50278 + Interview Questions in Physics

1.	A cell of constant E.M.F. is applied across an inductor (Resistance is negligible). If rate of change of energy is R, then graph between R & t(time) is
Answer» A cell of constant E.M.F. is applied across an inductor (Resistance is negligible). If rate of change of energy is R, then graph between R & t(time) is

Discussion

2.	The instantaneous angular position of a point on a rotating wheel is given by the equation θ(t)=2t3−6t2. The torque on the wheel becomes zero at
Answer» The instantaneous angular position of a point on a rotating wheel is given by the equation $θ (t) = 2 t^{3} - 6 t^{2}$ . The torque on the wheel becomes zero at

Discussion

3.	A copper sphere is suspended in an evacuated chamber maintained at 300 K. The sphere is maintained at a constant temperature of 500 K by heating it electrically. A total of 300 W of electric power is needed to do it. When half of the surface of the copper sphere is completely blackened, 600 W is needed to maintain the same temperature of the sphere. Calculate the emissivity(e) of copper.
Answer» A copper sphere is suspended in an evacuated chamber maintained at $300 K$ . The sphere is maintained at a constant temperature of $500 K$ by heating it electrically. A total of $300 W$ of electric power is needed to do it. When half of the surface of the copper sphere is completely blackened, $600 W$ is needed to maintain the same temperature of the sphere. Calculate the emissivity(e) of copper.

Discussion

4.	The potential energy of a 1 kg particle free to move along the x− axis is given by V=(x44−x22) J The total mechanical energy of the particle is 2 J. Then the maximum speed is
Answer» The potential energy of a $1 kg$ particle free to move along the $x -$ axis is given by $V = (\frac{x^{4}}{4} - \frac{x^{2}}{2}) J$ The total mechanical energy of the particle is $2 J$ . Then the maximum speed is

Discussion

5.	When a cell is connected in the secondary circuit of a potentiometer, the balance length is found to be 810 cm. When the cell is shunted with a 5 Ω resistor, the balance length is found to be reduced to 675 cm. The internal resistance of the cell is
Answer» When a cell is connected in the secondary circuit of a potentiometer, the balance length is found to be 810 cm. When the cell is shunted with a 5 $Ω$ resistor, the balance length is found to be reduced to 675 cm. The internal resistance of the cell is

Discussion

6.	A beam of electromagnetic radiation of intensity 6.4× 10−5 W/cm2 is comprised of wavelength, λ=310 nm. It falls normally on a metal (work function ϕ=2 eV) of surface area 1 cm2. If one in 103 photons ejects an electron, total number of electrons ejected in 1s is 10x (hc=1240 eV−nm,1 eV=1.6×10−19 J), then x is
Answer» A beam of electromagnetic radiation of intensity 6.4 $\times 10^{- 5} W / c m^{2}$ is comprised of wavelength, $λ = 310 n m$ . It falls normally on a metal (work function $ϕ = 2 e V$ ) of surface area $1 c m^{2}$ . If one in $10^{3}$ photons ejects an electron, total number of electrons ejected in 1 $s$ is $10^{x}$ ( $h c = 1240 e V - n m, 1 e V = 1.6 \times 10^{- 19} J$ ), then x is

Discussion

7.	A smooth ring of mass m can slide on a fixed horizontal rod. A string tied to the ring passes over a fixed pulley B and carries a block C of mass as shown below. As the ring starts sliding.
Answer» A smooth ring of mass m can slide on a fixed horizontal rod. A string tied to the ring passes over a fixed pulley B and carries a block C of mass as shown below. As the ring starts sliding.

7.

A smooth ring of mass m can slide on a fixed horizontal rod. A string tied to the ring passes over a fixed pulley B and carries a block C of mass as shown below. As the ring starts sliding.

Answer»

A smooth ring of mass m can slide on a fixed horizontal rod. A string tied to the ring passes over a fixed pulley B and carries a block C of mass as shown below. As the ring starts sliding.

