50278 + Interview Questions in Physics

1.	20l%(w/v)NaOH.Density of solution 1.6g/ml.calculate molarity and molality. Calculate the total charge present in 14gm of N3-
Answer» 20l%(w/v)NaOH.Density of solution 1.6g/ml.calculate molarity and molality. Calculate the total charge present in 14gm of N3-

Discussion

2.	explain by plotting a graph bewtween photocurrent and potential that how all photoelectrons does not have same kinetic energy while having same value of stopping potential
Answer» explain by plotting a graph bewtween photocurrent and potential that how all photoelectrons does not have same kinetic energy while having same value of stopping potential

Discussion

3.	The sensitivity of a moving coil galvanometer is S. If a shunt of (18)th of the resistance of the galvanometer is connected to the moving coil galvanometer, its sensitivity becomes:
Answer» The sensitivity of a moving coil galvanometer is $S$ . If a shunt of ${(\frac{1}{8})}^{t h}$ of the resistance of the galvanometer is connected to the moving coil galvanometer, its sensitivity becomes:

Discussion

4.	A single -phase, 4 kVA, 200 V/100 V, 50 Hz transformer has laminated CRGO steel core shows rated no load loss of 500 W. When hv side winding is excited with 180 V, 45 Hz sinusoidal ac supply, the no load losses were measured 420 W. When hv side winding is excited by 100 V, 25 Hz sinusoidal ac source, the no load losses will be ________ W (upto 2 decimal place).166.56
Answer» A single -phase, 4 kVA, 200 V/100 V, 50 Hz transformer has laminated CRGO steel core shows rated no load loss of 500 W. When hv side winding is excited with 180 V, 45 Hz sinusoidal ac supply, the no load losses were measured 420 W. When hv side winding is excited by 100 V, 25 Hz sinusoidal ac source, the no load losses will be ________ W (upto 2 decimal place). 166.56

Discussion

5.	21.A concave mirror of focal length 8 cm is placed on a table with its reflecting surface turned upwards . The mirror contains a little amount of water in it. At what distance from the pole of the mirror should a point object be placed on the axis of the mirror so that the image and object coincide? Refractive index of water is 4/3.
Answer» 21.A concave mirror of focal length 8 cm is placed on a table with its reflecting surface turned upwards . The mirror contains a little amount of water in it. At what distance from the pole of the mirror should a point object be placed on the axis of the mirror so that the image and object coincide? Refractive index of water is 4/3.

Discussion

6.	The angle made by the moon on an astronomical telescope is 0.1 rad. Focal length of the objective lens and the eyepiece of the telescope are 10 cm and 5 cm respectively. Find the angle subtended by the final image at the eyepiece, in case of the least strain on the eye.
Answer» The angle made by the moon on an astronomical telescope is $0.1 rad$ . Focal length of the objective lens and the eyepiece of the telescope are $10 cm$ and $5 cm$ respectively. Find the angle subtended by the final image at the eyepiece, in case of the least strain on the eye.

Discussion

7.	Two buildings are 20m and 25m high. If the buildings are 12m apart, find the distance between their tops.undefinedundefinedundefinedundefined
Answer» Two buildings are 20m and 25m high. If the buildings are 12m apart, find the distance between their tops. undefined undefined undefined undefined

Discussion

8.	The frequency of a radar is 780 MHz. After getting reflected from an approaching aeroplane, the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of
Answer» The frequency of a radar is 780 MHz. After getting reflected from an approaching aeroplane, the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of

Discussion

9.	A capacitor initially given a charge Qo is connected across a resistor R at t=0. The separation between the plates changes according to, d=do1+t (0≤t<1).. The variation of charge with time is Qo(x+t)−1/RCo. The value of x is ______.
Answer» A capacitor initially given a charge $Q_{o}$ is connected across a resistor $R$ at $t = 0$ . The separation between the plates changes according to, $d = \frac{d_{o}}{1 + t} (0 \leq t < 1)$ .. The variation of charge with time is $Q_{o} {(x + t)}^{- 1 / R C_{o}}$ . The value of $x$ is ______.

