50278 + Interview Questions in Physics

1.	A body of moment of inertia 2 kg metre square to rotates with a velocity of 10 Radian per second when an external force of 10 Newton metre is acting on it. If the force is removed calculate the time to stop and total angle covered by it
Answer» A body of moment of inertia 2 kg metre square to rotates with a velocity of 10 Radian per second when an external force of 10 Newton metre is acting on it. If the force is removed calculate the time to stop and total angle covered by it

Discussion

2.	The length of the wire shown in figure between the pulley and fixed support is 1.5 m and mass is 12.0 g. The frequency of vibration with which the wire vibrates in two loops leaving the middle point of the wire between the pulley and the fixed support, is: [Assume the pulley acts as a fixed support and consider g=10 m/s2]
Answer» The length of the wire shown in figure between the pulley and fixed support is $1.5 m$ and mass is $12.0 g$ . The frequency of vibration with which the wire vibrates in two loops leaving the middle point of the wire between the pulley and the fixed support, is: [Assume the pulley acts as a fixed support and consider $g = 10 {m/s}^{2}$ ]

Discussion

3.	Two wires of same length and thickness having specific resistances 6 Ω-cm and 3 Ω-cm respectively are connected in parallel. The effective resistivity of the combination is ρ Ω-cm. The value of ρ, to the nearest integer, is ________.
Answer» Two wires of same length and thickness having specific resistances $6 Ω -cm$ and $3 Ω -cm$ respectively are connected in parallel. The effective resistivity of the combination is $ρ Ω -cm$ . The value of $ρ$ , to the nearest integer, is ________.

Discussion

4.	Two bodies of equal masses(m)moving with equal velocities (v) in opposite directions collide and stick with each other .The resul†an t velocity of the combination is
Answer» Two bodies of equal masses(m)moving with equal velocities (v) in opposite directions collide and stick with each other .The resul†an t velocity of the combination is

Discussion

5.	Two drops of the same radius are falling through air with a steady velocity of 5 cm per sec. If the two drops coalesce, the terminal velocity would be
Answer» Two drops of the same radius are falling through air with a steady velocity of 5 cm per sec. If the two drops coalesce, the terminal velocity would be

Discussion

6.	A Body moves 6 m north. 8 m east and 10m vertically upwards, what is the magnitude of its resultant displacement from initial position?
Answer» A Body moves 6 m north. 8 m east and 10m vertically upwards, what is the magnitude of its resultant displacement from initial position?

Discussion

7.	82.In a double slit experiment the distance between the slit is d. the screen is at a distance D from the slit and lambda is wavelength of light used. If a dark fringe is formed opposite to a slit on the screen the order of fringe is
Answer» 82.In a double slit experiment the distance between the slit is d. the screen is at a distance D from the slit and lambda is wavelength of light used. If a dark fringe is formed opposite to a slit on the screen the order of fringe is

Discussion

8.	Consider the cyclic process ABCA, shown in figure, performed on a sample of 2.0 mol of an ideal gas. A total of 1200 J of heat is withdrawn from the sample in the process. Find the work done by the gas during the part BC.
Answer» Consider the cyclic process ABCA, shown in figure, performed on a sample of 2.0 mol of an ideal gas. A total of 1200 J of heat is withdrawn from the sample in the process. Find the work done by the gas during the part BC.

8.

Consider the cyclic process ABCA, shown in figure, performed on a sample of 2.0 mol of an ideal gas. A total of 1200 J of heat is withdrawn from the sample in the process. Find the work done by the gas during the part BC.

Answer»

Consider the cyclic process ABCA, shown in figure, performed on a sample of 2.0 mol of an ideal gas. A total of 1200 J of heat is withdrawn from the sample in the process. Find the work done by the gas during the part BC.