Discussion

8.	Two particles are in SHM with same angular frequency and with amplitudes of A and 2A respectively along same straight line with same mean position. They cross each other at position A/2 distance from mean position in opposite direction. The phase difference between them is (If sin−1(1/4)=14.48o)
Answer» Two particles are in SHM with same angular frequency and with amplitudes of $A$ and $2 A$ respectively along same straight line with same mean position. They cross each other at position A/2 distance from mean position in opposite direction. The phase difference between them is (If $s i n^{- 1} (1 / 4) = {14.48}^{o}$ )

Discussion

9.	Find the position (in cm) of the first minimum with respect to central maxima for a single slit of width 0.04 mm, on a screen 2 meters distant, when light from a He-Ne laser λ=632.8 nm shine on the slit. (Answer upto 2 decimal places)
Answer» Find the position (in cm) of the first minimum with respect to central maxima for a single slit of width $0.04 mm$ , on a screen 2 meters distant, when light from a He-Ne laser $λ = 632.8 nm$ shine on the slit. (Answer upto 2 decimal places)

Discussion

10.	A galvanometer having a coil of resistance 20Ω needs 20mA current for full scale deflection . In order to pass a maximum current of 2 A through the galvanometer, the resistance should be added as a shunt is(nearly)
Answer» A galvanometer having a coil of resistance 20 $Ω$ needs 20mA current for full scale deflection . In order to pass a maximum current of 2 A through the galvanometer, the resistance should be added as a shunt is(nearly)

Discussion

11.	Assertion : When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur Reason : Some energy disappears in the form of heat, sparking etc. Choose the most appropriate correct option:
Answer» Assertion : When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur Reason : Some energy disappears in the form of heat, sparking etc. Choose the most appropriate correct option:

11.

Assertion : When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur Reason : Some energy disappears in the form of heat, sparking etc. Choose the most appropriate correct option:

Answer»

Assertion : When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur

Reason : Some energy disappears in the form of heat, sparking etc.

Choose the most appropriate correct option:

Discussion

12.	The figure shows a part of a complete circuit. The potential difference VB–VA when the current I is 5A and is decreasing at a rate of 103 A s–1 is given by
Answer» The figure shows a part of a complete circuit. The potential difference $V_{B} - V_{A}$ when the current I is 5A and is decreasing at a rate of $10^{3}$ A $s^{- 1}$ is given by

12.

The figure shows a part of a complete circuit. The potential difference VB–VA when the current I is 5A and is decreasing at a rate of 103 A s–1 is given by

Answer»

The figure shows a part of a complete circuit. The potential difference $V_{B} - V_{A}$ when the current I is 5A and is decreasing at a rate of $10^{3}$ A $s^{- 1}$ is given by

Discussion

13.	An aircraft executes a horizontal loop with a speed of 150 m/s with its, wings banked at an angle of 120∘. The radius of the loop is (g=10 m/s2)
Answer» An aircraft executes a horizontal loop with a speed of 150 m/s with its, wings banked at an angle of $120^{\circ}$ . The radius of the loop is $(g = 10 m / s^{2})$

Discussion

14.	A mono-atomic ideal gas is compressed from volume V to V2 through various processes. For which of the following process final pressure will be maximum?
Answer» A mono-atomic ideal gas is compressed from volume V to $\frac{V}{2}$ through various processes. For which of the following process final pressure will be maximum?

Discussion

15.	An object is projected at an angle of 45∘ with the horizontal. The horizontal range and the maximum height reached will be in the ratio.
Answer» An object is projected at an angle of $45^{\circ}$ with the horizontal. The horizontal range and the maximum height reached will be in the ratio.

