50278 + Interview Questions in Physics

1.	The bob of a simple pendulum has mass 40 grams and positive charge 410 to power -6 C . It makes 20 oscillations in 45 seconds . A vertical electric field pointing upwards is switched on and is of magnitude 2.5 10 to power 4 NC-1 . How much time will it take to complete 20 oscillations ?
Answer» The bob of a simple pendulum has mass 40 grams and positive charge 410 to power -6 C . It makes 20 oscillations in 45 seconds . A vertical electric field pointing upwards is switched on and is of magnitude 2.5 10 to power 4 NC-1 . How much time will it take to complete 20 oscillations ?

Discussion

2.	Two bodies start moving in the same straight line at the same instant of time from the same origin. The first body moves with a constant velocity of 40 ms−1 and the second body start from rest with a constant acceleration of 40 ms2. The time that elapse before the second catches the first body is (in seconds)
Answer» Two bodies start moving in the same straight line at the same instant of time from the same origin. The first body moves with a constant velocity of $40 m s^{- 1}$ and the second body start from rest with a constant acceleration of $40 m s^{2}$ . The time that elapse before the second catches the first body is (in seconds)

Discussion

3.	A particle obeys the following v - t graph as shown. The average velocity over 30 s isv (m/s)10tB- 30 s0O't (s)(1)10 m/s(2) 5 m/s15m/s3(4) Zero(3)
Answer» A particle obeys the following v - t graph as shown. The average velocity over 30 s isv (m/s)10tB- 30 s0O't (s)(1)10 m/s(2) 5 m/s15m/s3(4) Zero(3)

Discussion

4.	Young's double-slit experiment is conducted in water (μ1) as shown in figure, and a glass plate of thickness t and refractive index μ2 is placed in the path of S2. Find the magnitude of the phase difference at O. [Assume that λ is the wavelength of light in air]
Answer» Young's double-slit experiment is conducted in water $(μ_{1})$ as shown in figure, and a glass plate of thickness $t$ and refractive index $μ_{2}$ is placed in the path of $S_{2}$ . Find the magnitude of the phase difference at $O$ . [Assume that $λ$ is the wavelength of light in air]

Discussion

5.	Bode plot of a stable system is shown in figure The transfer function of the system is
Answer» Bode plot of a stable system is shown in figure The transfer function of the system is

Discussion

6.	A bomb is released from an aeroplane which is moving horizontally with a velocity 196 m/s at a height of 980 m from the ground. Find the velocity with which the bomb hits the ground.
Answer» A bomb is released from an aeroplane which is moving horizontally with a velocity $196 m/s$ at a height of $980 m$ from the ground. Find the velocity with which the bomb hits the ground.

Discussion

7.	12 g of an alkaline earth metal gives 14.8 g of itsnitride. Atomic weight of the metal is
Answer» 12 g of an alkaline earth metal gives 14.8 g of itsnitride. Atomic weight of the metal is

Discussion

8.	Velocity - time graph of a particle of mass 2 kg moving in a straight line is as shown in figure. Work done by all the forces on the particle is
Answer» Velocity - time graph of a particle of mass $2 kg$ moving in a straight line is as shown in figure. Work done by all the forces on the particle is

Discussion

9.	44.A satellite in force free space sweeps stationary interplanetary dust at a rate of dM/dt=alpha v,where M is mass and v is the speed of satellite and alpha is a contant.The tangential acceleration of satellite is:
Answer» 44.A satellite in force free space sweeps stationary interplanetary dust at a rate of dM/dt=alpha v,where M is mass and v is the speed of satellite and alpha is a contant.The tangential acceleration of satellite is:

Discussion

10.	The derivative of sin3x with respect to lnx is[2 marks]
Answer» The derivative of ${sin}^{3} x$ with respect to $ln x$ is [2 marks]

Discussion

11.	A car moving at a speed of 36 kmph−1 is taking a turn on a circular road of radius 50 m. A small wooden plate is kept on the seat with its plane perpendicular to the radius of the circular road. A small block of mass 100 g is kept on the seat which rests against the plate. Coefficient between the block and the plate is 0.58. The plate is slowly turned so that the angle between the normal to the plate and the radius of the road is slowly increased. Find the angle at which the block will just start sliding on the plate.
Answer» A car moving at a speed of ${36 kmph}^{- 1}$ is taking a turn on a circular road of radius $50 m$ . A small wooden plate is kept on the seat with its plane perpendicular to the radius of the circular road. A small block of mass $100 g$ is kept on the seat which rests against the plate. Coefficient between the block and the plate is $0.58$ . The plate is slowly turned so that the angle between the normal to the plate and the radius of the road is slowly increased. Find the angle at which the block will just start sliding on the plate.