Discussion

9.	In YDSE if the source consists of two wave lengths λ1=4000a° and λ2=4002A° . Find the dis†an ce from centre where fringes disappear if d=1cm;D=1m
Answer» In YDSE if the source consists of two wave lengths λ1=4000a° and λ2=4002A° . Find the dis†an ce from centre where fringes disappear if d=1cm;D=1m

Discussion

10.	A block of mass 10 kg is at rest on a rough horizontal surface. A force of 40 N is applied on it as shown in figure. The acceleration of the block is: (Take g=10 m/s2)
Answer» A block of mass $10 kg$ is at rest on a rough horizontal surface. A force of $40 N$ is applied on it as shown in figure. The acceleration of the block is: (Take $g = 10 {m/s}^{2}$ )

Discussion

11.	A point object of mass m is slipping down on a smooth hemispherical body of mass M and radius R. The point object is tied to a wall by an ideal string as shown. At a certain instant shown in figure, speed of the hemisphere is v and its acceleration is a. Then speed vp and acceleration ap of the point object is (Assume all the surfaces in contact are frictionless).
Answer» A point object of mass m is slipping down on a smooth hemispherical body of mass M and radius R. The point object is tied to a wall by an ideal string as shown. At a certain instant shown in figure, speed of the hemisphere is $v$ and its acceleration is a. Then speed $v_{p}$ and acceleration $a_{p}$ of the point object is (Assume all the surfaces in contact are frictionless).

Discussion

12.	A particle is released from height S from the surface of the Earth. At a certain height, its kinetic energy is three times of its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively
Answer» A particle is released from height $S$ from the surface of the Earth. At a certain height, its kinetic energy is three times of its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively

Discussion

13.	If the mass of the pulleys shown in figure is very very small and the cord is inextensible, the angular frequency of oscillation of the system is
Answer» If the mass of the pulleys shown in figure is very very small and the cord is inextensible, the angular frequency of oscillation of the system is

Discussion

14.	If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will
Answer» If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will

14.

If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will

Answer»

If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will

Discussion

15.	By blowing air in soap bubble the radius is increased from 2r to 3r then percentage increase in surface energy of bubble is
Answer» By blowing air in soap bubble the radius is increased from 2r to 3r then percentage increase in surface energy of bubble is

Discussion

16.	A charge Q is uniformly distributed over a rod of length 2l consider cube of edge l with the center of cube at one end of the rod the minimum possible electric flux through the s
Answer» A charge Q is uniformly distributed over a rod of length 2l consider cube of edge l with the center of cube at one end of the rod the minimum possible electric flux through the s

Discussion

17.	The rest positions of the needles in a milliammeter and voltmeter not in use are as shown in Fig. A. When a student uses these in his experiment, the readings of the needles are in the positions shown in Fig. B. The corrected values of current and voltage in the experiment are (1) 42 mA and 3.2 V(2) 42 mA and 4.0 V(3) 34 mA and 3.2 V(4) 34 mA and 4.0 V
Answer» The rest positions of the needles in a milliammeter and voltmeter not in use are as shown in Fig. A. When a student uses these in his experiment, the readings of the needles are in the positions shown in Fig. B. The corrected values of current and voltage in the experiment are (1) 42 mA and 3.2 V (2) 42 mA and 4.0 V (3) 34 mA and 3.2 V (4) 34 mA and 4.0 V

Discussion

18.	A bob of mass 10 kg is attached to wire 0.3 m long. Its breaking stress is 4.8×107N/m2. The area of cross section of the wire is 10−6m2. The maximum angular velocity with which it can be rotated in a horizontal circle
Answer» A bob of mass 10 kg is attached to wire 0.3 m long. Its breaking stress is $4.8 \times 10^{7} N / m 2$ . The area of cross section of the wire is $10^{- 6} m^{2}$ . The maximum angular velocity with which it can be rotated in a horizontal circle

Discussion

19.	Knowing that mass of Moon is M81 where M is the mass of Earth, find the distance of the point where gravitational field due to Earth and Moon cancel each other, from the Moon. Given that distance between Earth and Moon is 60 R. Where R is the radius of Earth
Answer» Knowing that mass of Moon is $\frac{M}{81}$ where M is the mass of Earth, find the distance of the point where gravitational field due to Earth and Moon cancel each other, from the Moon. Given that distance between Earth and Moon is 60 R. Where R is the radius of Earth

Discussion

20.	A small sphere of radius r1 and charge q1 is enclosed by a spherical shell of radius r2 and charge q2. Show that if q1 is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge q2 on the shell is.
Answer» A small sphere of radius r₁ and charge q₁ is enclosed by a spherical shell of radius r₂ and charge q₂. Show that if q₁ is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge q₂ on the shell is.