Discussion

16.	A sensor is exposed for time t to a lamp of power P at distance l. The sensor has an opening that is 4d in diameter. Assuming all of the energy is given off as light, the number of photons entering the sensor if the wavelength of the light is λ is
Answer» A sensor is exposed for time $t$ to a lamp of power $P$ at distance $l$ . The sensor has an opening that is 4 $d$ in diameter. Assuming all of the energy is given off as light, the number of photons entering the sensor if the wavelength of the light is $λ$ is

Discussion

17.	In an AC circuit, the voltage V and the current I are given by V=100 sin(100 π t) volt and I=100 sin [100t+π3]mA , The power dissipated in the circuit is
Answer» In an AC circuit, the voltage V and the current I are given by $V = 100 s i n (100 π t) v o l t a n d I = 100 s i n [100 t + \frac{π}{3}] m A$ , The power dissipated in the circuit is

Discussion

18.	Two particles of masses m and 2m having same charges q each are placed in a uniform electric field E and allowed to move for the same time. Find the ratio of their kinetic energies.
Answer» Two particles of masses $m$ and $2 m$ having same charges $q$ each are placed in a uniform electric field $E$ and allowed to move for the same time. Find the ratio of their kinetic energies.

Discussion

19.	A cord is wrapped around a pulley that is shaped like a disk of mass m and radius r. The cord's free end is connected to a block of mass M. The block starts from rest and then slides down an incline that makes an angle θ with the horizontal as shown in figure. The coefficient of kinetic friction between block and incline is μ. Then, the block's speed as a function of position d down the incline is
Answer» A cord is wrapped around a pulley that is shaped like a disk of mass $m$ and radius $r$ . The cord's free end is connected to a block of mass $M$ . The block starts from rest and then slides down an incline that makes an angle $θ$ with the horizontal as shown in figure. The coefficient of kinetic friction between block and incline is $μ$ . Then, the block's speed as a function of position $d$ down the incline is

Discussion

20.	The teachers of Geeta's school took the students on a study trip to a power generating station, located nearly 200 km away from the city. The teacher explained that electrical energy is transmitted over such a long distance to their city, in the form of, alternating current (ac) raised to a high voltage. At the receiving end in the city, the voltage is reduced to operate the devices. As a result, the power loss is reduced. Geeta listened to the teacher and asked questions about how the ac is converted to a higher or lower voltage. (a) Name the device used to change the alternating voltage to a higher or lower value. State one cause for power dissipation in this device. (b) Explain with an example, how power loss is reduced if the energy is transmitted over long distances as an alternating current rather than a direct current. (c) Write two values each shown by the teachers and Geeta.
Answer» The teachers of Geeta's school took the students on a study trip to a power generating station, located nearly 200 km away from the city. The teacher explained that electrical energy is transmitted over such a long distance to their city, in the form of, alternating current (ac) raised to a high voltage. At the receiving end in the city, the voltage is reduced to operate the devices. As a result, the power loss is reduced. Geeta listened to the teacher and asked questions about how the ac is converted to a higher or lower voltage. (a) Name the device used to change the alternating voltage to a higher or lower value. State one cause for power dissipation in this device. (b) Explain with an example, how power loss is reduced if the energy is transmitted over long distances as an alternating current rather than a direct current. (c) Write two values each shown by the teachers and Geeta.

Discussion

21.	Figure shows the variation of force acting on a body with time. Assuming the body to start from rest the variation of its momentum with time is best represented by which plot?
Answer» Figure shows the variation of force acting on a body with time. Assuming the body to start from rest the variation of its momentum with time is best represented by which plot?

Discussion

22.	Moment of inertia of a uniform solid cylinder of radius 1 m about its central axis is 1 kg-m2. The moment of inertia of a uniform solid cylinder of the same mass, but of radius 2 m about its central axis is (in kg-m2) (in kg.m−2)
Answer» Moment of inertia of a uniform solid cylinder of radius $1 m$ about its central axis is $1 {kg-m}^{2}$ . The moment of inertia of a uniform solid cylinder of the same mass, but of radius $2 m$ about its central axis is (in ${kg-m}^{2}$ ) (in ${kg.m}^{- 2}$ )

Discussion

23.	If the resistance of a conductor is 5 Ω at 50∘C and 7 Ω at 100∘C, then the mean temperature coefficient of resistance is
Answer» If the resistance of a conductor is $5 Ω$ at $50^{\circ} C$ and $7 Ω$ at $100^{\circ} C$ , then the mean temperature coefficient of resistance is