Discussion

12.	48. AB is 1 meter long …wire of 10ohm resistance .the other data are shown in the circuit diagram.Calculate, a)potential gradient along AB and b)length AO of the wire ,when the galvanometer shows no deflection. Explain in detail each step
Answer» 48. AB is 1 meter long …wire of 10ohm resistance .the other data are shown in the circuit diagram.Calculate, a)potential gradient along AB and b)length AO of the wire ,when the galvanometer shows no deflection. Explain in detail each step

Discussion

13.	22.Why cathode ray shows fluorescence effect?
Answer» 22.Why cathode ray shows fluorescence effect?

Discussion

14.	Calculate the amount of energy required to stop an object of mass 2kg moving with speed 54km/h
Answer» Calculate the amount of energy required to stop an object of mass 2kg moving with speed 54km/h

Discussion

15.	Two charges q1 and q2 are placed 30cm apart, as shown in figure. A third charges q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is q34πϵ0k, where k is
Answer» Two charges $q_{1}$ and $q_{2}$ are placed 30cm apart, as shown in figure. A third charges $q_{3}$ is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is $\frac{q_{3}}{4 π ϵ_{0}} k$ , where k is

15.

Two charges q1 and q2 are placed 30cm apart, as shown in figure. A third charges q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is q34πϵ0k, where k is

Answer»

Two charges $q_{1}$ and $q_{2}$ are placed 30cm apart, as shown in figure. A third charges $q_{3}$ is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is $\frac{q_{3}}{4 π ϵ_{0}} k$ , where k is

Discussion

16.	Find radius of He+ ion in its second excited state (assume Bohr's model is applicable)
Answer» Find radius of $H e^{+}$ ion in its second excited state (assume Bohr's model is applicable)

Discussion

17.	A heavy plank of mass 100 kg hangs on three vertical wires of equal length arranged symmetrically (see fig.). The middle wire is of steel and the other two are of copper. All the wires have the same cross-section. The modulus of elasticity of steel is twice that of copper. The tensions in the copper and steel wires are respectively
Answer» A heavy plank of mass 100 kg hangs on three vertical wires of equal length arranged symmetrically (see fig.). The middle wire is of steel and the other two are of copper. All the wires have the same cross-section. The modulus of elasticity of steel is twice that of copper. The tensions in the copper and steel wires are respectively

17.

A heavy plank of mass 100 kg hangs on three vertical wires of equal length arranged symmetrically (see fig.). The middle wire is of steel and the other two are of copper. All the wires have the same cross-section. The modulus of elasticity of steel is twice that of copper. The tensions in the copper and steel wires are respectively

Answer»

A heavy plank of mass 100 kg hangs on three vertical wires of equal length arranged symmetrically (see fig.). The middle wire is of steel and the other two are of copper. All the wires have the same cross-section. The modulus of elasticity of steel is twice that of copper. The tensions in the copper and steel wires are respectively

Discussion

18.	In a wire of length 1 m and diameter 1.5 mm a potential difference of 5 mV is applieds between its two ends and the current through it is 500 mA determine the specific resistance for the material of the wire.
Answer» In a wire of length 1 m and diameter 1.5 mm a potential difference of 5 mV is applieds between its two ends and the current through it is 500 mA determine the specific resistance for the material of the wire.

Discussion

19.	Two particles P and Q move in a straight line towards each other at initial velocities v1 and v2 and with constant accelerations a1 and a2 directed against the corresponding velocities at the initial instant. What must be the maximum initial separation between them for which they meet during the motion ?
Answer» Two particles P and Q move in a straight line towards each other at initial velocities v1 and v2 and with constant accelerations a1 and a2 directed against the corresponding velocities at the initial instant. What must be the maximum initial separation between them for which they meet during the motion ?