Discussion

21.	A projectile is fired at an angle of 45∘ with the horizontal. What will be the elevation angle of the projectile at its highest point as seen from the point of projection?
Answer» A projectile is fired at an angle of $45^{\circ}$ with the horizontal. What will be the elevation angle of the projectile at its highest point as seen from the point of projection?

Discussion

22.	The equation of a wave is given by, y=7sin[7π−0.04π+(π3)] where x & y are in meters & t is in seconds. The speed of the wave is
Answer» The equation of a wave is given by, $y = 7 s i n [7 π - 0.04 π + (\frac{π}{3})]$ where x & y are in meters & t is in seconds. The speed of the wave is

Discussion

23.	A monochromatic light is traveling in a medium of refractive index n=1.6. It enters a stack of glass layer from the bottom side at an angle θ=30∘. The interfaces of the glass layers are parallel to each other. The refractive indices of different glass layer are monotonically decreasing as nm=n−mΔn, where nm is the refractive index of the mth slab and Δn=0.1 (see the figure). The ray is refracted out parallel to the interface between the (m−1)th and mth slabs from the right side of the stack. What is the value of m is
Answer» A monochromatic light is traveling in a medium of refractive index $n = 1.6$ . It enters a stack of glass layer from the bottom side at an angle $θ = 30^{\circ} .$ The interfaces of the glass layers are parallel to each other. The refractive indices of different glass layer are monotonically decreasing as $n_{m} = n - m Δ n$ , where $n_{m}$ is the refractive index of the $m^{t h}$ slab and $Δ n = 0.1$ (see the figure). The ray is refracted out parallel to the interface between the $(m - 1)^{t h}$ and $m^{t h}$ slabs from the right side of the stack. What is the value of $m$ is

Discussion

24.	A horizontal overheadpower line carries a current of 90 A in east to west direction. Whatis the magnitude and direction of the magnetic field due to thecurrent 1.5 m below the line?
Answer» A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.5 m below the line?

Discussion

25.	At the top of the trajectory of the projectile the directions of its velocity and acceleration are??
Answer» At the top of the trajectory of the projectile the directions of its velocity and acceleration are??

Discussion

26.	what will be the moment of inertia of an equilateral triangular sheet through any one of the side of the triangular sheet
Answer» what will be the moment of inertia of an equilateral triangular sheet through any one of the side of the triangular sheet

Discussion

27.	A system has absorbed 5 kcal of heat and does 200 J of work. The change in internal energy of the system is
Answer» A system has absorbed $5 kcal$ of heat and does $200 J$ of work. The change in internal energy of the system is

Discussion

28.	Draw the typical input and output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance (ri), and (b) current amplification factor β.Input charcteristics: It is the graph drawn between input current and input voltage when output voltage is kept constant.Output characteristics : It is the graph drawn between output current and output voltage when input current is kept constant.(a) Input resitance (Ri=[Change in emitter base voltage(△VBE)Change in base current(△IB)]at constantVCEor Ri=(△VBE△IB)VCE(b) Current amplification factor, (β)=(△IC△IB)VCE = △IC△IE−△IC= △IC△IE△IC△IE−△IC△IE = α1−α⇒ β=α1−α
Answer» Draw the typical input and output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance $(r_{i})$ , and (b) current amplification factor $β$ . Input charcteristics: It is the graph drawn between input current and input voltage when output voltage is kept constant. Output characteristics : It is the graph drawn between output current and output voltage when input current is kept constant. (a) Input resitance $(R_{i}$ $= {[\frac{Change in emitter base voltage (△ V_{B E})}{Change in base current (△ I_{B})}]}_{at constant V_{C E}}$ or $R_{i} = {(\frac{△ V_{B E}}{△ I_{B}})}_{V_{C E}}$ (b) Current amplification factor, $(β) = {(\frac{△ I_{C}}{△ I_{B}})}_{V_{C E}}$ = $\frac{△ I_{C}}{△ I_{E} - △ I_{C}}$ = $\frac{\frac{△ I_{C}}{△ I_{E}}}{\frac{△ I_{C}}{△ I_{E}} - \frac{△ I_{C}}{△ I_{E}}}$ = $\frac{α}{1 - α}$ $\Rightarrow β = \frac{α}{1 - α}$