Discussion

24.	A wave moving in a gas
Answer» A wave moving in a gas

Discussion

25.	The electric field in a region is given by →E=(Ax3)^i Write suitable SI unit for A.Write an expression for the potential in the region assuming the potential at infinity to be zero. (Vm2,A2x2)
Answer» The electric field in a region is given by $\to E = (\frac{A}{x^{3}})^i$ Write suitable SI unit for A.Write an expression for the potential in the region assuming the potential at infinity to be zero. $(V m^{2}, \frac{A}{2 x^{2}})$

Discussion

26.	In a photoelectric experiment anode potential is plotted against plate current (IIT-JEE-2004)
Answer» In a photoelectric experiment anode potential is plotted against plate current (IIT-JEE-2004)

26.

In a photoelectric experiment anode potential is plotted against plate current (IIT-JEE-2004)

Answer»

In a photoelectric experiment anode potential is plotted against plate current

(IIT-JEE-2004)

Discussion

27.	A particle of mass M, starting from rest, undergoes uniform acceleration. If the speed acquired in time T is V, the average power delivered to the particle is
Answer» A particle of mass $M$ , starting from rest, undergoes uniform acceleration. If the speed acquired in time $T$ is $V$ , the average power delivered to the particle is

Discussion

28.	Find the current through 4 Ω resistor in the circuit shown.
Answer» Find the current through 4 $Ω$ resistor in the circuit shown.

Discussion

29.	The period of oscillation of a simple pendulum of length L suspended from the roof of a vehicle which moves without friction down an inclined plane of inclination a, is given by
Answer» The period of oscillation of a simple pendulum of length L suspended from the roof of a vehicle which moves without friction down an inclined plane of inclination a, is given by

Discussion

30.	lf all the particles of a system lie in a cube, is it necessary that the centre of mass be in the cube?
Answer» lf all the particles of a system lie in a cube, is it necessary that the centre of mass be in the cube?

Discussion

31.	A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index =μ , is introduced in the path of the beam. The convergence point is shifted by
Answer» A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index = $μ$ , is introduced in the path of the beam. The convergence point is shifted by

Discussion

32.	What type of signal does each logic gate produce? (Digital signal/analog signal)
Answer» What type of signal does each logic gate produce? (Digital signal/analog signal)

Discussion

33.	Two forces are in the ratio of 3:5 give a resultant of 35N. If the angle of inclination be 60°, calculate the magnitude of each force.
Answer» Two forces are in the ratio of 3:5 give a resultant of 35N. If the angle of inclination be 60°, calculate the magnitude of each force.

Discussion

34.	In the shown diagram m1 = m2 = 4 kg and m3 = 2 kg.Coefficient of friction between m1 and m2 is 0.5. The mass m1 is given a velocity v and it just stops at the other end of the mass m2 in 2 sec. Let a1, a2 and a3 be the acceleration m1, m2 and m3 respectively, then:
Answer» In the shown diagram m $_{1}$ = m $_{2}$ = 4 kg and m $_{3}$ = 2 kg.Coefficient of friction between m $_{1}$ and m $_{2}$ is 0.5. The mass m $_{1}$ is given a velocity v and it just stops at the other end of the mass m $_{2}$ in 2 sec. Let a $_{1}$ , a $_{2}$ and a $_{3}$ be the acceleration m $_{1}$ , m $_{2}$ and m $_{3}$ respectively, then:

34.