Discussion

20.	A point charge of magnitude 1µC is fixed at (0, 0, 0). An isolated uncharged spherical conductor is fixed with its centre at (4 cm, 0, 0). What is the potential and the induced electric field at the centre of the sphere? Please also explain why the electric field inside the sphere won't be 0.
Answer» A point charge of magnitude 1µC is fixed at (0, 0, 0). An isolated uncharged spherical conductor is fixed with its centre at (4 cm, 0, 0). What is the potential and the induced electric field at the centre of the sphere? Please also explain why the electric field inside the sphere won't be 0.

Discussion

21.	Four identical rods AB, CD ,CF and DE are connected as shown in figure. The length, cross-sectional area and thermal conductivity of each rod are L, A, K respectively. The ends A, E, F are maintained at temperature T1, T2 and T3 respectively. Assuming no loss of heat to the atmosphere, calculate the temperature at B [CB=BD].(Consider T3 as higher temperature)
Answer» Four identical rods $A B, C D, C F$ and $D E$ are connected as shown in figure. The length, cross-sectional area and thermal conductivity of each rod are $L, A, K$ respectively. The ends $A, E, F$ are maintained at temperature $T_{1}, T_{2}$ and $T_{3}$ respectively. Assuming no loss of heat to the atmosphere, calculate the temperature at $B [C B = B D]$ . (Consider $T_{3}$ as higher temperature)

Discussion

22.	What is polarised light?
Answer» What is polarised light?

Discussion

23.	The displacement of a particle moving in a straight line is described as s=6+12t-2t^2 . The distance travelled by the particle in first 5s is-
Answer» The displacement of a particle moving in a straight line is described as s=6+12t-2t^2 . The distance travelled by the particle in first 5s is-

Discussion

24.	16.How resistivity affact by tempreture?
Answer» 16.How resistivity affact by tempreture?

Discussion

25.	There exists a uniform electric field E=4×105Vm−1 directed along negative x-axis. A charge of is placed −200μC at the origin, and a charge +200μC of is placed at (3m,0). Find the electrostatic potential energy of the dipole system.
Answer» There exists a uniform electric field $E = 4 \times 10^{5} V m^{- 1}$ directed along negative x-axis. A charge of is placed $- 200 μ C$ at the origin, and a charge $+ 200 μ C$ of is placed at (3m,0). Find the electrostatic potential energy of the dipole system.

Discussion

26.	Find the value of current i in the circuit. (Consider diodes to be ideal.)
Answer» Find the value of current $i$ in the circuit. (Consider diodes to be ideal.)

Discussion

27.	48. What is meant by wavefront? Also,what happens in reflection with phase?
Answer» 48. What is meant by wavefront? Also,what happens in reflection with phase?

Discussion

28.	two metal spheres of radii a and b are connected by a thin wire. their seperation is very large compared to their dimensions the capaci†an ce of this system i
Answer» two metal spheres of radii a and b are connected by a thin wire. their seperation is very large compared to their dimensions the capaci†an ce of this system i

Discussion

29.	A solid body starts rotating about a stationary axis with an angular acceleration = at. How soon after the beginning of rotation will the total acceleration vector of an arbitrary point of the body form an angle = 60∘ with its velocity vector?
Answer» A solid body starts rotating about a stationary axis with an angular acceleration = $a t$ . How soon after the beginning of rotation will the total acceleration vector of an arbitrary point of the body form an angle = $60^{\circ}$ with its velocity vector?