Discussion

29.	If the body is moving in a circle of radius r with a constant speed v, its angular velocity is
Answer» If the body is moving in a circle of radius r with a constant speed v, its angular velocity is

Discussion

30.	Two parallel plate capacitors of capcitances C and 2C are connected in parallel and changed to a potential V by a battery. The battery is then disconnected and the apsce between the plates of capacitor C is completely filled with a material of dielectric constant K. The potential difference across the capacitors now becomes
Answer» Two parallel plate capacitors of capcitances C and 2C are connected in parallel and changed to a potential V by a battery. The battery is then disconnected and the apsce between the plates of capacitor C is completely filled with a material of dielectric constant K. The potential difference across the capacitors now becomes

Discussion

31.	An incompressible liquid is flowing through the horizontal pipe as shown in the figure. Pipe 1 is connected to the pipe 2 and pipe 3. The flow of liquid through the pipe 1, pipe 2 and pipe 3 are 8 m/s,6 m/s and 1.1 m/s respectively. If cross-section area of pipe 1 and pipe 2 are 1 m2 and 0.8 m2, find the area of cross-section of pipe 3.
Answer» An incompressible liquid is flowing through the horizontal pipe as shown in the figure. Pipe $1$ is connected to the pipe $2$ and pipe $3$ . The flow of liquid through the pipe $1$ , pipe $2$ and pipe $3$ are $8 m/s, 6 m/s$ and $1.1 m/s$ respectively. If cross-section area of pipe $1$ and pipe $2$ are $1 m^{2}$ and $0.8 m^{2}$ , find the area of cross-section of pipe $3$ .

Discussion

32.	An electronically driven loudspeaker is placed near the open end of a resonance column apparatus. The length of air column in the tube is 40 cm. The frequency of the loudspeaker can be varied between 20 Hz−2 kHz. Choose among the following frequencies at which the column will resonate.[Speed of sound in air =320 ms−1 ]
Answer» An electronically driven loudspeaker is placed near the open end of a resonance column apparatus. The length of air column in the tube is $40 cm$ . The frequency of the loudspeaker can be varied between $20 Hz - 2 kHz$ . Choose among the following frequencies at which the column will resonate. [Speed of sound in air $= 320 {ms}^{- 1}$ ]

Discussion

33.	Two circuits are shown in the figure (a) & (b). At a frequency of rad s−1, the average power dissipated in one cycle will be the same in both the circuits.
Answer» Two circuits are shown in the figure (a) & (b). At a frequency of ${rad s}^{- 1}$ , the average power dissipated in one cycle will be the same in both the circuits.

Discussion

34.	Block of mass 10kg is moving on inclined plane of angle 37 degree with constant velocity 10m/s the coeficcient of kinetic friction between inclined plane and block is
Answer» Block of mass 10kg is moving on inclined plane of angle 37 degree with constant velocity 10m/s the coeficcient of kinetic friction between inclined plane and block is

Discussion

35.	Two resistors with temperature coefficients of resistance α1 and α2 have resistances R1 and R2 at 0∘C. What is the temperature coefficient of the compound resistor consisting of the two resistors connected in parallel?
Answer» Two resistors with temperature coefficients of resistance $α_{1}$ and $α_{2}$ have resistances $R_{1}$ and $R_{2}$ at $0^{\circ} C$ . What is the temperature coefficient of the compound resistor consisting of the two resistors connected in parallel?