Discussion

10.	The current in a conductor varies with time t as I=3t+4t2,where I in ampere and t in seconds. The elelctric charge flows through the section of the conductor between t=1 s and t=3 s is n3C. Here value of n is
Answer» The current in a conductor varies with time $t$ as $I = 3 t + 4 t^{2}$ ,where $I$ in ampere and $t$ in seconds. The elelctric charge flows through the section of the conductor between $t = 1 s$ and $t = 3 s$ is $\frac{n}{3} C$ . Here value of $n$ is

Discussion

11.	baurnouli's eqation
Answer» baurnouli's eqation

Discussion

12.	41. The area of the acceleration-displacement curve of a body gives 1. Impulse 2. Change in momentum per unit mass 3. Change in KE per unit mass 4. Total change in energy
Answer» 41. The area of the acceleration-displacement curve of a body gives 1. Impulse 2. Change in momentum per unit mass 3. Change in KE per unit mass 4. Total change in energy

Discussion

13.	A projectile is fired at an angle theta with velocity u. At the top of it's trajectory it explodes into two parts of equal masses. One of them moves vertically upwards with velocity ucos theta . Find out velocity of the other part.
Answer» A projectile is fired at an angle theta with velocity u. At the top of it's trajectory it explodes into two parts of equal masses. One of them moves vertically upwards with velocity ucos theta . Find out velocity of the other part.

Discussion

14.	If the magnetic field is parallel to a surface then the magnetic flux through the surface is
Answer» If the magnetic field is parallel to a surface then the magnetic flux through the surface is

Discussion

15.	A solenoid of inductance 50 mH and resistance 10 Ω is connected to a battery of 6 V. The time elapsed before the current acquires half of its steady state value from zero is-(ln2=0.693)
Answer» A solenoid of inductance $50 mH$ and resistance $10 Ω$ is connected to a battery of $6 V .$ The time elapsed before the current acquires half of its steady state value from zero is- $(ln 2 = 0.693)$

Discussion

16.	the position (x) of a particle moving along x-axis varies with time (t) as x=t^{2 - 4t +5. The particle turns around at time?
Answer» the position (x) of a particle moving along x-axis varies with time (t) as x=t^{2 - 4t +5. The particle turns around at time?

Discussion

17.	The velocity of photon is proportional to (where vis frequency)
Answer» The velocity of photon is proportional to (where vis frequency)

Discussion

18.	A T joint is formed by two identical rods A and B each of mass M and length L in the X Y plane .it's moment of inertia about axis coinciding with A is.
Answer» A T joint is formed by two identical rods A and B each of mass M and length L in the X Y plane .it's moment of inertia about axis coinciding with A is.

Discussion

19.	A gun with a mount is placed on a smooth horizontal surface. The mount is attached with a light spring of spring constant k. The mass of bullet is m and mass of gun and mount is M. If a bullet is fired with velocity v horizontally, then maximum compression of spring is [given M>>m]
Answer» A gun with a mount is placed on a smooth horizontal surface. The mount is attached with a light spring of spring constant k. The mass of bullet is m and mass of gun and mount is M. If a bullet is fired with velocity v horizontally, then maximum compression of spring is [given M>>m]

Discussion

20.	A discrete time system impulse response h(n)=(15)nu(n). If system difference equation is h(n)−C.h(n−1)=δ(n), then the value of C is _______.0.2
Answer» A discrete time system impulse response $h (n) = {(\frac{1}{5})}^{n} u (n) .$ If system difference equation is $h (n) - C . h (n - 1) = δ (n),$ then the value of C is _______. 0.2

Discussion

21.	A string is wrapped on a wheel of moment of inertia 0.20 kg−m2 and radius 10 cm and goes through a light pulley to support a block of mass 2.0 kg as shown in figure (10-E5). Find the acceleration of the block.
Answer» A string is wrapped on a wheel of moment of inertia 0.20 $k g - m^{2}$ and radius 10 cm and goes through a light pulley to support a block of mass 2.0 kg as shown in figure (10-E5). Find the acceleration of the block.

21.

A string is wrapped on a wheel of moment of inertia 0.20 kg−m2 and radius 10 cm and goes through a light pulley to support a block of mass 2.0 kg as shown in figure (10-E5). Find the acceleration of the block.

Answer»

A string is wrapped on a wheel of moment of inertia 0.20 $k g - m^{2}$ and radius 10 cm and goes through a light pulley to support a block of mass 2.0 kg as shown in figure (10-E5). Find the acceleration of the block.

