50278 + Interview Questions in Physics

1.	If the horizontal component of the magnetic field is two times that of vertical component of the earth’s magnetic field then, the angle of dip is(Given: tan27∘=0.5, tan37∘=0.75, tan47∘=1.07, tan17∘=0.3)
Answer» If the horizontal component of the magnetic field is two times that of vertical component of the earth’s magnetic field then, the angle of dip is (Given: $tan 27^{\circ} = 0.5, tan 37^{\circ} = 0.75, tan 47^{\circ} = 1.07, tan 17^{\circ} = 0.3$ )

Discussion

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

Discussion

3.	Figure shows a block A of mass 8m having a smooth semi circular groove of radius a placed on a smooth horizontal surface. A block B of mass m is released from a position in groove, where its radius is horizontal. The speed of block A when block B reaches its bottom is
Answer» Figure shows a block A of mass $8 m$ having a smooth semi circular groove of radius $a$ placed on a smooth horizontal surface. A block B of mass $m$ is released from a position in groove, where its radius is horizontal. The speed of block A when block B reaches its bottom is

Discussion

4.	A cell of EMF 1.8 V and internal resistance 2Ω is connected in a series with an ammeter of resistance 0.7Ω and a resistor of 4.5Ω as shown below. (a) What would be the reading of the ammeter? (b) What is the potential difference across the terminals of the cell? [4 MARKS]
Answer» A cell of EMF 1.8 V and internal resistance $2 Ω$ is connected in a series with an ammeter of resistance $0.7 Ω$ and a resistor of $4.5 Ω$ as shown below. (a) What would be the reading of the ammeter? (b) What is the potential difference across the terminals of the cell? [4 MARKS]

Discussion

5.	The position of a particle varies with time as →r=at2^i+βt^j whereα=10ms−2 andβ=5 ms−1 The torque acting on the particle at t = 1s in N m is: (mass of the particle m = 0.1 kg)
Answer» The position of a particle varies with time as $\to r = a t^{2}^i + β t^j w h e r e α = 10 m s^{- 2} a n d β = 5 m s^{- 1}$ The torque acting on the particle at t = 1s in N m is: (mass of the particle m = 0.1 kg)

Discussion

6.	Draw a circuit diagram of n-p-n transistor amplifier in CE configuration. Under what condition does the transistor act as an amplifier?
Answer» Draw a circuit diagram of n-p-n transistor amplifier in CE configuration. Under what condition does the transistor act as an amplifier?

Discussion

7.	A square of side a2 is removed from a disc having radius a. Find centre of mass of remaining portion.
Answer» A square of side $\frac{a}{2}$ is removed from a disc having radius $a$ . Find centre of mass of remaining portion.

Discussion

8.	If angles of a triangle are in A.P. and b : c=3 : 2, then C = ______________.
Answer» If angles of a triangle are in A.P. and $b : c = \sqrt{3} : \sqrt{2},$ then C = ______________.

Discussion

9.	The metallic bob of a simple pendulum has the relative density ρ. The time period of this pendulum is T. If the metallic bob is immersed in water, then the new time period is given by:
Answer» The metallic bob of a simple pendulum has the relative density $ρ$ . The time period of this pendulum is T. If the metallic bob is immersed in water, then the new time period is given by:

Discussion

10.	Two loudspeakers are emitting sound waves of wavelength λ with an initial phase difference of π2. At what minimum distance from O on line AB will one hear a maxima?
Answer» Two loudspeakers are emitting sound waves of wavelength $λ$ with an initial phase difference of $\frac{π}{2}$ . At what minimum distance from O on line AB will one hear a maxima?

Discussion

11.	Two particles A and B are moving as shown in the figure. At this moment of time, the angular speed of B with respect to A is
Answer» Two particles A and B are moving as shown in the figure. At this moment of time, the angular speed of B with respect to A is

Discussion

12.	The ratio of the densities of the bodies is 3:4 and ratio of specific heats is 4:3. Find the ratio of their thermal capacities for unit volume?
Answer» The ratio of the densities of the bodies is $3 : 4$ and ratio of specific heats is $4 : 3$ . Find the ratio of their thermal capacities for unit volume?