In the shown diagram m1 = m2 = 4 kg and m3 = 2 kg.Coefficient of friction between m1 and m2 is 0.5. The mass m1 is given a velocity v and it just stops at the other end of the mass m2 in 2 sec. Let a1, a2 and a3 be the acceleration m1, m2 and m3 respectively, then:

Answer»

In the shown diagram m $_{1}$ = m $_{2}$ = 4 kg and m $_{3}$ = 2 kg.Coefficient of friction between m $_{1}$ and m $_{2}$ is 0.5. The mass m $_{1}$ is given a velocity v and it just stops at the other end of the mass m $_{2}$ in 2 sec. Let a $_{1}$ , a $_{2}$ and a $_{3}$ be the acceleration m $_{1}$ , m $_{2}$ and m $_{3}$ respectively, then:

Discussion

35.	A ring and a disc of same mass and radius roll without slipping along a horizontal surface with the same velocity. If the K.E. of the ring is 8 J, then K.E. of the disc is
Answer» A ring and a disc of same mass and radius roll without slipping along a horizontal surface with the same velocity. If the $K . E .$ of the ring is $8 J$ , then $K . E .$ of the disc is

Discussion

36.	A body cools from 60∘C to 50∘C in 10 minutes. If the room temperature is 25∘C and assuming that Newton's law of cooling holds good, the temperature of the body at the end of the next 10 minutes will be:
Answer» A body cools from $60^{\circ} C$ to $50^{\circ} C$ in $10$ minutes. If the room temperature is $25^{\circ} C$ and assuming that Newton's law of cooling holds good, the temperature of the body at the end of the next $10$ minutes will be:

Discussion

37.	At what angles for the first order diffraction, spacing between two planes respectively are λ and λ2 ?
Answer» At what angles for the first order diffraction, spacing between two planes respectively are $λ$ and $\frac{λ}{2}$ ?

Discussion

38.	The potential difference between the terminals of a battery of emf 6.0 V and internal resistance 1 Ω drops to 5.8 V when connected across an external resistor. Find the resistance of the external resistor.
Answer» The potential difference between the terminals of a battery of emf 6.0 V and internal resistance 1 $Ω$ drops to 5.8 V when connected across an external resistor. Find the resistance of the external resistor.

Discussion

39.	A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of energy stored in the capacitor and work done by the battery will be?
Answer» A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of energy stored in the capacitor and work done by the battery will be?

Discussion

40.	A particle moves from a point (−2ˆi+5ˆj) to (4ˆj+3ˆk) when a force of (4ˆi+3ˆj) N is applied. How much work has been done by the force ?
Answer» A particle moves from a point $(- 2 ˆ i + 5 ˆ j)$ to $(4 ˆ j + 3 ˆ k)$ when a force of $(4 ˆ i + 3 ˆ j)$ $N$ is applied. How much work has been done by the force ?

Discussion

41.	In a gravity free room a man of mass m1 is standing at a height h above the floor. He throws a ball of mass m2 vertically downwards with a speed u. Find the distance of the man from the floor when the ball reaches the ground.
Answer» In a gravity free room a man of mass $m_{1}$ is standing at a height $h$ above the floor. He throws a ball of mass $m_{2}$ vertically downwards with a speed $u$ . Find the distance of the man from the floor when the ball reaches the ground.

Discussion

42.	Three identical rigid circular cylinders A, B and C are arranged on smooth inclined surfaces as shown in figure. The least value of θ that prevent the arrangement from collapse is?
Answer» Three identical rigid circular cylinders A, B and C are arranged on smooth inclined surfaces as shown in figure. The least value of $θ$ that prevent the arrangement from collapse is?

42.

Three identical rigid circular cylinders A, B and C are arranged on smooth inclined surfaces as shown in figure. The least value of θ that prevent the arrangement from collapse is?

Answer»

Three identical rigid circular cylinders A, B and C are arranged on smooth inclined surfaces as shown in figure. The least value of $θ$ that prevent the arrangement from collapse is?