Discussion

36.	A charge (q, m) perpendicularly enters a semi - infinite B - field with a speed v. Find the deviation and the time it spends in the B-field.
Answer» A charge (q, m) perpendicularly enters a semi - infinite B - field with a speed v. Find the deviation and the time it spends in the B-field.

Discussion

37.	The rate of diffusion of two gases A and B is in the ratio of 1:2 and the B and C in the ratio 1:8, the rate of diffusion of C with respect to A is
Answer» The rate of diffusion of two gases $A$ and $B$ is in the ratio of $1 : 2$ and the $B$ and $C$ in the ratio $1 : 8$ , the rate of diffusion of $C$ with respect to $A$ is

Discussion

38.	38.A centre of mass of a disc rolling on a plane surface moves with speed V. What is the speed of a particle on the edge of the disc at top point will be moving at instantaneous?
Answer» 38.A centre of mass of a disc rolling on a plane surface moves with speed V. What is the speed of a particle on the edge of the disc at top point will be moving at instantaneous?

Discussion

39.	The main scale reading of a vernier calliper is obtained as 3.2 cm for an object placed in it. If the 4th division of the vernier scale coincides with a division on the main scale, and the magnitude of the positive zero error is 0.03 cm, what is the true length of the object in cm? Take L.C. = 0.01 cm.3.21
Answer» The main scale reading of a vernier calliper is obtained as 3.2 cm for an object placed in it. If the 4th division of the vernier scale coincides with a division on the main scale, and the magnitude of the positive zero error is 0.03 cm, what is the true length of the object in cm? Take L.C. = 0.01 cm. 3.21

Discussion

40.	ntWhat is the smallest possible charge ??n
Answer» ntWhat is the smallest possible charge ??n

Discussion

41.	The activity of a freshly prepared radioactive sample is 1010 disintegrations per second, whose mean life is 109 s. The mass of an atom of this radioisotope is 10−25 kg. The mass (in mg) of the radioactive sample is
Answer» The activity of a freshly prepared radioactive sample is $10^{10}$ disintegrations per second, whose mean life is $10^{9} s$ . The mass of an atom of this radioisotope is $10^{- 25} k g .$ The mass $(i n m g)$ of the radioactive sample is

Discussion

42.	A two winding transformer is rated at 60 kVA, 240/1200 V, at 60 Hz with efficiency of 0.96. If the same transformer is used as as a 1440/1200 V step down auto transformer in a power system, the kVA rating of the auto transformer will increase by ______ times.6
Answer» A two winding transformer is rated at 60 kVA, 240/1200 V, at 60 Hz with efficiency of 0.96. If the same transformer is used as as a 1440/1200 V step down auto transformer in a power system, the kVA rating of the auto transformer will increase by ______ times. 6

Discussion

43.	Two inductors whose self-inductances are of 15 mH and 25 mH respectively are connected together in parallel aiding. Their mutual inductance is given as 5 mH. Calculate the total inductance of the parallel combination.
Answer» Two inductors whose self-inductances are of $15 mH$ and $25 mH$ respectively are connected together in parallel aiding. Their mutual inductance is given as $5 mH$ . Calculate the total inductance of the parallel combination.

Discussion

44.	While you are travelling in a car on a straight road at 90 km/h, another car passes you in the same direction; its speedometer reads 120 km/h. What is your velocity relative to the other driver? (in km/h)
Answer» While you are travelling in a car on a straight road at $90 km/h$ , another car passes you in the same direction; its speedometer reads $120 km/h$ . What is your velocity relative to the other driver? (in km/h)

Discussion

45.	In order to simulate different values of g, aspiring astronauts are put on a plane which is accelerating upward in a parabola given by the equation x2= 500 y, where x is horizontal and y is vertically upwards, both being measured in meter. The x-component of velocity of the plane is constant and has the value of 360 kmh−1. The effective value of g experienced by an astronaut on the plane is β×g. Then β will be
Answer» In order to simulate different values of $g$ , aspiring astronauts are put on a plane which is accelerating upward in a parabola given by the equation $x^{2} = 500 y$ , where $x$ is horizontal and $y$ is vertically upwards, both being measured in meter. The $x$ -component of velocity of the plane is constant and has the value of $360 k m h^{- 1}$ . The effective value of $g$ experienced by an astronaut on the plane is $β \times g$ . Then $β$ will be