Discussion

30.	Figure6.20 shows a metal rod PQ resting on the smooth rails AB andpositioned between the poles of a permanent magnet. The rails, therod, and the magnetic field are in three mutual perpendiculardirections. A galvanometer G connects the rails through a switch K.Length of the rod = 15 cm, B =0.50 T, resistance of the closed loop containing the rod = 9.0mΩ. Assumethe field to be uniform.(a) SupposeK is open and the rod is moved with a speed of 12 cm s−1in the direction shown. Give the polarity and magnitude of theinduced emf.(b) Isthere an excess charge built up at the ends of the rods whenKis open? What if K is closed? (c) With Kopen and the rod moving uniformly, there is nonet force on the electrons in therod PQ even though they do experience magnetic force due to themotion of the rod. Explain.(d) Whatis the retarding force on the rod when K is closed?(e) Howmuch power is required (by an external agent) to keep the rod movingat the same speed (=12 cm s−1)when K is closed? How much power is required when K is open?(f) Howmuch power is dissipated as heat in the closed circuit?Whatis the source of this power?(g) Whatis the induced emf in the moving rod if the magnetic field isparallel to the rails instead of being perpendicular?
Answer» Figure 6.20 shows a metal rod PQ resting on the smooth rails AB and positioned between the poles of a permanent magnet. The rails, the rod, and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0 mΩ. Assume the field to be uniform. (a) Suppose K is open and the rod is moved with a speed of 12 cm s⁻¹ in the direction shown. Give the polarity and magnitude of the induced emf. (b) Is there an excess charge built up at the ends of the rods when K is open? What if K is closed? (c) With K open and the rod moving uniformly, there is no net force on the electrons in the rod PQ even though they do experience magnetic force due to the motion of the rod. Explain. (d) What is the retarding force on the rod when K is closed? (e) How much power is required (by an external agent) to keep the rod moving at the same speed (=12 cm s⁻¹) when K is closed? How much power is required when K is open? (f) How much power is dissipated as heat in the closed circuit? What is the source of this power? (g) What is the induced emf in the moving rod if the magnetic field is parallel to the rails instead of being perpendicular?

30.

Figure6.20 shows a metal rod PQ resting on the smooth rails AB andpositioned between the poles of a permanent magnet. The rails, therod, and the magnetic field are in three mutual perpendiculardirections. A galvanometer G connects the rails through a switch K.Length of the rod = 15 cm, B =0.50 T, resistance of the closed loop containing the rod = 9.0mΩ. Assumethe field to be uniform.(a) SupposeK is open and the rod is moved with a speed of 12 cm s−1in the direction shown. Give the polarity and magnitude of theinduced emf.(b) Isthere an excess charge built up at the ends of the rods whenKis open? What if K is closed? (c) With Kopen and the rod moving uniformly, there is nonet force on the electrons in therod PQ even though they do experience magnetic force due to themotion of the rod. Explain.(d) Whatis the retarding force on the rod when K is closed?(e) Howmuch power is required (by an external agent) to keep the rod movingat the same speed (=12 cm s−1)when K is closed? How much power is required when K is open?(f) Howmuch power is dissipated as heat in the closed circuit?Whatis the source of this power?(g) Whatis the induced emf in the moving rod if the magnetic field isparallel to the rails instead of being perpendicular?

Answer»

Figure
6.20 shows a metal rod PQ resting on the smooth rails AB and
positioned between the poles of a permanent magnet. The rails, the
rod, and the magnetic field are in three mutual perpendicular
directions. A galvanometer G connects the rails through a switch K.
Length of the rod = 15 cm, B =
0.50 T, resistance of the closed loop containing the rod = 9.0
mΩ. Assume
the field to be uniform.

(a) Suppose
K is open and the rod is moved with a speed of 12 cm s⁻¹
in the direction shown. Give the polarity and magnitude of the
induced emf.

(b) Is
there an excess charge built up at the ends of the rods when

K
is open? What if K is closed?

(c) With K
open and the rod moving uniformly, there is no
net force on the electrons in the
rod PQ even though they do experience magnetic force due to the
motion of the rod. Explain.

(d) What
is the retarding force on the rod when K is closed?

(e) How
much power is required (by an external agent) to keep the rod moving
at the same speed (=12 cm s⁻¹)
when K is closed? How much power is required when K is open?

(f) How
much power is dissipated as heat in the closed circuit?

What
is the source of this power?

(g) What
is the induced emf in the moving rod if the magnetic field is
parallel to the rails instead of being perpendicular?

Discussion

31.	The torque about the point of projection of a projectile, when the velocity of particle becomes perpendicular to the direction of initial velocity, is1. mu2sin theta2. mu2 cos theta3. mu2 tan theta4. mu2 cot theta
Answer» The torque about the point of projection of a projectile, when the velocity of particle becomes perpendicular to the direction of initial velocity, is 1. mu2sin theta 2. mu2 cos theta 3. mu2 tan theta 4. mu2 cot theta

Discussion

32.	Three persons P,Q and R are at three corners of an equilateral triangle of each side a. They start moving simultaneously with velocity V such that P always moves towards Q, Q always moves towards R and R always moves towards P. After what time they would meet each other at O ?
Answer» Three persons $P, Q$ and $R$ are at three corners of an equilateral triangle of each side $a$ . They start moving simultaneously with velocity $V$ such that $P$ always moves towards $Q$ , $Q$ always moves towards $R$ and $R$ always moves towards $P$ . After what time they would meet each other at $O$ ?