Discussion

13.	An object of length 2.0 cm is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. Find the size of the image if the object is at a distance of 8.0 cm from the lens.
Answer» An object of length 2.0 cm is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. Find the size of the image if the object is at a distance of 8.0 cm from the lens.

Discussion

14.	Complete the series rst_ _st_s_tt_ _rrst
Answer» Complete the series rst_ _st_s_tt_ _rrst

Discussion

15.	A train of sound waves is propagated along an organ pipe and gets reflected from an open end. If the displacement amplitude of the waves (incident and reflected) are 0.002 cm, the frequency is 1000 Hz and wavelength is 40 cm, then the displacement amplitude of vibration at a point at distance 10 cm from the open end inside the pipe, is
Answer» A train of sound waves is propagated along an organ pipe and gets reflected from an open end. If the displacement amplitude of the waves (incident and reflected) are 0.002 cm, the frequency is 1000 Hz and wavelength is 40 cm, then the displacement amplitude of vibration at a point at distance 10 cm from the open end inside the pipe, is

Discussion

16.	Match the following vectors with their correct Notation (i)Vector A(ii)Vector F(iii)Vector D(iv)Vector B(v)Vector E(A)3^i(B)−2^j(C)−2^i(D)2^i(E)2^i+2^j
Answer» Match the following vectors with their correct Notation $\begin{matrix} \begin{matrix} (i) & Vector A (i i) & Vector F (i i i) & Vector D (i v) & Vector B (v) & Vector E \end{matrix} & \begin{matrix} (A) & 3^i (B) & - 2^j (C) & - 2^i (D) & 2^i (E) & 2^i + 2^j \end{matrix} \end{matrix}$

16.

Match the following vectors with their correct Notation (i)Vector A(ii)Vector F(iii)Vector D(iv)Vector B(v)Vector E(A)3^i(B)−2^j(C)−2^i(D)2^i(E)2^i+2^j

Answer»

Match the following vectors with their correct Notation

$\begin{matrix} \begin{matrix} (i) & Vector A (i i) & Vector F (i i i) & Vector D (i v) & Vector B (v) & Vector E \end{matrix} & \begin{matrix} (A) & 3^i (B) & - 2^j (C) & - 2^i (D) & 2^i (E) & 2^i + 2^j \end{matrix} \end{matrix}$

Discussion

17.	Under what condition angular frequency Ã â€°' of the damped oscillator would be equivalent to angular velocity Ã â€° of the undamped oscillator.
Answer» Under what condition angular frequency Ã â€°' of the damped oscillator would be equivalent to angular velocity Ã â€° of the undamped oscillator.

Discussion

18.	40. A rod of weight W is supported by two parallel knife edges A and B is in equilibrium in a horizontal position.The knives are at a distance d from each other.The centre of mass of the rod is at distance x from A.The normal reaction pn A is 1)W(d-x)/d 2)Wx/d 3)Wd/x 4)W(d-x)/x
Answer» 40. A rod of weight W is supported by two parallel knife edges A and B is in equilibrium in a horizontal position.The knives are at a distance d from each other.The centre of mass of the rod is at distance x from A.The normal reaction pn A is 1)W(d-x)/d 2)Wx/d 3)Wd/x 4)W(d-x)/x

Discussion

19.	In the figure shown, if a ball of mass m is at rest relative to the wedge moving to the left with an acceleration a=g√3, find the force exerted by the vertical face of the wedge on mass m.
Answer» In the figure shown, if a ball of mass $m$ is at rest relative to the wedge moving to the left with an acceleration $a = g \sqrt{3}$ , find the force exerted by the vertical face of the wedge on mass $m$ .

