50278 + Interview Questions in Physics

1.	The direction of dipole moment is
Answer» The direction of dipole moment is

Discussion

2.	If n drops, each of capacitance C, coalesce to form a single big drop, the capacitance of the big drop will be
Answer» If n drops, each of capacitance C, coalesce to form a single big drop, the capacitance of the big drop will be

Discussion

3.	Dry cell of emf 2 V and internal resistance 0.10 ohm is connected to resistance of R ohm. The current drawn from the cell is 2.0 A. The voltage drop across R is
Answer» Dry cell of emf 2 V and internal resistance 0.10 ohm is connected to resistance of R ohm. The current drawn from the cell is 2.0 A. The voltage drop across R is

Discussion

4.	The point B lies on a smooth plane inclined at 30∘ to the horizontal. A particle of mass 17 kg is dropped from a point A which lies 10 m vertically above B. The particle rebounds from the plane in the direction BC with speed v m/s at an angle of 45∘ to the plane. Find the impulse exerted by the plane on the particle (in Ns)
Answer» The point B lies on a smooth plane inclined at $30^{\circ}$ to the horizontal. A particle of mass $\frac{1}{7} kg$ is dropped from a point A which lies $10 m$ vertically above B. The particle rebounds from the plane in the direction BC with speed $v m/s$ at an angle of $45^{\circ}$ to the plane. Find the impulse exerted by the plane on the particle (in $Ns$ )

Discussion

5.	Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns Column A Column B Pitch Waveform Quality Frequency Loudness Intensity
Answer» Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns Column A Column B Pitch Waveform Quality Frequency Loudness Intensity

5.

Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns Column A Column B Pitch Waveform Quality Frequency Loudness Intensity

Answer»

Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns

Column A Column B

Pitch Waveform

Quality Frequency

Loudness Intensity

Discussion

6.	Two particles of the same mass are projected from the ground with the same speed 10 m/s at an angle 37∘ and 53∘ with the horizontal respectively. Find out the maximum height attained by their COM. (g=9.8 m/s2)
Answer» Two particles of the same mass are projected from the ground with the same speed $10 m/s$ at an angle $37^{\circ}$ and $53^{\circ}$ with the horizontal respectively. Find out the maximum height attained by their $C O M$ . $(g = 9.8 {m/s}^{2})$

Discussion

7.	A gas bulb is filled with NO2 gas and immersed in an ice bath at 0∘ C which becomes colourless after sometimes. This colourless gas will be
Answer» A gas bulb is filled with $N O_{2}$ gas and immersed in an ice bath at $0^{\circ} C$ which becomes colourless after sometimes. This colourless gas will be

Discussion

8.	The potential energy of a particle that is free to move along (x−axis) is given by U=(x3−x22)J, where x is in 'm'. The particle is initially at x=0. Find the magnitude of force at x=2 m.
Answer» The potential energy of a particle that is free to move along $(x -$ axis $)$ is given by $U = (x^{3} - \frac{x^{2}}{2}) J$ , where $x$ is in $'m'$ . The particle is initially at $x = 0$ . Find the magnitude of force at $x = 2 m$ .

Discussion

9.	A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 seconds and [MP PMT 1990]
Answer» A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 seconds and [MP PMT 1990]

9.

A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 seconds and [MP PMT 1990]

Answer»

A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 seconds and

[MP PMT 1990]

Discussion

10.	A train S1 moving with a uniform velocity of 108 km/h approaches another train S2 standing on a platform. An observer O moves with a uniform velocity of 36 km/h towards S2 as shown in figure. Both the trains are blowing whistles of same frequency 120 Hz. When O is 600 m away from S2 and distance between S1 and S2 is 800 m, the number of beats heard by O is . (Speed of the sound =330 m/s)
Answer» A train $S_{1}$ moving with a uniform velocity of $108 k m / h$ approaches another train $S_{2}$ standing on a platform. An observer $O$ moves with a uniform velocity of $36 k m / h$ towards $S_{2}$ as shown in figure. Both the trains are blowing whistles of same frequency $120 H z$ . When O is $600 m$ away from $S_{2}$ and distance between $S_{1}$ and $S_{2}$ is $800 m$ , the number of beats heard by O is . (Speed of the sound $= 330 m / s$ )

Discussion

11.	Find the charge in μC supplied by the battery in the arrangement shown in figure.
Answer» Find the charge in $μ C$ supplied by the battery in the arrangement shown in figure.