Discussion

43.	Which of the order for ionization energy is correct
Answer» Which of the order for ionization energy is correct

Discussion

44.	The adiabatic Bulk modulus of a perfect gas at pressure P is given by
Answer» The adiabatic Bulk modulus of a perfect gas at pressure $P$ is given by

Discussion

45.	Two identical drops falling with a terminal speed 'v' coalesce to form a bigger drop. The terminal velocity of the bigger drop will be
Answer» Two identical drops falling with a terminal speed 'v' coalesce to form a bigger drop. The terminal velocity of the bigger drop will be

Discussion

46.	A ball projected at an angle 450 with velocity 20 √2 ms−1 just clears a wall which is 60 m away. Find the height of the wall.
Answer» A ball projected at an angle $45^{0}$ with velocity 20 $\sqrt{2} m s^{- 1}$ just clears a wall which is 60 m away. Find the height of the wall.

Discussion

47.	The potentiometer works on the principle that at constant temperature, the resistance of a wire is proportional to its
Answer» The potentiometer works on the principle that at constant temperature, the resistance of a wire is proportional to its

Discussion

48.	If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to a diameter 2D is
Answer» If $T$ is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter $D$ to a diameter $2 D$ is

Discussion

49.	Two vectors A=3 and B=4 are perpendicular. Resultant of both these vectors is R. The projection of the vector B on the vector R is
Answer» Two vectors $A = 3$ and $B = 4$ are perpendicular. Resultant of both these vectors is $R .$ The projection of the vector $B$ on the vector $R$ is

Discussion

50.	Volume charge density of a non conducting solid sphere of radius R=30 cm is given as ρ=ρo(1−rR). Electric field inside sphere is minimum at
Answer» Volume charge density of a non conducting solid sphere of radius $R = 30 c m$ is given as $ρ = ρ_{o} (1 - \frac{r}{R}) .$ Electric field inside sphere is minimum at

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A cell of constant E.M.F. is applied across an inductor (Resistance is negligible). If rate of change of energy is R, then graph between R &amp; t(time) is

The instantaneous angular position of a point on a rotating wheel is given by the equation θ(t)=2t3−6t2. The torque on the wheel becomes zero at

The potential energy of a 1 kg particle free to move along the x− axis is given by V=(x44−x22) J The total mechanical energy of the particle is 2 J. Then the maximum speed is

When a cell is connected in the secondary circuit of a potentiometer, the balance length is found to be 810 cm. When the cell is shunted with a 5 Ω resistor, the balance length is found to be reduced to 675 cm. The internal resistance of the cell is

A smooth ring of mass m can slide on a fixed horizontal rod. A string tied to the ring passes over a fixed pulley B and carries a block C of mass as shown below. As the ring starts sliding.

Two particles are in SHM with same angular frequency and with amplitudes of A and 2A respectively along same straight line with same mean position. They cross each other at position A/2 distance from mean position in opposite direction. The phase difference between them is (If sin−1(1/4)=14.48o)

Find the position (in cm) of the first minimum with respect to central maxima for a single slit of width 0.04 mm, on a screen 2 meters distant, when light from a He-Ne laser λ=632.8 nm shine on the slit. (Answer upto 2 decimal places)

A galvanometer having a coil of resistance 20Ω needs 20mA current for full scale deflection . In order to pass a maximum current of 2 A through the galvanometer, the resistance should be added as a shunt is(nearly)

Assertion : When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur Reason : Some energy disappears in the form of heat, sparking etc. Choose the most appropriate correct option:

The figure shows a part of a complete circuit. The potential difference VB–VA when the current I is 5A and is decreasing at a rate of 103 A s–1 is given by

An aircraft executes a horizontal loop with a speed of 150 m/s with its, wings banked at an angle of 120∘. The radius of the loop is (g=10 m/s2)

A mono-atomic ideal gas is compressed from volume V to V2 through various processes. For which of the following process final pressure will be maximum?

An object is projected at an angle of 45∘ with the horizontal. The horizontal range and the maximum height reached will be in the ratio.

A sensor is exposed for time t to a lamp of power P at distance l. The sensor has an opening that is 4d in diameter. Assuming all of the energy is given off as light, the number of photons entering the sensor if the wavelength of the light is λ is

In an AC circuit, the voltage V and the current I are given by V=100 sin(100 π t) volt and I=100 sin [100t+π3]mA , The power dissipated in the circuit is

Two particles of masses m and 2m having same charges q each are placed in a uniform electric field E and allowed to move for the same time. Find the ratio of their kinetic energies.

