 44m and 1m start swinging at the Same time . After how time they will be (1)out of phase and (2)in phase again? Take g=10

Discussion

39.	A semicircular arc of radius r with charge density μ, having a uniformly charged infinitely long straight wire (with charge density μ) passing through its centre and perpendicular to its plane. Find electrostatic force between them.
Answer» A semicircular arc of radius r with charge density $μ$ , having a uniformly charged infinitely long straight wire (with charge density $μ$ ) passing through its centre and perpendicular to its plane. Find electrostatic force between them.

39.

A semicircular arc of radius r with charge density μ, having a uniformly charged infinitely long straight wire (with charge density μ) passing through its centre and perpendicular to its plane. Find electrostatic force between them.

Answer»

A semicircular arc of radius r with charge density $μ$ , having a uniformly charged infinitely long straight wire (with charge density $μ$ ) passing through its centre and perpendicular to its plane. Find electrostatic force between them.

Discussion

40.	In the given circuit if breakdown voltage of zener diode is 3 volt, then power of zener diode is:
Answer» In the given circuit if breakdown voltage of zener diode is 3 volt, then power of zener diode is:

Discussion

41.	A particle of mass m is located in a one-dimensional potential field, where the potential energy of the particle depends on the coordinate X as U(x)=U0(1−cosβx), Where U0 and β are constants. Find the time period of small oscillations that the particle performs about the equilibrium position.
Answer» A particle of mass m is located in a one-dimensional potential field, where the potential energy of the particle depends on the coordinate X as $U (x) = U_{0} (1 - c o s β x)$ , Where $U_{0}$ and $β$ are constants. Find the time period of small oscillations that the particle performs about the equilibrium position.

Discussion

42.	A monatomic ideal gas follows the process TV3/2= constant. If the molar heat capacity for this process is (5Ry), then the value of y is
Answer» A monatomic ideal gas follows the process $T V^{3 / 2} =$ constant. If the molar heat capacity for this process is $(\frac{5 R}{y})$ , then the value of $y$ is

Discussion

43.	Q. If a body is accelerating: A. It may speed up B. It may speed down C. It may move with same velocity D. It may move with same speed Options correct are: (a) (A,D) (b) (A,B,D) (c) (B,C) (d) (B,C,D)
Answer» Q. If a body is accelerating: A. It may speed up B. It may speed down C. It may move with same velocity D. It may move with same speed Options correct are: (a) (A,D) (b) (A,B,D) (c) (B,C) (d) (B,C,D)

43.

Q. If a body is accelerating: A. It may speed up B. It may speed down C. It may move with same velocity D. It may move with same speed Options correct are: (a) (A,D) (b) (A,B,D) (c) (B,C) (d) (B,C,D)

Answer»

Q. If a body is accelerating:

A. It may speed up

B. It may speed down

C. It may move with same velocity

D. It may move with same speed

Options correct are:

(a) (A,D)

(b) (A,B,D)

(c) (B,C)

(d) (B,C,D)

Discussion

44.	A hoop of mass 'm' and radius 'R' is projected on a floor with linear velocity v0 and reverse spin ω0. The coefficient of friction between the hoop and the ground is μ. Under what of the following condition will the hoop return back?
Answer» A hoop of mass 'm' and radius 'R' is projected on a floor with linear velocity $v_{0}$ and reverse spin $ω_{0}$ . The coefficient of friction between the hoop and the ground is $μ$ . Under what of the following condition will the hoop return back?

Discussion

45.	A body is moving unidirectionally under the influence of a source of constant power, its displacement in time t is proportional to
Answer» A body is moving unidirectionally under the influence of a source of constant power, its displacement in time $t$ is proportional to

Discussion

46.	The electric field at 2r from centre of a uniformly charged non conducting sphere of radius r andE .What is the electric field at distance r/2 from centre?
Answer» The electric field at 2r from centre of a uniformly charged non conducting sphere of radius r andE .What is the electric field at distance r/2 from centre?