Discussion

22.	10. Two identical balls are simultaneously thrown towardseach other from points P and Q horizontally separatedby 8 m, and situated at heights 4 m and 8 m above theground. One ball is thrown from P horizontally with aspeed of 8 mswhile the other is thrown downwardwith an initial speed of v at an angle of 45^° to thehorizontal (figure). The two balls collide in space,calculate (a) the initial speed of ball thrown from thepoint Q, (b) coordinates of the point of collision.g= 10 ms2.Q
Answer» 10. Two identical balls are simultaneously thrown towardseach other from points P and Q horizontally separatedby 8 m, and situated at heights 4 m and 8 m above theground. One ball is thrown from P horizontally with aspeed of 8 mswhile the other is thrown downwardwith an initial speed of v at an angle of 45^° to thehorizontal (figure). The two balls collide in space,calculate (a) the initial speed of ball thrown from thepoint Q, (b) coordinates of the point of collision.g= 10 ms2.Q

Discussion

23.	A particle is moving in a straight line with a constant acceleration. It changes its velocity from 10 ms to 20ms in ‘t’ second. If the displacement of the particle during this interval is 135 m, the value of ‘t’ is
Answer» A particle is moving in a straight line with a constant acceleration. It changes its velocity from 10 $\frac{m}{s}$ to 20 $\frac{m}{s}$ in ‘t’ second. If the displacement of the particle during this interval is 135 m, the value of ‘t’ is

Discussion

24.	Calculate the time period of a pendulum whose lengthof string is 2r and a solid ball of radius 5r is connectedto one end.
Answer» Calculate the time period of a pendulum whose lengthof string is 2r and a solid ball of radius 5r is connectedto one end.

Discussion

25.	Is momentum the force required to stop a moving body which is equal to mass *velocity
Answer» Is momentum the force required to stop a moving body which is equal to mass *velocity

Discussion

26.	A block of 200 g mass moves with a uniform speed in a horizontal circular groove of radius 20 cm, with vertical side walls. If the block takes 40 s to complete one round, the normal force by the side walls of the groove is:
Answer» A block of $200 g$ mass moves with a uniform speed in a horizontal circular groove of radius $20 cm$ , with vertical side walls. If the block takes $40 s$ to complete one round, the normal force by the side walls of the groove is:

Discussion

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

Discussion

28.	A satellite of mass m, revolving in a circular orbit of radius r around the earth of mass M has magnitude of total energy E. Then its angular momentum will be
Answer» A satellite of mass $m$ , revolving in a circular orbit of radius $r$ around the earth of mass $M$ has magnitude of total energy $E$ . Then its angular momentum will be

Discussion

29.	In a Young's double slit experiment, the fringes are displaced by a distance x when a glass plate of refractive index 1.5 is introduced in the path of one of the beams. When this plate is replaced by another plate of same thickness, the shift of fringes is (3/2)x. The refractive index of second plate is
Answer» In a Young's double slit experiment, the fringes are displaced by a distance $x$ when a glass plate of refractive index $1.5$ is introduced in the path of one of the beams. When this plate is replaced by another plate of same thickness, the shift of fringes is $(3 / 2) x$ . The refractive index of second plate is

Discussion

30.	A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is
Answer» A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is

30.

A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is

Answer»

A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as

shown in the figure. Magnetic field produced at the centre of the loop is

Discussion

31.	Complete the data of the table given below with the help of the distance-time graph given in figure.
Answer» Complete the data of the table given below with the help of the distance-time graph given in figure.

Discussion

32.	Two massesm1 and m2 (m1 < m2) are released from rest from a finite distance. They start under their mutual gravitational attraction-
Answer» Two masses $m_{1}$ and $m_{2}$ ( $m_{1}$ $<$ $m_{2}$ ) are released from rest from a finite distance. They start under their mutual gravitational attraction-

Discussion

33.	A small source of sound vibrating at frequency 500 Hz is rotated in a circle of radius 100/π cm at a constant angular speed of 5.0 revolutions per second. A listener situation situates himself in the plane of the circle. Find the minimum and the maximum frequency of the sound observed. Speed of sound in air = 332 m s−1.(is angular speed 10 pi?)
Answer» A small source of sound vibrating at frequency 500 Hz is rotated in a circle of radius 100/π cm at a constant angular speed of 5.0 revolutions per second. A listener situation situates himself in the plane of the circle. Find the minimum and the maximum frequency of the sound observed. Speed of sound in air = 332 m s−1. (is angular speed 10 pi?)