Discussion

12.	In the given circuit heat generated in resistance in time interval △t=10−6sec just after closing switch in milli joules is
Answer» In the given circuit heat generated in resistance in time interval $△ t = 10^{- 6} s e c$ just after closing switch in milli joules is

Discussion

13.	Which one of the following graphs represents correctly the variation of the gravitational field (I) with the distance (r) from the centre of a spherical shell of mass M and radius a
Answer» Which one of the following graphs represents correctly the variation of the gravitational field (I) with the distance (r) from the centre of a spherical shell of mass M and radius a

Discussion

14.	A heavy particles is suspended by a string of length l from a fixed point O. The particle is given a horizontal velocity v0 the string slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.
Answer» A heavy particles is suspended by a string of length l from a fixed point O. The particle is given a horizontal velocity $v_{0}$ the string slack at some angle and the particle proceeds on a parabola. Find the value of $v_{0}$ if the particle passes through the point of suspension.

Discussion

15.	If the pressure due to liquid varies with the depth y as shown in figure, then the density of the liquid is (g=10 m/s2)
Answer» If the pressure due to liquid varies with the depth $y$ as shown in figure, then the density of the liquid is $(g = 10 m / s^{2})$

Discussion

16.	If two bodies were rubbed against each other and one aquired a -5mC charge, what will be the charge on the other body?
Answer» If two bodies were rubbed against each other and one aquired a -5mC charge, what will be the charge on the other body?

Discussion

17.	The amount of heat needed to increase the temperature of 1 gm of water from 14.5∘C to 15.5∘C at one atmosphere is
Answer» The amount of heat needed to increase the temperature of $1 gm$ of water from ${14.5}^{\circ} C$ to ${15.5}^{\circ} C$ at one atmosphere is

Discussion

18.	An inductor of inductance 2.00 H is joined in series with a resistor of resistance 200Ω and a battery of emf 2.00 V. At t = 10 ms, find (a) The curent in the circuit, (b) the power delivered by the battery, (c) the power dissipated in heating the resistor and (d) the rate at which energy is being stored in magnetic field.
Answer» An inductor of inductance 2.00 H is joined in series with a resistor of resistance $200 Ω$ and a battery of emf 2.00 V. At t = 10 ms, find (a) The curent in the circuit, (b) the power delivered by the battery, (c) the power dissipated in heating the resistor and (d) the rate at which energy is being stored in magnetic field.

Discussion

19.	A block of 10 kg is pulled in a vertical plane along a frictionless surface in the form of an arc of a circle of radius 10 m. A force of 200 N is applied such that tension in the string always remains along the tangential direction as shown in figure. If the block started from rest at A, the velocity at B would be: Consider π3=1 for calculation and take g=10 m/s2)
Answer» A block of $10 kg$ is pulled in a vertical plane along a frictionless surface in the form of an arc of a circle of radius $10 m$ . A force of $200 N$ is applied such that tension in the string always remains along the tangential direction as shown in figure. If the block started from rest at $A$ , the velocity at $B$ would be: Consider $\frac{π}{3} = 1$ for calculation and take $g = 10 {m/s}^{2}$ )

Discussion

20.	Three identical cahrges, each having a value 1.0×10−8C, are placed at the corners of an equilateral triangle of side 20 cm. Find th eelectric field and potential at the centre of the triangle
Answer» Three identical cahrges, each having a value $1.0 \times 10^{- 8} C,$ are placed at the corners of an equilateral triangle of side 20 cm. Find th eelectric field and potential at the centre of the triangle

Discussion

21.	Why can't we take components of normal while solving problems based on Newton's laws of motion?
Answer» Why can't we take components of normal while solving problems based on Newton's laws of motion?

Discussion

22.	A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity v0. The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.
Answer» A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity $v_{0}$ . The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of $v_{0}$ if the particle passes through the point of suspension.

22.

A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity v0. The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.

Answer»

A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity $v_{0}$ . The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of $v_{0}$ if the particle passes through the point of suspension.

Discussion

23.	Charge Q is placed inside cone as shown in figure such that θ=60∘. Flux of electric field associated with curved surface of cone is.
Answer» Charge Q is placed inside cone as shown in figure such that $θ = 60^{\circ}$ . Flux of electric field associated with curved surface of cone is.