Discussion

20.	a 30000kg air plane takes off at a speed of 50m/s and 5min .later it is at an elevation of 3km with a speed of 100m/s.what average power is required during this 5min.if 40percent of the power is used in overcoming dissipative forces
Answer» a 30000kg air plane takes off at a speed of 50m/s and 5min .later it is at an elevation of 3km with a speed of 100m/s.what average power is required during this 5min.if 40percent of the power is used in overcoming dissipative forces

Discussion

21.	A particle is projected vertically upwards from ground with an initial speed of 57 m/s. If acceleration due to gravity is taken to be equal to 10 m/s2, then the displacement ofthe particle in the sixth second of its motion will be
Answer» A particle is projected vertically upwards from ground with an initial speed of 57 m/s. If acceleration due to gravity is taken to be equal to 10 m/s2, then the displacement of the particle in the sixth second of its motion will be

Discussion

22.	Two parallel vertical metallic rails AB and CD are separated by 1 m. They are connected at the two ends by resistances R1 and R2 as shown in figure. A horizontal metallic bar PQ of mass 0.2 kg slides without friction with maintaining contacts with the rails, vertically downward under the action of gravity. There is a uniform horizontal magnetic field of 0.6 T perpendicular to the plane of the rails in the region. It is observed when the terminal velocity is attained, the powers dissipated in R1 and R2 are 0.76 W and 1.2 W respectively.The terminal velocity of the bar is nm/s. The value of n is (Take g=9.8m/s2)
Answer» Two parallel vertical metallic rails $A B$ and $C D$ are separated by $1 m .$ They are connected at the two ends by resistances $R_{1}$ and $R_{2}$ as shown in figure. A horizontal metallic bar $P Q$ of mass $0.2 kg$ slides without friction with maintaining contacts with the rails, vertically downward under the action of gravity. There is a uniform horizontal magnetic field of $0.6 T$ perpendicular to the plane of the rails in the region. It is observed when the terminal velocity is attained, the powers dissipated in $R_{1}$ and $R_{2}$ are $0.76 W$ and $1.2 W$ respectively. The terminal velocity of the bar is $n m/s$ . The value of $n$ is (Take $g = 9.8 {m/s}^{2})$

Discussion

23.	Where do we use third equation of motion?
Answer» Where do we use third equation of motion?

Discussion

24.	A bar magnet of magnetic moment 2 Am2 is free to rotate about a vertical axis passing through its centre. The magnet is then released from rest at east -west position. Find the Kinetic energy of the magnet as it takes north-south position is ________μJ (BH=25μT) (Give integer value)
Answer» A bar magnet of magnetic moment $2 {Am}^{2}$ is free to rotate about a vertical axis passing through its centre. The magnet is then released from rest at east -west position. Find the Kinetic energy of the magnet as it takes north-south position is ________ $μ J$ $(B_{H} = 25 μ T)$ (Give integer value)

Discussion

25.	Arod of length 1.05 m having negligible mass is supported at its endsby two wires of steel (wire A)and aluminium (wire B)of equal lengths as shown in Fig. 9.15. The cross-sectional areas ofwires Aand Bare 1.0 mm2and 2.0 mm2,respectively. At what point along the rod should a mass mbe suspended in order to produce (a)equal stresses and (b) equal strains in both steel and aluminiumwires.
Answer» A rod of length 1.05 m having negligible mass is supported at its ends by two wires of steel (wire A) and aluminium (wire B) of equal lengths as shown in Fig. 9.15. The cross-sectional areas of wires A and B are 1.0 mm² and 2.0 mm², respectively. At what point along the rod should a mass m be suspended in order to produce (a) equal stresses and (b) equal strains in both steel and aluminium wires.

25.

Arod of length 1.05 m having negligible mass is supported at its endsby two wires of steel (wire A)and aluminium (wire B)of equal lengths as shown in Fig. 9.15. The cross-sectional areas ofwires Aand Bare 1.0 mm2and 2.0 mm2,respectively. At what point along the rod should a mass mbe suspended in order to produce (a)equal stresses and (b) equal strains in both steel and aluminiumwires.