Discussion

34.	The wavelength of radiation emitted is Y when an electron jumps from third to second orbit of hydrogen atom for the electron to jump from the fourth to the second orbit of the hydrogen atom the wavelength of radiation emitted will be
Answer» The wavelength of radiation emitted is Y when an electron jumps from third to second orbit of hydrogen atom for the electron to jump from the fourth to the second orbit of the hydrogen atom the wavelength of radiation emitted will be

Discussion

35.	Find the value of n such that, (1) np5=42np3,n>4 (2) np4÷ n-1p4 =5÷3,n>4 ?
Answer» Find the value of n such that, (1) np5=42np3,n>4 (2) np4÷ n-1p4 =5÷3,n>4 ?

Discussion

36.	Two slits in Young's experiment have widths in the ratio 81 : 1. What is the ratio of the amplitudes of light waves coming from them?
Answer» Two slits in Young's experiment have widths in the ratio 81 : 1. What is the ratio of the amplitudes of light waves coming from them?

Discussion

37.	On the surface of the earth, at a point on its magnetic equator, the earth's magnetic field induction B is measured to be 4×10^-5. With this value of B the magnetic moment of the earth's magnet is calculated theoretically which comes out to be 2^x×10^17. The value of x
Answer» On the surface of the earth, at a point on its magnetic equator, the earth's magnetic field induction B is measured to be 4×10^-5. With this value of B the magnetic moment of the earth's magnet is calculated theoretically which comes out to be 2^x×10^17. The value of x

Discussion

38.	What will be the magnitude of electric field at point O as shown in figure? Each side of the figure is l and perpendicular to each other ?
Answer» What will be the magnitude of electric field at point $O$ as shown in figure? Each side of the figure is $l$ and perpendicular to each other ?

Discussion

39.	a stone is tied to the other end of light string of length l and made to rotate on vertical circle keeping other end at centre.if speed of stone at highest point is v>\sqrt{gl
Answer» a stone is tied to the other end of light string of length l and made to rotate on vertical circle keeping other end at centre.if speed of stone at highest point is v>\sqrt{gl

Discussion

40.	A large open tank has two holes in the wall. One is a square hole of side L, at a depth y from the top and the other is a circular hole of radius R, at a depth 4y from the top. When the tank is completely filled with water, the quantity of water flowing out per second, from both the holes, is the same. Then R is equal to,
Answer» A large open tank has two holes in the wall. One is a square hole of side $L$ , at a depth $y$ from the top and the other is a circular hole of radius $R$ , at a depth $4 y$ from the top. When the tank is completely filled with water, the quantity of water flowing out per second, from both the holes, is the same. Then $R$ is equal to,

Discussion

41.	.A police van moving with a speed of V_o km/h on theroad fires a bullet at a thiefs car speeding away inthe same direction with a speed 6V_o, km/h. If the muzzle speed of the bullet is 20V_o km/h, then the speed of the bullet by which it hits the thiefs car is(1)15V_o(2)V_o(3)2V_o(4)13V_{
Answer» .A police van moving with a speed of V_o km/h on theroad fires a bullet at a thiefs car speeding away inthe same direction with a speed 6V_o, km/h. If the muzzle speed of the bullet is 20V_o km/h, then the speed of the bullet by which it hits the thiefs car is(1)15V_o(2)V_o(3)2V_o(4)13V_{

Discussion

42.	Find the second orderderivatives of the function.
Answer» Find the second order derivatives of the function.

42.

Find the second orderderivatives of the function.

Answer»

Find the second order
derivatives of the function.