Discussion

24.	Three capacitors of capacitances 3 μF are available. The minimum and maximum capacitances, which may be obtained, are
Answer» Three capacitors of capacitances 3 μF are available. The minimum and maximum capacitances, which may be obtained, are

Discussion

25.	A boat is sent across the river with a velocity of 8 km/h in a direction perpendicular to flow of river. If resultant velocity of boat is 10 km/h, then velocity of river flow is
Answer» A boat is sent across the river with a velocity of $8 km/h$ in a direction perpendicular to flow of river. If resultant velocity of boat is $10 km/h$ , then velocity of river flow is

Discussion

26.	An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to Q0 and then connected to the L and R as shown below: If a student plots graphs of the square of maximum charge on the capacitor with time (t) for two different values L1 and L2 (L1>L2) of L then which of the following represents this graph correctly? (plots are schematic and not drawn to scale)
Answer» An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to Q₀ and then connected to the L and R as shown below: If a student plots graphs of the square of maximum charge on the capacitor with time (t) for two different values L₁ and L₂ (L₁>L₂) of L then which of the following represents this graph correctly? (plots are schematic and not drawn to scale)

26.

An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to Q0 and then connected to the L and R as shown below: If a student plots graphs of the square of maximum charge on the capacitor with time (t) for two different values L1 and L2 (L1>L2) of L then which of the following represents this graph correctly? (plots are schematic and not drawn to scale)

Answer»

An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to Q₀ and then connected to the L and R as shown below:

If a student plots graphs of the square of maximum charge on the capacitor with time (t) for two different values L₁ and L₂ (L₁>L₂) of L then which of the following represents this graph correctly? (plots are schematic and not drawn to scale)

Discussion

27.	Simultaneous determination of exact position and momentum of an electron is:
Answer» Simultaneous determination of exact position and momentum of an electron is:

Discussion

28.	Heat energy absorbed by a system in going through a cyclic process shown in figure is
Answer» Heat energy absorbed by a system in going through a cyclic process shown in figure is

Discussion

29.	Four charges, each equal to -Q, are placed at the corners of a square and a charge +q placed at its centre. If the system is in equilibrium, the value of q is
Answer» Four charges, each equal to -Q, are placed at the corners of a square and a charge +q placed at its centre. If the system is in equilibrium, the value of q is

Discussion

30.	A body of mass 1 kg is travelling with constant velocity of 3 m/s due East. It then turns North to travel with a constant velocity of 4 m/s. Find the impulse acting on the body due to change in its direction in vector form. (Take east and north as positive x-axis and y-axis respectively)
Answer» A body of mass $1 k g$ is travelling with constant velocity of $3 m / s$ due East. It then turns North to travel with a constant velocity of $4 m / s$ . Find the impulse acting on the body due to change in its direction in vector form. (Take east and north as positive x-axis and y-axis respectively)

Discussion

31.	Four cubes of ice at −10∘C, each of one gram, is taken out from a refrigerator and dropped into 150 g of water at 20∘C. Find the temperature of the water when thermal equilibrium is attained. Assume that no heat is lost to the outside and the water equivalent of the container is 46 g. (Specific heat capacity of water =1 cal/g∘C, specific heat capacity of ice =0.5 cal/g∘C, latent heat of fusion of ice =80 cal/g)
Answer» Four cubes of ice at $- 10^{\circ} C$ , each of one gram, is taken out from a refrigerator and dropped into $150 g$ of water at $20^{\circ} C$ . Find the temperature of the water when thermal equilibrium is attained. Assume that no heat is lost to the outside and the water equivalent of the container is $46 g$ . (Specific heat capacity of water $= 1 cal/g^{\circ} C$ , specific heat capacity of ice $= 0.5 cal/g^{\circ} C$ , latent heat of fusion of ice $= 80 cal/g$ )

Discussion

32.	A man measures the period of a simple pendulum inside a stationary lift and finds it to be T sec. If the lift accelerates upwards with an acceleration g/4, then the period of the pendulum will be
Answer» A man measures the period of a simple pendulum inside a stationary lift and finds it to be T sec. If the lift accelerates upwards with an acceleration g/4, then the period of the pendulum will be

32.