Answer»

A
rod of length 1.05 m having negligible mass is supported at its ends
by two wires of steel (wire A)
and aluminium (wire B)
of equal lengths as shown in Fig. 9.15. The cross-sectional areas of
wires A
and B
are 1.0 mm²
and 2.0 mm²,
respectively. At what point along the rod should a mass m
be suspended in order to produce (a)
equal stresses and (b) equal strains in both steel and aluminium
wires.

Discussion

26.	In the given circuit the potential difference between A and B is 18V and charge on 2 micro farad capacitor is 24 micro coloumb.
Answer» In the given circuit the potential difference between A and B is 18V and charge on 2 micro farad capacitor is 24 micro coloumb.

Discussion

27.	Temperature of one mol of an ideal gas is raised by 2°C by a process. The internal energy change would be maximum if the process is 1. Isochoric 2.Adiabatic 3.isobaric 4.same for all process
Answer» Temperature of one mol of an ideal gas is raised by 2°C by a process. The internal energy change would be maximum if the process is 1. Isochoric 2.Adiabatic 3.isobaric 4.same for all process

Discussion

28.	An electrical system and its signal-flow graph representations are shown in the figure (a) and (b) respectively. The values of G2 and H1 respectively, are
Answer» An electrical system and its signal-flow graph representations are shown in the figure (a) and (b) respectively. The values of $G_{2}$ and $H_{1}$ respectively, are

Discussion

29.	In the figure shown, v is the speed of efflux, t is the time of free fall and R is the horizontal range of the liquid. Then:
Answer» In the figure shown, $v$ is the speed of efflux, $t$ is the time of free fall and $R$ is the horizontal range of the liquid. Then:

Discussion

30.	Equation of a plane progressive wave is given by y=0.5 sin 3π(t−x3). On reflection from a denser medium its amplitude becomes 25 of the amplitude of the incident wave. The equation of the reflected wave is
Answer» Equation of a plane progressive wave is given by $y = 0.5 sin 3 π (t - \frac{x}{3})$ . On reflection from a denser medium its amplitude becomes $\frac{2}{5}$ of the amplitude of the incident wave. The equation of the reflected wave is

Discussion

31.	Find the value of sin 105°, sin 15°, sin 15°+ sin 75°
Answer» Find the value of sin 105°, sin 15°, sin 15°+ sin 75°

Discussion

32.	The time taken by a body to slide down a rough 45∘ inclined plane is thrice of that is required to slide down a smooth 45∘ inclined plane. The coefficient of kinetic friction between the object and rough plane is given by:
Answer» The time taken by a body to slide down a rough $45^{\circ}$ inclined plane is thrice of that is required to slide down a smooth $45^{\circ}$ inclined plane. The coefficient of kinetic friction between the object and rough plane is given by:

Discussion

33.	The ratio of escape velocity on earth (ve) to the escape velocity on a planet (vp) whose radius and mean density are twice as that of earth is
Answer» The ratio of escape velocity on earth $(v_{e})$ to the escape velocity on a planet $(v_{p})$ whose radius and mean density are twice as that of earth is

Discussion

34.	Evaluate: i. ∫(sinx+cosx)dx ii. ∫(3x2+4)dx
Answer» Evaluate: i. $\int (sin x + cos x) d x$ ii. $\int (3 x^{2} + 4) d x$

Discussion

35.	A saucer of mass 10 g is kept floating in air with the help of bullets, each of mass halfof the saucer, fired at same velocity at the rate of 10 bullets per second. If the bullets rebound with same speed in opposite direction then elocity of bullet at the time of impact is
Answer» A saucer of mass 10 g is kept floating in air with the help of bullets, each of mass halfof the saucer, fired at same velocity at the rate of 10 bullets per second. If the bullets rebound with same speed in opposite direction then elocity of bullet at the time of impact is