Discussion

46.	A car of mass 1×103 kg travelling at a velocity 5 m/s comes to rest in 2 sec, when it strikes a wall. What is the force exerted by the wall on car?
Answer» A car of mass $1 \times 10^{3} kg$ travelling at a velocity $5 m/s$ comes to rest in $2 sec$ , when it strikes a wall. What is the force exerted by the wall on car?

Discussion

47.	In the arrangement shown in the figure, a block of mass m is rigidly attached to two identical springs of stiffness constant K each. The other ends of the springs are connected to fixed walls. The block is initially at rest and can slide on a frictionless horizontal bar AB when displaced. The arrangement rotates with a constant angular velocity ω about an axis passing through the middle of the bar. Find the time period of small oscillations of the block.
Answer» In the arrangement shown in the figure, a block of mass $m$ is rigidly attached to two identical springs of stiffness constant $K$ each. The other ends of the springs are connected to fixed walls. The block is initially at rest and can slide on a frictionless horizontal bar $A B$ when displaced. The arrangement rotates with a constant angular velocity $ω$ about an axis passing through the middle of the bar. Find the time period of small oscillations of the block.

Discussion

48.	In a two dimensional motion, instantaneous speed Vo is a positive constant. Then which of the following are necessarily true?
Answer» In a two dimensional motion, instantaneous speed $V_{o}$ is a positive constant. Then which of the following are necessarily true?

Discussion

49.	When is the force experienced by a current-carrying conductor placed in a magnetic field largest ?
Answer» When is the force experienced by a current-carrying conductor placed in a magnetic field largest ?

Discussion

50.	35.a car of mass m is moving on a level circular track of radius R.Its coeffecient of static friction between road and tyres of car is represented by (meu)s , the maximum speed of car in circular motion is given by
Answer» 35.a car of mass m is moving on a level circular track of radius R.Its coeffecient of static friction between road and tyres of car is represented by (meu)s , the maximum speed of car in circular motion is given by

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A body of moment of inertia 2 kg metre square to rotates with a velocity of 10 Radian per second when an external force of 10 Newton metre is acting on it. If the force is removed calculate the time to stop and total angle covered by it

Two wires of same length and thickness having specific resistances 6 Ω-cm and 3 Ω-cm respectively are connected in parallel. The effective resistivity of the combination is ρ Ω-cm. The value of ρ, to the nearest integer, is ________.

Two bodies of equal masses(m)moving with equal velocities (v) in opposite directions collide and stick with each other .The resul†an t velocity of the combination is

Two drops of the same radius are falling through air with a steady velocity of 5 cm per sec. If the two drops coalesce, the terminal velocity would be

A Body moves 6 m north. 8 m east and 10m vertically upwards, what is the magnitude of its resultant displacement from initial position?

82.In a double slit experiment the distance between the slit is d. the screen is at a distance D from the slit and lambda is wavelength of light used. If a dark fringe is formed opposite to a slit on the screen the order of fringe is

Consider the cyclic process ABCA, shown in figure, performed on a sample of 2.0 mol of an ideal gas. A total of 1200 J of heat is withdrawn from the sample in the process. Find the work done by the gas during the part BC.