A man measures the period of a simple pendulum inside a stationary lift and finds it to be T sec. If the lift accelerates upwards with an acceleration g/4, then the period of the pendulum will be

Answer»

A man measures the period of a simple pendulum inside a stationary lift and finds it to be T sec. If the lift accelerates upwards with an acceleration g/4, then the period of the pendulum will be

Discussion

33.	If the Young's modulus of the material is 3 times its modulus of rigidity, then its volume elasticity will be
Answer» If the Young's modulus of the material is 3 times its modulus of rigidity, then its volume elasticity will be

Discussion

34.	A disc is rolling without slipping with angular velocity 'ω'. 'P' and 'Q' are two points equidistant from the centre 'C'. The order of magnitude of velocity is
Answer» A disc is rolling without slipping with angular velocity ' $ω$ '. 'P' and 'Q' are two points equidistant from the centre 'C'. The order of magnitude of velocity is

34.

A disc is rolling without slipping with angular velocity 'ω'. 'P' and 'Q' are two points equidistant from the centre 'C'. The order of magnitude of velocity is

Answer»

A disc is rolling without slipping with angular velocity ' $ω$ '. 'P' and 'Q' are two points equidistant from the centre 'C'. The order of magnitude of velocity is

Discussion

35.	A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of the heaviest fragment will be
Answer» A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of the heaviest fragment will be

35.

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of the heaviest fragment will be

Answer»

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of the heaviest fragment will be

Discussion

36.	A particle has displacement of 12 m towards east and 5 m towards north then 6 m vertically upward. The sum of these displacements is
Answer» A particle has displacement of 12 m towards east and 5 m towards north then 6 m vertically upward. The sum of these displacements is

Discussion

37.	The average kinetic energy of an ideal gas per molecule in SI unit at 25∘C will be:
Answer» The average kinetic energy of an ideal gas per molecule in SI unit at $25^{\circ} C$ will be:

Discussion

38.	A particle moved rectilinearly. It's displacement X at time to is given by x^2=at^2+b where a and b are constants. It's acceleration at time to is proportional to I HAVE NOT TAKEN MATH SO PLS EXPLAIN ACCORDINGLY
Answer» A particle moved rectilinearly. It's displacement X at time to is given by x^2=at^2+b where a and b are constants. It's acceleration at time to is proportional to I HAVE NOT TAKEN MATH SO PLS EXPLAIN ACCORDINGLY

38.

A particle moved rectilinearly. It's displacement X at time to is given by x^2=at^2+b where a and b are constants. It's acceleration at time to is proportional to I HAVE NOT TAKEN MATH SO PLS EXPLAIN ACCORDINGLY

Answer»

A particle moved rectilinearly. It's displacement X at time to is given by x^2=at^2+b where a and b are constants. It's acceleration at time to is proportional to

I HAVE NOT TAKEN MATH SO PLS EXPLAIN ACCORDINGLY

Discussion

39.	A car is moving in a circular path of radius 2 m. Calculate both the distance and the magnitude of the displacement of the car after i) one complete revolution ii) one-half revolution iii) one-fourth revolution. What can you conclude about the relationship between distance and displacement.
Answer» A car is moving in a circular path of radius 2 m. Calculate both the distance and the magnitude of the displacement of the car after i) one complete revolution ii) one-half revolution iii) one-fourth revolution. What can you conclude about the relationship between distance and displacement.

Discussion

40.	Light effect can be occur by electric field?how?
Answer» Light effect can be occur by electric field?how?

Discussion

41.	When a block of mass 2 kg is suspended by a long wire of length 1 m, the length of wire becomes 1.02 m. The elastic potential energy stored in wire is (Take g=10 m/s2)
Answer» When a block of mass $2 kg$ is suspended by a long wire of length $1 m$ , the length of wire becomes $1.02 m$ . The elastic potential energy stored in wire is (Take $g = 10 m / s^{2}$ )

Discussion

42.	A cylindrical wooden block of area of cross section A, height H and density ρ is floating in water of density ρw. If block is slightly pushed down into water and released, it starts performing simple hormonic motion (SHM). Time period of SHM of the block is independent of
Answer» A cylindrical wooden block of area of cross section $A$ , height $H$ and density $ρ$ is floating in water of density $ρ_{w}$ . If block is slightly pushed down into water and released, it starts performing simple hormonic motion (SHM). Time period of SHM of the block is independent of

Discussion

43.	If the speed of a transverse wave on a stretched string of length 1 m is 60 ms−1, what is the fundamental. frequency of vibration ?
Answer» If the speed of a transverse wave on a stretched string of length 1 m is $60 m s^{- 1}$ , what is the fundamental. frequency of vibration ?