Discussion

36.	The temperature of a 10 m long iron rod rises from 35 ∘C to 45 ∘C when it is left in the sun. Calculate the increase in its length as a percentage of its initial length. (αi=12×10−6/ ∘C )
Answer» The temperature of a $10 m$ long iron rod rises from $35^{\circ} C$ to $45^{\circ} C$ when it is left in the sun. Calculate the increase in its length as a percentage of its initial length. ( $α_{i} = 12 \times 10^{- 6} /^{\circ} C$ )

Discussion

37.	A body crosses the topmost point of a vertical circle at critical speed. What will be its centripetal acceleration (in m/s2) when the string becomes horizontal?
Answer» A body crosses the topmost point of a vertical circle at critical speed. What will be its centripetal acceleration (in ${m/s}^{2}$ ) when the string becomes horizontal?

Discussion

38.	Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is 10 cm
Answer» Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is $10 cm$

Discussion

39.	The energy of a system as a function of time t is given as E(t) = A2 exp(at), where a = 0.2s1. The measurement of A has an error of 1.25%. If the error in the measurement of time is 1.50%, the percentage error in the value of E(t) at t = 5 s is
Answer» The energy of a system as a function of time t is given as E(t) = A2 exp(at), where a = 0.2s1. The measurement of A has an error of 1.25%. If the error in the measurement of time is 1.50%, the percentage error in the value of E(t) at t = 5 s is

Discussion

40.	A conducting circular loop is placed in a uniform magnetic field B=40 mT with its plane perpendicular to the field, if the radius of the loop starts shrinking at a constant rate of 2 mm/s, then the induced emf in the loop at an instant when its radius is 1.0 cm is
Answer» A conducting circular loop is placed in a uniform magnetic field $B = 40 mT$ with its plane perpendicular to the field, if the radius of the loop starts shrinking at a constant rate of $2 mm/s$ , then the induced emf in the loop at an instant when its radius is $1.0 cm$ is

Discussion

41.	A body constrained to move along the z-axis of a co-ordinate system is subjected to a constant force →F=(−^i+2^j+3^k) N. What is the work done by the force in moving the body over a distance of 4 m along the z-axis?
Answer» A body constrained to move along the $z$ -axis of a co-ordinate system is subjected to a constant force $\to F = (-^i + 2^j + 3^k) N$ . What is the work done by the force in moving the body over a distance of $4 m$ along the $z$ -axis?

Discussion

42.	85.A slender homogeneous rod of length 2L floats partly immersed in water being supported by a string fastened to one of its end. The specific gravity of the rod is 0.75 . The length of rod that extends out of water is
Answer» 85.A slender homogeneous rod of length 2L floats partly immersed in water being supported by a string fastened to one of its end. The specific gravity of the rod is 0.75 . The length of rod that extends out of water is

Discussion

43.	A circular coil of radius 1m carries a current 2.5 A.If it is placed in a magnetic field of 10Wb/m the work done to rotate it from position to stable equilibrium to unstable equilibrium is=?
Answer» A circular coil of radius 1m carries a current 2.5 A.If it is placed in a magnetic field of 10Wb/m the work done to rotate it from position to stable equilibrium to unstable equilibrium is=?

Discussion

44.	For the given circuit, the power across zener diode is ____mW.
Answer» For the given circuit, the power across zener diode is ____ $mW$ .

Discussion

45.	The equation of state for real gas is given by (P+a/V2)(V-b)=RT. The dimensions of the constant "a" and "b" ??
Answer» The equation of state for real gas is given by (P+a/V2)(V-b)=RT. The dimensions of the constant "a" and "b" ??

Discussion

46.	Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10o, then the angle of prism for crown prism will be
Answer» Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10^o, then the angle of prism for crown prism will be

Discussion

47.	A hollow sphere having mass m and radius R is moving as shown in the fig. If the speed of centre of mass of sphere is V and angular speed is w=V/R. The angular momentum of the sphere about point O is m 1)5/3MVR 2)MVR 3)MVR/2 4)MVR/
Answer» A hollow sphere having mass m and radius R is moving as shown in the fig. If the speed of centre of mass of sphere is V and angular speed is w=V/R. The angular momentum of the sphere about point O is m 1)5/3MVR 2)MVR 3)MVR/2 4)MVR/

Discussion

48.	Mean free path in KTG derivation
Answer» Mean free path in KTG derivation

Discussion

49.	A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be (i) possible at high temperature (ii) possible only at low temperature (iii) not possible at any temperature (iv) possible at any temperature
Answer» A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be (i) possible at high temperature (ii) possible only at low temperature (iii) not possible at any temperature (iv) possible at any temperature

49.