Discussion

33.	92.A bullet of mass 0.02 kg travelling at a speed of 150m/s it can penetrate in box of mass 2 kg . The bullet stop at a distance of 4cm .What should be the velocity of bullet so that it could stop at a distance of 16cm in box ?
Answer» 92.A bullet of mass 0.02 kg travelling at a speed of 150m/s it can penetrate in box of mass 2 kg . The bullet stop at a distance of 4cm .What should be the velocity of bullet so that it could stop at a distance of 16cm in box ?

Discussion

34.	What are the dimensions of K (coulomb’s law constant)?
Answer» What are the dimensions of K (coulomb’s law constant)?

Discussion

35.	16. Point A on the rod AB has an acceleration of 5 m/s and a velocity of 6 m/s at an instant as shown in the figure. The acceleration of the end B at the same moment is:
Answer» 16. Point A on the rod AB has an acceleration of 5 m/s and a velocity of 6 m/s at an instant as shown in the figure. The acceleration of the end B at the same moment is:

Discussion

36.	Question 9Which of the following represents voltage?(a) Work doneCurrent×Time(b) Work done×Charge(c) Work done×TimeCurrent(d) Work done×Charge×Time
Answer» Question 9 Which of the following represents voltage? (a) $\frac{W o r k d o n e}{C u r r e n t \times T i m e}$ (b) $W o r k d o n e \times C h a r g e$ (c) $W o r k d o n e \times \frac{T i m e}{C u r r e n t}$ (d) $W o r k d o n e \times C h a r g e \times T i m e$

Discussion

37.	A moving iron ammeter has constant rate of change of inductance with respect to deflection equal to 3μH/degree. The control torque is provided by spring having spring constant equal to 4×10−7N−m/degree. If the maximum deflection of pointer is 120°, then current corresponding to this maximum deflection will be _______A.5.66
Answer» A moving iron ammeter has constant rate of change of inductance with respect to deflection equal to $3 μ H / d e g r e e .$ The control torque is provided by spring having spring constant equal to $4 \times 10^{- 7} N - m / d e g r e e .$ If the maximum deflection of pointer is 120°, then current corresponding to this maximum deflection will be _______A. 5.66

Discussion

38.	In the figure shown, there is no relative motionbetween the two blocks. Force of friction acting on 1 kg block is
Answer» In the figure shown, there is no relative motion between the two blocks. Force of friction acting on 1 kg block is

38.

In the figure shown, there is no relative motionbetween the two blocks. Force of friction acting on 1 kg block is

Answer»

In the figure shown, there is no relative motion
between the two blocks. Force of friction acting on 1 kg block is

Discussion

39.	A raindrop of radius 0.2 mm falls through air. If the viscosity of air is 18×10–6 Pl, if the viscous drag acting on the drop when its speed is 1 ms–1 is 67.8×10–p newton, then find p
Answer» A raindrop of radius 0.2 mm falls through air. If the viscosity of air is $18 \times 10^{- 6} P l,$ if the viscous drag acting on the drop when its speed is $1 m s^{- 1} is 67.8 \times 10^{- p}$ newton, then find p

Discussion

40.	What is the degree of the polynomial x2(x3)2 ?
Answer» What is the degree of the polynomial $x^{2} (x^{3})^{2}$ ?

Discussion

41.	Minimum number of 8 micro Faraday and 250 V capacitors are used to make a combination of 16 micro Faraday and 1000 V are
Answer» Minimum number of 8 micro Faraday and 250 V capacitors are used to make a combination of 16 micro Faraday and 1000 V are

Discussion

42.	An α particle moves in circular orbit a of radius 1.4 cm in a magnetic field of 6.6 T. Find the deBroglie wavelength associated with the particle.
Answer» An $α$ particle moves in circular orbit a of radius $1.4 c m$ in a magnetic field of $6.6 T$ . Find the deBroglie wavelength associated with the particle.