Discussion

44.	A staircase contains three steps each 10 cm high and 20 cm wide figure. What should be the minimum horizontal velocity of a ball rilling off the uppermost plane so as to hit directly the lowest plane?
Answer» A staircase contains three steps each 10 cm high and 20 cm wide figure. What should be the minimum horizontal velocity of a ball rilling off the uppermost plane so as to hit directly the lowest plane?

44.

A staircase contains three steps each 10 cm high and 20 cm wide figure. What should be the minimum horizontal velocity of a ball rilling off the uppermost plane so as to hit directly the lowest plane?

Answer»

A staircase contains three steps each 10 cm high and 20 cm wide figure. What should be the minimum horizontal velocity of a ball rilling off the uppermost plane so as to hit directly the lowest plane?

Discussion

45.	Two boys are standing at the ends A and B of a ground where AB = a . The boy at B starts running in a direction perpendicular to AB with velocity v1). The boy at A starts running simultaneously with velocity v and catches the other boy in a time t, where t is
Answer» Two boys are standing at the ends A and B of a ground where AB = a . The boy at B starts running in a direction perpendicular to AB with velocity $v_{1})$ _. The boy at A starts running simultaneously with velocity v and catches the other boy in a time t, where t is

Discussion

46.	The velocity of a projectile at the initial point A is (2^i+3^j)m/s. Its velocity at point B is
Answer» The velocity of a projectile at the initial point A is $(2^i + 3^j) m / s$ . Its velocity at point B is

Discussion

47.	The ratio of the energy of 2000˙A a photon of wavelength radiation to that 4000˙A of radiation is
Answer» The ratio of the energy of $2000 ˙ A$ a photon of wavelength radiation to that $4000 ˙ A$ of radiation is

47.

The ratio of the energy of 2000˙A a photon of wavelength radiation to that 4000˙A of radiation is

Answer»

The ratio of the energy of $2000 ˙ A$ a photon of wavelength radiation to that $4000 ˙ A$ of radiation is

Discussion

48.	Assertion & Reason type Statement1: Electric field is always perpendicular to an equipotential surface. Statement2: If there was a component of →E along the surface, that would mean there is a potential change along that component and hence the surface is not equipotential.
Answer» Assertion & Reason type Statement1: Electric field is always perpendicular to an equipotential surface. Statement2: If there was a component of $\to E$ along the surface, that would mean there is a potential change along that component and hence the surface is not equipotential.

Discussion

49.	A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between the body and that of the surroundings is T, then
Answer» A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between the body and that of the surroundings is T, then

Discussion

50.	The insulated metal spheres of radii R1 and R2 having charges Q1 and Q2 respectively are connected to each other. There is
Answer» The insulated metal spheres of radii R₁ and R₂ having charges Q₁ and Q₂ respectively are connected to each other. There is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The direction of dipole moment is

If n drops, each of capacitance C, coalesce to form a single big drop, the capacitance of the big drop will be

Dry cell of emf 2 V and internal resistance 0.10 ohm is connected to resistance of R ohm. The current drawn from the cell is 2.0 A. The voltage drop across R is

Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns Column A Column B Pitch Waveform Quality Frequency Loudness Intensity

Two particles of the same mass are projected from the ground with the same speed 10 m/s at an angle 37∘ and 53∘ with the horizontal respectively. Find out the maximum height attained by their COM. (g=9.8 m/s2)

A gas bulb is filled with NO2 gas and immersed in an ice bath at 0∘ C which becomes colourless after sometimes. This colourless gas will be

The potential energy of a particle that is free to move along (x−axis) is given by U=(x3−x22)J, where x is in 'm'. The particle is initially at x=0. Find the magnitude of force at x=2 m.

A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 seconds and [MP PMT 1990]

Find the charge in μC supplied by the battery in the arrangement shown in figure.

In the given circuit heat generated in resistance in time interval △t=10−6sec just after closing switch in milli joules is

Which one of the following graphs represents correctly the variation of the gravitational field (I) with the distance (r) from the centre of a spherical shell of mass M and radius a

A heavy particles is suspended by a string of length l from a fixed point O. The particle is given a horizontal velocity v0 the string slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.