A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be (i) possible at high temperature (ii) possible only at low temperature (iii) not possible at any temperature (iv) possible at any temperature

Answer»

A
reaction, A + B → C + D + q
is found to have a positive entropy change. The reaction will be

(i) possible
at high temperature

(ii) possible
only at low temperature

(iii) not
possible at any temperature

(iv) possible
at any temperature

Discussion

50.	What is the expression of loss of kinetic energy in perfectly inelastic collision?
Answer» What is the expression of loss of kinetic energy in perfectly inelastic collision?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If the horizontal component of the magnetic field is two times that of vertical component of the earth’s magnetic field then, the angle of dip is(Given: tan27∘=0.5, tan37∘=0.75, tan47∘=1.07, tan17∘=0.3)

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

Figure shows a block A of mass 8m having a smooth semi circular groove of radius a placed on a smooth horizontal surface. A block B of mass m is released from a position in groove, where its radius is horizontal. The speed of block A when block B reaches its bottom is

A cell of EMF 1.8 V and internal resistance 2Ω is connected in a series with an ammeter of resistance 0.7Ω and a resistor of 4.5Ω as shown below. (a) What would be the reading of the ammeter? (b) What is the potential difference across the terminals of the cell? [4 MARKS]

The position of a particle varies with time as →r=at2^i+βt^j whereα=10ms−2 andβ=5 ms−1 The torque acting on the particle at t = 1s in N m is: (mass of the particle m = 0.1 kg)

Draw a circuit diagram of n-p-n transistor amplifier in CE configuration. Under what condition does the transistor act as an amplifier?

A square of side a2 is removed from a disc having radius a. Find centre of mass of remaining portion.

If angles of a triangle are in A.P. and b : c=3 : 2, then C = ______________.

The metallic bob of a simple pendulum has the relative density ρ. The time period of this pendulum is T. If the metallic bob is immersed in water, then the new time period is given by:

Two loudspeakers are emitting sound waves of wavelength λ with an initial phase difference of π2. At what minimum distance from O on line AB will one hear a maxima?

Two particles A and B are moving as shown in the figure. At this moment of time, the angular speed of B with respect to A is

The ratio of the densities of the bodies is 3:4 and ratio of specific heats is 4:3. Find the ratio of their thermal capacities for unit volume?

An object of length 2.0 cm is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. Find the size of the image if the object is at a distance of 8.0 cm from the lens.

Complete the series rst_ _st_s_tt_ _rrst

Match the following vectors with their correct Notation (i)Vector A(ii)Vector F(iii)Vector D(iv)Vector B(v)Vector E(A)3^i(B)−2^j(C)−2^i(D)2^i(E)2^i+2^j

Under what condition angular frequency Ã â€°' of the damped oscillator would be equivalent to angular velocity Ã â€° of the undamped oscillator.

40. A rod of weight W is supported by two parallel knife edges A and B is in equilibrium in a horizontal position.The knives are at a distance d from each other.The centre of mass of the rod is at distance x from A.The normal reaction pn A is 1)W(d-x)/d 2)Wx/d 3)Wd/x 4)W(d-x)/x

In the figure shown, if a ball of mass m is at rest relative to the wedge moving to the left with an acceleration a=g√3, find the force exerted by the vertical face of the wedge on mass m.

a 30000kg air plane takes off at a speed of 50m/s and 5min .later it is at an elevation of 3km with a speed of 100m/s.what average power is required during this 5min.if 40percent of the power is used in overcoming dissipative forces

A particle is projected vertically upwards from ground with an initial speed of 57 m/s. If acceleration due to gravity is taken to be equal to 10 m/s2, then the displacement ofthe particle in the sixth second of its motion will be

Where do we use third equation of motion?