Discussion

43.	If specific resistance and area of cross section of a Potentiomerter wire are p and A and I is the current flowing through it, then potential gradient is
Answer» If specific resistance and area of cross section of a Potentiomerter wire are p and A and I is the current flowing through it, then potential gradient is

Discussion

44.	8 1 uniform rope of length 4 metre and mass 6 kg is being pulled by a 30 Newton and 15 Newton force what is the tension in the Rope at point P 1.5 metre away from end a
Answer» 8 1 uniform rope of length 4 metre and mass 6 kg is being pulled by a 30 Newton and 15 Newton force what is the tension in the Rope at point P 1.5 metre away from end a

Discussion

45.	A fly wheel of mass 140 kg and radius 3 m is rotating at 240 rpm. The angular acceleration of flywheel if it comes to rest, after 7 rotations is (Assume constant angular acceleration)
Answer» A fly wheel of mass $140 kg$ and radius $3 m$ is rotating at $240 rpm$ . The angular acceleration of flywheel if it comes to rest, after $7$ rotations is (Assume constant angular acceleration)

Discussion

46.	In the given constraint, if the pulley is frictionless and the string is inextensible, then velocity of block B (VB) is
Answer» In the given constraint, if the pulley is frictionless and the string is inextensible, then velocity of block $B$ $(V_{B})$ is

Discussion

47.	Two small spherws each carrying a charge q are placed 1m apart. the ecpectric force between them is
Answer» Two small spherws each carrying a charge q are placed 1m apart. the ecpectric force between them is

Discussion

48.	If the bar magnet in exercise 5.13 is turned around by 180°, where will the new null points be located?
Answer» If the bar magnet in exercise 5.13 is turned around by 180°, where will the new null points be located?

Discussion

49.	The equation of an alternating voltage is V 100root2sin 100pit volt. The RMS value of voltage and frequencywill be respectively(1) 100 V, 50 Hz(2) 50 V, 100 Hz(3) 150 V, 50 Hz(4) 200 V, 50 Hz
Answer» The equation of an alternating voltage is V 100root2sin 100pit volt. The RMS value of voltage and frequencywill be respectively(1) 100 V, 50 Hz(2) 50 V, 100 Hz(3) 150 V, 50 Hz(4) 200 V, 50 Hz

Discussion

50.	98.A thin disc of mass 9M and radius R from which a disc of radius is cut.Moment of inertia of the disc about an axis passing through O and perpendicular to the plane of disc is
Answer» 98.A thin disc of mass 9M and radius R from which a disc of radius is cut.Moment of inertia of the disc about an axis passing through O and perpendicular to the plane of disc is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

20l%(w/v)NaOH.Density of solution 1.6g/ml.calculate molarity and molality. Calculate the total charge present in 14gm of N3-

explain by plotting a graph bewtween photocurrent and potential that how all photoelectrons does not have same kinetic energy while having same value of stopping potential

The sensitivity of a moving coil galvanometer is S. If a shunt of (18)th of the resistance of the galvanometer is connected to the moving coil galvanometer, its sensitivity becomes:

The angle made by the moon on an astronomical telescope is 0.1 rad. Focal length of the objective lens and the eyepiece of the telescope are 10 cm and 5 cm respectively. Find the angle subtended by the final image at the eyepiece, in case of the least strain on the eye.

Two buildings are 20m and 25m high. If the buildings are 12m apart, find the distance between their tops.undefinedundefinedundefinedundefined

The frequency of a radar is 780 MHz. After getting reflected from an approaching aeroplane, the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of

A capacitor initially given a charge Qo is connected across a resistor R at t=0. The separation between the plates changes according to, d=do1+t (0≤t&lt;1).. The variation of charge with time is Qo(x+t)−1/RCo. The value of x is ______.

The current in a conductor varies with time t as I=3t+4t2,where I in ampere and t in seconds. The elelctric charge flows through the section of the conductor between t=1 s and t=3 s is n3C. Here value of n is

baurnouli's eqation

41. The area of the acceleration-displacement curve of a body gives 1. Impulse 2. Change in momentum per unit mass 3. Change in KE per unit mass 4. Total change in energy

A projectile is fired at an angle theta with velocity u. At the top of it's trajectory it explodes into two parts of equal masses. One of them moves vertically upwards with velocity ucos theta . Find out velocity of the other part.

If the magnetic field is parallel to a surface then the magnetic flux through the surface is

A solenoid of inductance 50 mH and resistance 10 Ω is connected to a battery of 6 V. The time elapsed before the current acquires half of its steady state value from zero is-(ln2=0.693)

the position (x) of a particle moving along x-axis varies with time (t) as x=t^{2 - 4t +5. The particle turns around at time?

The velocity of photon is proportional to (where vis frequency)

A T joint is formed by two identical rods A and B each of mass M and length L in the X Y plane .it's moment of inertia about axis coinciding with A is.