If the pressure due to liquid varies with the depth y as shown in figure, then the density of the liquid is (g=10 m/s2)

If two bodies were rubbed against each other and one aquired a -5mC charge, what will be the charge on the other body?

The amount of heat needed to increase the temperature of 1 gm of water from 14.5∘C to 15.5∘C at one atmosphere is

Three identical cahrges, each having a value 1.0×10−8C, are placed at the corners of an equilateral triangle of side 20 cm. Find th eelectric field and potential at the centre of the triangle

Why can't we take components of normal while solving problems based on Newton's laws of motion?

A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity v0. The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.

Charge Q is placed inside cone as shown in figure such that θ=60∘. Flux of electric field associated with curved surface of cone is.

Three capacitors of capacitances 3 μF are available. The minimum and maximum capacitances, which may be obtained, are

A boat is sent across the river with a velocity of 8 km/h in a direction perpendicular to flow of river. If resultant velocity of boat is 10 km/h, then velocity of river flow is

Simultaneous determination of exact position and momentum of an electron is:

Heat energy absorbed by a system in going through a cyclic process shown in figure is

Four charges, each equal to -Q, are placed at the corners of a square and a charge +q placed at its centre. If the system is in equilibrium, the value of q is

A body of mass 1 kg is travelling with constant velocity of 3 m/s due East. It then turns North to travel with a constant velocity of 4 m/s. Find the impulse acting on the body due to change in its direction in vector form. (Take east and north as positive x-axis and y-axis respectively)

A man measures the period of a simple pendulum inside a stationary lift and finds it to be T sec. If the lift accelerates upwards with an acceleration g/4, then the period of the pendulum will be

If the Young's modulus of the material is 3 times its modulus of rigidity, then its volume elasticity will be

A disc is rolling without slipping with angular velocity 'ω'. 'P' and 'Q' are two points equidistant from the centre 'C'. The order of magnitude of velocity is

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of the heaviest fragment will be

A particle has displacement of 12 m towards east and 5 m towards north then 6 m vertically upward. The sum of these displacements is

The average kinetic energy of an ideal gas per molecule in SI unit at 25∘C will be:

A particle moved rectilinearly. It's displacement X at time to is given by x^2=at^2+b where a and b are constants. It's acceleration at time to is proportional to I HAVE NOT TAKEN MATH SO PLS EXPLAIN ACCORDINGLY

A car is moving in a circular path of radius 2 m. Calculate both the distance and the magnitude of the displacement of the car after i) one complete revolution ii) one-half revolution iii) one-fourth revolution. What can you conclude about the relationship between distance and displacement.

Light effect can be occur by electric field?how?

When a block of mass 2 kg is suspended by a long wire of length 1 m, the length of wire becomes 1.02 m. The elastic potential energy stored in wire is (Take g=10 m/s2)

A cylindrical wooden block of area of cross section A, height H and density ρ is floating in water of density ρw. If block is slightly pushed down into water and released, it starts performing simple hormonic motion (SHM). Time period of SHM of the block is independent of

If the speed of a transverse wave on a stretched string of length 1 m is 60 ms−1, what is the fundamental. frequency of vibration ?

A staircase contains three steps each 10 cm high and 20 cm wide figure. What should be the minimum horizontal velocity of a ball rilling off the uppermost plane so as to hit directly the lowest plane?

Two boys are standing at the ends A and B of a ground where AB = a . The boy at B starts running in a direction perpendicular to AB with velocity v1). The boy at A starts running simultaneously with velocity v and catches the other boy in a time t, where t is

The velocity of a projectile at the initial point A is (2^i+3^j)m/s. Its velocity at point B is

The ratio of the energy of 2000˙A a photon of wavelength radiation to that 4000˙A of radiation is

Assertion &amp; Reason type Statement1: Electric field is always perpendicular to an equipotential surface. Statement2: If there was a component of →E along the surface, that would mean there is a potential change along that component and hence the surface is not equipotential.

A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between the body and that of the surroundings is T, then

The insulated metal spheres of radii R1 and R2 having charges Q1 and Q2 respectively are connected to each other. There is

Assertion & Reason type Statement1: Electric field is always perpendicular to an equipotential surface. Statement2: If there was a component of →E along the surface, that would mean there is a potential change along that component and hence the surface is not equipotential.