Discussion

43.	When a spring is stretched by 1 cm, it stores energy 50 J. If it is further stretched by 1 cm, the stored energy will increase by Options: a- 50 J b-100 J c- 150 J d- 200 J
Answer» When a spring is stretched by 1 cm, it stores energy 50 J. If it is further stretched by 1 cm, the stored energy will increase by Options: a- 50 J b-100 J c- 150 J d- 200 J

Discussion

44.	A block of mass M is kept on a rough horizontal surface . The coefficient of static friction between the block and the surface is n' . The block is to pulled by applying a force to it . What MINIMUM force is needed to slide the block? In which direction should this force act?
Answer» A block of mass M is kept on a rough horizontal surface . The coefficient of static friction between the block and the surface is n' . The block is to pulled by applying a force to it . What MINIMUM force is needed to slide the block? In which direction should this force act?

Discussion

45.	An emf of 20 V is applied at time t=0 to a circuit containing in series 10 mH inductor and 5 Ω resistor. The ratio of the current at time t=∞ and t=40 s is close to:(Take e2=7.389)
Answer» An emf of $20 V$ is applied at time $t = 0$ to a circuit containing in series $10 mH$ inductor and $5 Ω$ resistor. The ratio of the current at time $t = \infty$ and $t = 40 s$ is close to: (Take $e^{2} = 7.389$ )

Discussion

46.	50.Which of the following has higjest shielding power 1.s 2.p 3.d 4. f
Answer» 50.Which of the following has higjest shielding power 1.s 2.p 3.d 4. f

Discussion

47.	why does light 's speed changes when there is a change in medium?
Answer» why does light 's speed changes when there is a change in medium?

Discussion

48.	a particle of mass m moves with cons†an t speed v on a circular path of radius r.find magnitude of average foce on it in one fourth revolution
Answer» a particle of mass m moves with cons†an t speed v on a circular path of radius r.find magnitude of average foce on it in one fourth revolution

Discussion

49.	10.A voltmeter of 998 resistance is connected to a cell of 2 emf volts ,having internal resistance of 2 ohms ,the error in measuring emf will explain in detail
Answer» 10.A voltmeter of 998 resistance is connected to a cell of 2 emf volts ,having internal resistance of 2 ohms ,the error in measuring emf will explain in detail

Discussion

50.	8.A bulb of 50W 10V is operated t 100V supply. If bulb glows with full intensity then used resistance in series is ?
Answer» 8.A bulb of 50W 10V is operated t 100V supply. If bulb glows with full intensity then used resistance in series is ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The bob of a simple pendulum has mass 40 grams and positive charge 4*10 to power -6 C . It makes 20 oscillations in 45 seconds . A vertical electric field pointing upwards is switched on and is of magnitude 2.5 * 10 to power 4 NC-1 . How much time will it take to complete 20 oscillations ?

A particle obeys the following v - t graph as shown. The average velocity over 30 s isv (m/s)10tB- 30 s0O't (s)(1)10 m/s(2) 5 m/s15m/s3(4) Zero(3)

Young's double-slit experiment is conducted in water (μ1) as shown in figure, and a glass plate of thickness t and refractive index μ2 is placed in the path of S2. Find the magnitude of the phase difference at O. [Assume that λ is the wavelength of light in air]

Bode plot of a stable system is shown in figure The transfer function of the system is

A bomb is released from an aeroplane which is moving horizontally with a velocity 196 m/s at a height of 980 m from the ground. Find the velocity with which the bomb hits the ground.

12 g of an alkaline earth metal gives 14.8 g of itsnitride. Atomic weight of the metal is

Velocity - time graph of a particle of mass 2 kg moving in a straight line is as shown in figure. Work done by all the forces on the particle is

44.A satellite in force free space sweeps stationary interplanetary dust at a rate of dM/dt=alpha v,where M is mass and v is the speed of satellite and alpha is a contant.The tangential acceleration of satellite is:

The derivative of sin3x with respect to lnx is[2 marks]

48. AB is 1 meter long …wire of 10ohm resistance .the other data are shown in the circuit diagram.Calculate, a)potential gradient along AB and b)length AO of the wire ,when the galvanometer shows no deflection. Explain in detail each step

22.Why cathode ray shows fluorescence effect?

Calculate the amount of energy required to stop an object of mass 2kg moving with speed 54km/h

Two charges q1 and q2 are placed 30cm apart, as shown in figure. A third charges q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is q34πϵ0k, where k is

Find radius of He+ ion in its second excited state (assume Bohr's model is applicable)

In a wire of length 1 m and diameter 1.5 mm a potential difference of 5 mV is applieds between its two ends and the current through it is 500 mA determine the specific resistance for the material of the wire.