Discussion

47.	The centre of mass of a system of three particles of masses 2 g,3g and 5g is taken as the origin of a co-ordinate system. The position vector of a fourth particle of mass 8 g, such that the centre of mass of the four particle system lies at the point (3,4,7) m, is λ(3^i+4^j+7^k) m where λ is a constant. Then, the value of λ= (Answer upto two decimal places)
Answer» The centre of mass of a system of three particles of masses $2 g, 3 g$ and $5 g$ is taken as the origin of a co-ordinate system. The position vector of a fourth particle of mass $8 g$ , such that the centre of mass of the four particle system lies at the point $(3, 4, 7) m$ , is $λ (3^i + 4^j + 7^k) m$ where $λ$ is a constant. Then, the value of $λ =$ (Answer upto two decimal places)

Discussion

48.	A gun mounted on a car moving at a speed of 25 m/s fires at an angle of 60∘ with the horizontal and a velocity of 200 m/s relative to the gun in the direction of motion of the car. Find the distance between the gun and the bullet when the bullet hits the ground.
Answer» A gun mounted on a car moving at a speed of $25 m/s$ fires at an angle of $60^{\circ}$ with the horizontal and a velocity of $200 m/s$ relative to the gun in the direction of motion of the car. Find the distance between the gun and the bullet when the bullet hits the ground.

Discussion

49.	A body of mass 5 kg is raised vertically to a height of 10 m by a force 170 N. The velocity of the body at this height is nearly equal to (Take g=10 ms−2)
Answer» A body of mass $5 kg$ is raised vertically to a height of $10 m$ by a force $170 N$ . The velocity of the body at this height is nearly equal to $(Take g = 10 {ms}^{- 2})$

Discussion

50.	In Young's double-slit experiment , the intensity of light at a point on the screen where the path difference is λ is K units. What is the intensity of light at a point where the path difference is λ/3; λ being the wavelength of light used?
Answer» In Young's double-slit experiment , the intensity of light at a point on the screen where the path difference is $λ$ is K units. What is the intensity of light at a point where the path difference is $λ / 3;$ $λ$ being the wavelength of light used?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

According to Bohr's theory, the energy of an electron in the nth orbit of an atom of atomic number Z is proportional to

The thermal conductivity of a material in CGS system is 0.4. In steady state, the rate of flow of heat 10 cal/sec-cm2, then the thermal gradient will be

The spiders and insects move and run about on the surface of water without sinking because

Three solids of masses m1, m2 and m3 are connected with weightless string in succession and are placed on a frictionless table. If the mass m3 is dragged with a force T, the tension in the string between m2 and m3 is

The acceleration of a moving body can be found from

If the distance between the earth and the sun becomes half its present value, the number of days in a year would have been

A particle having mass m and charge q is released from the origion in a region in which electric field and magnetic field are given by →B=−B0→J and →E=Eo−→K. Find the speed of the particle as a function of its z-coordinate.

A converging lens of focal length 15 cm and a converging mirror of focal length 10 cm are placed 50 cm apart with common principal axis. A point source is placed in between the lens and the mirror at a distance of 40 cm from the lens. Find the locations of the two images formed.

In a projectile motion, why does the vertical component of velocity become zero at the maximum height?

Let Fpp and Fnn denote the net magnitudes of forces between a proton and a proton, a proton and a neutron, and between two neutrons, when they are 1fm apart. Which is the correct relation?

A uniform metal rod is used as a bar pendulum. If the room temperature rises by 10 ∘C, and the coefficient of linear expansion of the rod is 2×10−6/ ∘C, the period of the pendulum will have a percentage increase of

Two masses m1 and m2 are connected by a spring of spring constant k and are placed on a friction less horizontal surface.Initially the spring is stretched through a distance x0 when the system is released from rest.Find the distance moved by the two masses before they again come to rest.

The winding of a motor has a resistance of 80 ohms at 150C. Find its resistance at 500 C. the temperature co-efficient of resistance is 0.004/0C

A car covers first half of the total distance with a speed of 20 kmph and the rest with a speed of 40 kmph. The average speed during the journey is (in kmph):

Three charges q1=1 μC, q2=−2 μC, q3=2 μC, are placed at the vertices of an equilateral triangle of side 1m. The magnitude of net electric force in newton on charge q1 is

When a potential difference is applied across, the current passing through

A solid sphere of mass 2 kg and diameter 10 cm is rolling without slipping at a speed of 5 ms−1. The rotational kinetic energy of the sphere will be

A downward force of 100 N is applied to the small piston with a diameter of 50 cm in the hydraulic lift system as shown in figure. What will be the upward force exerted on the large position with a diameter of 1 m?