Figure shows the variation of force acting on a body with time. Assuming the body to start from rest the variation of its momentum with time is best represented by which plot?

Moment of inertia of a uniform solid cylinder of radius 1 m about its central axis is 1 kg-m2. The moment of inertia of a uniform solid cylinder of the same mass, but of radius 2 m about its central axis is (in kg-m2) (in kg.m−2)

If the resistance of a conductor is 5 Ω at 50∘C and 7 Ω at 100∘C, then the mean temperature coefficient of resistance is

A wave moving in a gas

The electric field in a region is given by →E=(Ax3)^i Write suitable SI unit for A.Write an expression for the potential in the region assuming the potential at infinity to be zero. (Vm2,A2x2)

In a photoelectric experiment anode potential is plotted against plate current (IIT-JEE-2004)

A particle of mass M, starting from rest, undergoes uniform acceleration. If the speed acquired in time T is V, the average power delivered to the particle is

Find the current through 4 Ω resistor in the circuit shown.

The period of oscillation of a simple pendulum of length L suspended from the roof of a vehicle which moves without friction down an inclined plane of inclination a, is given by

lf all the particles of a system lie in a cube, is it necessary that the centre of mass be in the cube?

A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index =μ , is introduced in the path of the beam. The convergence point is shifted by

What type of signal does each logic gate produce? (Digital signal/analog signal)

Two forces are in the ratio of 3:5 give a resultant of 35N. If the angle of inclination be 60°, calculate the magnitude of each force.

In the shown diagram m1 = m2 = 4 kg and m3 = 2 kg.Coefficient of friction between m1 and m2 is 0.5. The mass m1 is given a velocity v and it just stops at the other end of the mass m2 in 2 sec. Let a1, a2 and a3 be the acceleration m1, m2 and m3 respectively, then:

A ring and a disc of same mass and radius roll without slipping along a horizontal surface with the same velocity. If the K.E. of the ring is 8 J, then K.E. of the disc is

A body cools from 60∘C to 50∘C in 10 minutes. If the room temperature is 25∘C and assuming that Newton's law of cooling holds good, the temperature of the body at the end of the next 10 minutes will be:

At what angles for the first order diffraction, spacing between two planes respectively are λ and λ2 ?

The potential difference between the terminals of a battery of emf 6.0 V and internal resistance 1 Ω drops to 5.8 V when connected across an external resistor. Find the resistance of the external resistor.

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of energy stored in the capacitor and work done by the battery will be?

A particle moves from a point (−2ˆi+5ˆj) to (4ˆj+3ˆk) when a force of (4ˆi+3ˆj) N is applied. How much work has been done by the force ?

In a gravity free room a man of mass m1 is standing at a height h above the floor. He throws a ball of mass m2 vertically downwards with a speed u. Find the distance of the man from the floor when the ball reaches the ground.

Three identical rigid circular cylinders A, B and C are arranged on smooth inclined surfaces as shown in figure. The least value of θ that prevent the arrangement from collapse is?

Which of the order for ionization energy is correct

The adiabatic Bulk modulus of a perfect gas at pressure P is given by

Two identical drops falling with a terminal speed 'v' coalesce to form a bigger drop. The terminal velocity of the bigger drop will be

A ball projected at an angle 450 with velocity 20 √2 ms−1 just clears a wall which is 60 m away. Find the height of the wall.

The potentiometer works on the principle that at constant temperature, the resistance of a wire is proportional to its

If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to a diameter 2D is

Two vectors A=3 and B=4 are perpendicular. Resultant of both these vectors is R. The projection of the vector B on the vector R is

Volume charge density of a non conducting solid sphere of radius R=30 cm is given as ρ=ρo(1−rR). Electric field inside sphere is minimum at

A cell of constant E.M.F. is applied across an inductor (Resistance is negligible). If rate of change of energy is R, then graph between R & t(time) is