A point charge of magnitude 1µC is fixed at (0, 0, 0). An isolated uncharged spherical conductor is fixed with its centre at (4 cm, 0, 0). What is the potential and the induced electric field at the centre of the sphere? Please also explain why the electric field inside the sphere won't be 0.

What is polarised light?

The displacement of a particle moving in a straight line is described as s=6+12t-2t^2 . The distance travelled by the particle in first 5s is-

16.How resistivity affact by tempreture?

There exists a uniform electric field E=4×105Vm−1 directed along negative x-axis. A charge of is placed −200μC at the origin, and a charge +200μC of is placed at (3m,0). Find the electrostatic potential energy of the dipole system.

Find the value of current i in the circuit. (Consider diodes to be ideal.)

48. What is meant by wavefront? Also,what happens in reflection with phase?

two metal spheres of radii a and b are connected by a thin wire. their seperation is very large compared to their dimensions the capaci†an ce of this system i

A solid body starts rotating about a stationary axis with an angular acceleration = at. How soon after the beginning of rotation will the total acceleration vector of an arbitrary point of the body form an angle = 60∘ with its velocity vector?

The torque about the point of projection of a projectile, when the velocity of particle becomes perpendicular to the direction of initial velocity, is1. mu2sin theta2. mu2 cos theta3. mu2 tan theta4. mu2 cot theta

Three persons P,Q and R are at three corners of an equilateral triangle of each side a. They start moving simultaneously with velocity V such that P always moves towards Q, Q always moves towards R and R always moves towards P. After what time they would meet each other at O ?

92.A bullet of mass 0.02 kg travelling at a speed of 150m/s it can penetrate in box of mass 2 kg . The bullet stop at a distance of 4cm .What should be the velocity of bullet so that it could stop at a distance of 16cm in box ?

What are the dimensions of K (coulomb’s law constant)?

16. Point A on the rod AB has an acceleration of 5 m/s and a velocity of 6 m/s at an instant as shown in the figure. The acceleration of the end B at the same moment is:

Question 9Which of the following represents voltage?(a) Work doneCurrent×Time(b) Work done×Charge(c) Work done×TimeCurrent(d) Work done×Charge×Time

In the figure shown, there is no relative motionbetween the two blocks. Force of friction acting on 1 kg block is

A raindrop of radius 0.2 mm falls through air. If the viscosity of air is 18×10–6 Pl, if the viscous drag acting on the drop when its speed is 1 ms–1 is 67.8×10–p newton, then find p

What is the degree of the polynomial x2(x3)2 ?

Minimum number of 8 micro Faraday and 250 V capacitors are used to make a combination of 16 micro Faraday and 1000 V are

An α particle moves in circular orbit a of radius 1.4 cm in a magnetic field of 6.6 T. Find the deBroglie wavelength associated with the particle.

When a spring is stretched by 1 cm, it stores energy 50 J. If it is further stretched by 1 cm, the stored energy will increase by Options: a- 50 J b-100 J c- 150 J d- 200 J

A block of mass M is kept on a rough horizontal surface . The coefficient of static friction between the block and the surface is n' . The block is to pulled by applying a force to it . What MINIMUM force is needed to slide the block? In which direction should this force act?

An emf of 20 V is applied at time t=0 to a circuit containing in series 10 mH inductor and 5 Ω resistor. The ratio of the current at time t=∞ and t=40 s is close to:(Take e2=7.389)

50.Which of the following has higjest shielding power 1.s 2.p 3.d 4. f

why does light 's speed changes when there is a change in medium?

a particle of mass m moves with cons†an t speed v on a circular path of radius r.find magnitude of average foce on it in one fourth revolution

10.A voltmeter of 998 resistance is connected to a cell of 2 emf volts ,having internal resistance of 2 ohms ,the error in measuring emf will explain in detail

8.A bulb of 50W 10V is operated t 100V supply. If bulb glows with full intensity then used resistance in series is ?

The bob of a simple pendulum has mass 40 grams and positive charge 410 to power -6 C . It makes 20 oscillations in 45 seconds . A vertical electric field pointing upwards is switched on and is of magnitude 2.5 10 to power 4 NC-1 . How much time will it take to complete 20 oscillations ?