A gun with a mount is placed on a smooth horizontal surface. The mount is attached with a light spring of spring constant k. The mass of bullet is m and mass of gun and mount is M. If a bullet is fired with velocity v horizontally, then maximum compression of spring is [given M>>m]

A discrete time system impulse response h(n)=(15)nu(n). If system difference equation is h(n)−C.h(n−1)=δ(n), then the value of C is _______.0.2

A string is wrapped on a wheel of moment of inertia 0.20 kg−m2 and radius 10 cm and goes through a light pulley to support a block of mass 2.0 kg as shown in figure (10-E5). Find the acceleration of the block.

A particle is moving in a straight line with a constant acceleration. It changes its velocity from 10 ms to 20ms in ‘t’ second. If the displacement of the particle during this interval is 135 m, the value of ‘t’ is

Calculate the time period of a pendulum whose lengthof string is 2r and a solid ball of radius 5r is connectedto one end.

Is momentum the force required to stop a moving body which is equal to mass *velocity

A block of 200 g mass moves with a uniform speed in a horizontal circular groove of radius 20 cm, with vertical side walls. If the block takes 40 s to complete one round, the normal force by the side walls of the groove is:

A satellite of mass m, revolving in a circular orbit of radius r around the earth of mass M has magnitude of total energy E. Then its angular momentum will be

A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is

Complete the data of the table given below with the help of the distance-time graph given in figure.

Two massesm1 and m2 (m1 &lt; m2) are released from rest from a finite distance. They start under their mutual gravitational attraction-

The wavelength of radiation emitted is Y when an electron jumps from third to second orbit of hydrogen atom for the electron to jump from the fourth to the second orbit of the hydrogen atom the wavelength of radiation emitted will be

Find the value of n such that, (1) np5=42np3,n>4 (2) np4÷ n-1p4 =5÷3,n>4 ?

Two slits in Young's experiment have widths in the ratio 81 : 1. What is the ratio of the amplitudes of light waves coming from them?

On the surface of the earth, at a point on its magnetic equator, the earth's magnetic field induction B is measured to be 4×10^-5. With this value of B the magnetic moment of the earth's magnet is calculated theoretically which comes out to be 2^x×10^17. The value of x

What will be the magnitude of electric field at point O as shown in figure? Each side of the figure is l and perpendicular to each other ?

a stone is tied to the other end of light string of length l and made to rotate on vertical circle keeping other end at centre.if speed of stone at highest point is v>\sqrt{gl

.A police van moving with a speed of V_o km/h on theroad fires a bullet at a thiefs car speeding away inthe same direction with a speed 6V_o, km/h. If the muzzle speed of the bullet is 20V_o km/h, then the speed of the bullet by which it hits the thiefs car is(1)15V_o(2)V_o(3)2V_o(4)13V_{

Find the second orderderivatives of the function.

If specific resistance and area of cross section of a Potentiomerter wire are p and A and I is the current flowing through it, then potential gradient is

8 1 uniform rope of length 4 metre and mass 6 kg is being pulled by a 30 Newton and 15 Newton force what is the tension in the Rope at point P 1.5 metre away from end a

A fly wheel of mass 140 kg and radius 3 m is rotating at 240 rpm. The angular acceleration of flywheel if it comes to rest, after 7 rotations is (Assume constant angular acceleration)

In the given constraint, if the pulley is frictionless and the string is inextensible, then velocity of block B (VB) is

Two small spherws each carrying a charge q are placed 1m apart. the ecpectric force between them is

If the bar magnet in exercise 5.13 is turned around by 180°, where will the new null points be located?

The equation of an alternating voltage is V 100root2sin 100pit volt. The RMS value of voltage and frequencywill be respectively(1) 100 V, 50 Hz(2) 50 V, 100 Hz(3) 150 V, 50 Hz(4) 200 V, 50 Hz

98.A thin disc of mass 9M and radius R from which a disc of radius is cut.Moment of inertia of the disc about an axis passing through O and perpendicular to the plane of disc is

A capacitor initially given a charge Qo is connected across a resistor R at t=0. The separation between the plates changes according to, d=do1+t (0≤t<1).. The variation of charge with time is Qo(x+t)−1/RCo. The value of x is ______.

Two massesm1 and m2 (m1 < m2) are released from rest from a finite distance. They start under their mutual gravitational attraction-