A bar magnet of magnetic moment 2 Am2 is free to rotate about a vertical axis passing through its centre. The magnet is then released from rest at east -west position. Find the Kinetic energy of the magnet as it takes north-south position is ________μJ (BH=25μT) (Give integer value)

In the given circuit the potential difference between A and B is 18V and charge on 2 micro farad capacitor is 24 micro coloumb.

Temperature of one mol of an ideal gas is raised by 2°C by a process. The internal energy change would be maximum if the process is 1. Isochoric 2.Adiabatic 3.isobaric 4.same for all process

An electrical system and its signal-flow graph representations are shown in the figure (a) and (b) respectively. The values of G2 and H1 respectively, are

In the figure shown, v is the speed of efflux, t is the time of free fall and R is the horizontal range of the liquid. Then:

Equation of a plane progressive wave is given by y=0.5 sin 3π(t−x3). On reflection from a denser medium its amplitude becomes 25 of the amplitude of the incident wave. The equation of the reflected wave is

Find the value of sin 105°, sin 15°, sin 15°+ sin 75°

The time taken by a body to slide down a rough 45∘ inclined plane is thrice of that is required to slide down a smooth 45∘ inclined plane. The coefficient of kinetic friction between the object and rough plane is given by:

The ratio of escape velocity on earth (ve) to the escape velocity on a planet (vp) whose radius and mean density are twice as that of earth is

Evaluate: i. ∫(sinx+cosx)dx ii. ∫(3x2+4)dx

A saucer of mass 10 g is kept floating in air with the help of bullets, each of mass halfof the saucer, fired at same velocity at the rate of 10 bullets per second. If the bullets rebound with same speed in opposite direction then elocity of bullet at the time of impact is

The temperature of a 10 m long iron rod rises from 35 ∘C to 45 ∘C when it is left in the sun. Calculate the increase in its length as a percentage of its initial length. (αi=12×10−6/ ∘C )

A body crosses the topmost point of a vertical circle at critical speed. What will be its centripetal acceleration (in m/s2) when the string becomes horizontal?

Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is 10 cm

The energy of a system as a function of time t is given as E(t) = A2 exp(at), where a = 0.2s1. The measurement of A has an error of 1.25%. If the error in the measurement of time is 1.50%, the percentage error in the value of E(t) at t = 5 s is

A conducting circular loop is placed in a uniform magnetic field B=40 mT with its plane perpendicular to the field, if the radius of the loop starts shrinking at a constant rate of 2 mm/s, then the induced emf in the loop at an instant when its radius is 1.0 cm is

A body constrained to move along the z-axis of a co-ordinate system is subjected to a constant force →F=(−^i+2^j+3^k) N. What is the work done by the force in moving the body over a distance of 4 m along the z-axis?

85.A slender homogeneous rod of length 2L floats partly immersed in water being supported by a string fastened to one of its end. The specific gravity of the rod is 0.75 . The length of rod that extends out of water is

A circular coil of radius 1m carries a current 2.5 A.If it is placed in a magnetic field of 10Wb/m the work done to rotate it from position to stable equilibrium to unstable equilibrium is=?

For the given circuit, the power across zener diode is ____mW.

The equation of state for real gas is given by (P+a/V2)(V-b)=RT. The dimensions of the constant "a" and "b" ??

Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10o, then the angle of prism for crown prism will be

A hollow sphere having mass m and radius R is moving as shown in the fig. If the speed of centre of mass of sphere is V and angular speed is w=V/R. The angular momentum of the sphere about point O is m 1)5/3MVR 2)MVR 3)MVR/2 4)MVR/

Mean free path in KTG derivation

A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be (i) possible at high temperature (ii) possible only at low temperature (iii) not possible at any temperature (iv) possible at any temperature

What is the expression of loss of kinetic energy in perfectly inelastic collision?