Four thin rods of same mass 3 kg and same length 2 m, form a square as shown in figure. Moment of inertia of this system about an axis passing through centre 'O' and perpendicular to its plane is P kg-m2. The value of P is

What is the difference between gauss theorem and gauss law ?

A ring of mass 7.2 kg and of radius 25 cm is experiencing a tension of 880 N while making rotation about its own axis is such a way that each part of the ring has uniform speed. The frequency of rotation of the ring (in rev/min) is (assume surfaces of contact are frictionless)

What is the intensity of gravitational field of the centre of a spherical shell

In a tug of war each of the two teams apply 1000 Newton force at the ends of the rope,which is found to be in equilibrium,the tension in the rope is- 1)1000N 2)2000N 3)500N 4)0

Two small identical balls P and Q, each of mass √310 gram, carry identical charges and are suspended by threads of equal lengths. At equilibrium, they position themselves as shown in Fig. 20.5 what is the charge on each ball. Given 14πε0=9×109Nm2C−2 and take g=10N/Kg.

In the given graph what is the slope at x=2?

Match the following. Column 1Column 2AIdeal fluidiCompressible and viscous BNon-uniform flowiiIncompressible and non-viscous CUniform flowiiiAt any instant velocity is constant for all points DReal fluidivVelocity changes from point to point at any given instant of time

If the two wavelength of 800 NM and 600NM are used to get interference on screen 1.4 m away the distance of the two slit is 0.3 mm find the least distance from centre of fringe where the bright fringe of two will coincide

Static resistance = V/I = 1/ tan(theta) ....how has this relation come ..I just wanted to know where did the relation between tan(theta) come from ?

A stone of mass 2 kg is projected from ground with speed 20 m/s at angle 30∘ with horizontal. The centripetal force acting on the object 1 s after projection is

A cup of tea cools from 80∘C to 60∘C in 1 min. The ambient temperature is 30∘C. How much time will it take to cool from 60∘C to 50∘C?

Coil of heater connected to a 200 volt line consumes a power of hundred watt . the coil is divided into two equal parts the two parts are combined in parallel and connected to a 200 volt line what will be the power consumed by the new combination

Two simple pendulum of lengths 1. 44m and 1m start swinging at the Same time . After how time they will be (1)out of phase and (2)in phase again? Take g=10

A semicircular arc of radius r with charge density μ, having a uniformly charged infinitely long straight wire (with charge density μ) passing through its centre and perpendicular to its plane. Find electrostatic force between them.

In the given circuit if breakdown voltage of zener diode is 3 volt, then power of zener diode is:

A particle of mass m is located in a one-dimensional potential field, where the potential energy of the particle depends on the coordinate X as U(x)=U0(1−cosβx), Where U0 and β are constants. Find the time period of small oscillations that the particle performs about the equilibrium position.

A monatomic ideal gas follows the process TV3/2= constant. If the molar heat capacity for this process is (5Ry), then the value of y is

Q. If a body is accelerating: A. It may speed up B. It may speed down C. It may move with same velocity D. It may move with same speed Options correct are: (a) (A,D) (b) (A,B,D) (c) (B,C) (d) (B,C,D)

A hoop of mass 'm' and radius 'R' is projected on a floor with linear velocity v0 and reverse spin ω0. The coefficient of friction between the hoop and the ground is μ. Under what of the following condition will the hoop return back?

A body is moving unidirectionally under the influence of a source of constant power, its displacement in time t is proportional to

The electric field at 2r from centre of a uniformly charged non conducting sphere of radius r andE .What is the electric field at distance r/2 from centre?

A gun mounted on a car moving at a speed of 25 m/s fires at an angle of 60∘ with the horizontal and a velocity of 200 m/s relative to the gun in the direction of motion of the car. Find the distance between the gun and the bullet when the bullet hits the ground.

A body of mass 5 kg is raised vertically to a height of 10 m by a force 170 N. The velocity of the body at this height is nearly equal to (Take g=10 ms−2)

In Young's double-slit experiment , the intensity of light at a point on the screen where the path difference is λ is K units. What is the intensity of light at a point where the path difference is λ/3; λ being the wavelength of light used?