In YDSE if the source consists of two wave lengths λ1=4000a° and λ2=4002A° . Find the dis†an ce from centre where fringes disappear if d=1cm;D=1m

A block of mass 10 kg is at rest on a rough horizontal surface. A force of 40 N is applied on it as shown in figure. The acceleration of the block is: (Take g=10 m/s2)

A particle is released from height S from the surface of the Earth. At a certain height, its kinetic energy is three times of its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively

If the mass of the pulleys shown in figure is very very small and the cord is inextensible, the angular frequency of oscillation of the system is

If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will

By blowing air in soap bubble the radius is increased from 2r to 3r then percentage increase in surface energy of bubble is

A charge Q is uniformly distributed over a rod of length 2l consider cube of edge l with the center of cube at one end of the rod the minimum possible electric flux through the s

A bob of mass 10 kg is attached to wire 0.3 m long. Its breaking stress is 4.8×107N/m2. The area of cross section of the wire is 10−6m2. The maximum angular velocity with which it can be rotated in a horizontal circle

Knowing that mass of Moon is M81 where M is the mass of Earth, find the distance of the point where gravitational field due to Earth and Moon cancel each other, from the Moon. Given that distance between Earth and Moon is 60 R. Where R is the radius of Earth

A small sphere of radius r1 and charge q1 is enclosed by a spherical shell of radius r2 and charge q2. Show that if q1 is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge q2 on the shell is.

A projectile is fired at an angle of 45∘ with the horizontal. What will be the elevation angle of the projectile at its highest point as seen from the point of projection?

The equation of a wave is given by, y=7sin[7π−0.04π+(π3)] where x &amp; y are in meters &amp; t is in seconds. The speed of the wave is

A horizontal overheadpower line carries a current of 90 A in east to west direction. Whatis the magnitude and direction of the magnetic field due to thecurrent 1.5 m below the line?

At the top of the trajectory of the projectile the directions of its velocity and acceleration are??

what will be the moment of inertia of an equilateral triangular sheet through any one of the side of the triangular sheet

A system has absorbed 5 kcal of heat and does 200 J of work. The change in internal energy of the system is

If the body is moving in a circle of radius r with a constant speed v, its angular velocity is

Two circuits are shown in the figure (a) & (b). At a frequency of rad s−1, the average power dissipated in one cycle will be the same in both the circuits.

Block of mass 10kg is moving on inclined plane of angle 37 degree with constant velocity 10m/s the coeficcient of kinetic friction between inclined plane and block is

Two resistors with temperature coefficients of resistance α1 and α2 have resistances R1 and R2 at 0∘C. What is the temperature coefficient of the compound resistor consisting of the two resistors connected in parallel?

A charge (q, m) perpendicularly enters a semi - infinite B - field with a speed v. Find the deviation and the time it spends in the B-field.

The rate of diffusion of two gases A and B is in the ratio of 1:2 and the B and C in the ratio 1:8, the rate of diffusion of C with respect to A is

38.A centre of mass of a disc rolling on a plane surface moves with speed V. What is the speed of a particle on the edge of the disc at top point will be moving at instantaneous?

ntWhat is the smallest possible charge ??n

The activity of a freshly prepared radioactive sample is 1010 disintegrations per second, whose mean life is 109 s. The mass of an atom of this radioisotope is 10−25 kg. The mass (in mg) of the radioactive sample is

A two winding transformer is rated at 60 kVA, 240/1200 V, at 60 Hz with efficiency of 0.96. If the same transformer is used as as a 1440/1200 V step down auto transformer in a power system, the kVA rating of the auto transformer will increase by ______ times.6

Two inductors whose self-inductances are of 15 mH and 25 mH respectively are connected together in parallel aiding. Their mutual inductance is given as 5 mH. Calculate the total inductance of the parallel combination.

While you are travelling in a car on a straight road at 90 km/h, another car passes you in the same direction; its speedometer reads 120 km/h. What is your velocity relative to the other driver? (in km/h)

A car of mass 1×103 kg travelling at a velocity 5 m/s comes to rest in 2 sec, when it strikes a wall. What is the force exerted by the wall on car?

In a two dimensional motion, instantaneous speed Vo is a positive constant. Then which of the following are necessarily true?

When is the force experienced by a current-carrying conductor placed in a magnetic field largest ?

35.a car of mass m is moving on a level circular track of radius R.Its coeffecient of static friction between road and tyres of car is represented by (meu)s , the maximum speed of car in circular motion is given by

The equation of a wave is given by, y=7sin[7π−0.04π+(π3)] where x & y are in meters & t is in seconds. The speed of the wave is