50278 + Interview Questions in Physics

1.	A particle travels 10 m in first 5 sec and 10 m in next 3 sec. Assuming constant acceleration what is the distance travelled in next 2 sec
Answer» A particle travels $10 m$ in first $5 sec$ and $10 m$ in next $3 sec$ . Assuming constant acceleration what is the distance travelled in next $2 sec$

Discussion

2.	In the given constraint, what will be the speed of block R (VR), if the string is inextensible and pulleys are frictionless?
Answer» In the given constraint, what will be the speed of block $R$ $(V_{R})$ , if the string is inextensible and pulleys are frictionless?

Discussion

3.	A material has Poisson's ratio 0.5. If a uniform rod made of the material suffers a longitudinal strain of 2×10−3, what is the percentage increase in volume?
Answer» A material has Poisson's ratio $0.5$ . If a uniform rod made of the material suffers a longitudinal strain of $2 \times 10^{- 3}$ , what is the percentage increase in volume?

Discussion

4.	Find the friction on B due to A when:- (i) The wall is smooth but the surfaces of A and B in contact are rough and the system is in equilibrium (ii) All the surfaces are rough (p) upward (q) downwards (r) zero (s) system cannot remain in equilibrium
Answer» Find the friction on B due to A when:- (i) The wall is smooth but the surfaces of A and B in contact are rough and the system is in equilibrium (ii) All the surfaces are rough (p) upward (q) downwards (r) zero (s) system cannot remain in equilibrium

4.

Find the friction on B due to A when:- (i) The wall is smooth but the surfaces of A and B in contact are rough and the system is in equilibrium (ii) All the surfaces are rough (p) upward (q) downwards (r) zero (s) system cannot remain in equilibrium

Answer»

Find the friction on B due to A when:-

(i) The wall is smooth but the surfaces of A and B in contact are rough and the system is in equilibrium

(ii) All the surfaces are rough

(p) upward

(q) downwards

(r) zero

(s) system cannot remain in equilibrium

Discussion

5.	An ac voltage is represented by E=220√2 cos(50π)t How many times will the current becomes zero in 1 s?
Answer» An ac voltage is represented by $E = 220 \sqrt{2} c o s (50 π) t$ How many times will the current becomes zero in 1 s?

Discussion

6.	A real image is formed by a mirror when:
Answer» A real image is formed by a mirror when:

Discussion

7.	A particle at rest starts moving with uniform acceleration covers a distances 114 meters in 8th second. The acceleration of the particle is
Answer» A particle at rest starts moving with uniform acceleration covers a distances $114$ meters in $8^{t h}$ second. The acceleration of the particle is

Discussion

8.	For uniform electric field, field lines are:
Answer» For uniform electric field, field lines are:

Discussion

9.	A discharge tube contains helium at a low pressure. A large potential difference is applied across the tube. consider a helium atom that has just been ionized due to the detachment of an atomic electron. Find the ratio of the distance travelled by the free electron to that by the positive ion in a short time dt after the ionization.
Answer» A discharge tube contains helium at a low pressure. A large potential difference is applied across the tube. consider a helium atom that has just been ionized due to the detachment of an atomic electron. Find the ratio of the distance travelled by the free electron to that by the positive ion in a short time dt after the ionization.

Discussion

10.	Splitting of spectral line in presence of electric field is called:
Answer» Splitting of spectral line in presence of electric field is called:

Discussion

11.	From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m/s with respect to the ground. Calculate the initial recoil velocity of the rifle.
Answer» From a rifle of mass $4$ kg, a bullet of mass $50 g$ is fired with an initial velocity of $35 m / s$ with respect to the ground. Calculate the initial recoil velocity of the rifle.

Discussion

12.	540 g of ice at 0o C is mixed with 540 g of water at 80o C. The final temperature of the mixture is
Answer» 540 g of ice at $0^{o} C$ is mixed with 540 g of water at $80^{o} C$ . The final temperature of the mixture is

Discussion

13.	Escape velocity does not depend on:
Answer» Escape velocity does not depend on:

Discussion

14.	If water is poured into an inverted hollow cone whose semivertical angle is given by argument of z1. The depth of water increases at a rate equal to the least value of \|z2+z3\| cm/s. The rate at which the volume of water increases when the depth is 9 cm is mπ cm3/s. Where z1=11+(√2i)2+√27i,z2=8+15i,\|z3\|=7, (i=√−1). The value of m is
Answer» If water is poured into an inverted hollow cone whose semivertical angle is given by argument of $z_{1}$ . The depth of water increases at a rate equal to the least value of $\| z_{2} + z_{3} \| c m / s$ . The rate at which the volume of water increases when the depth is $9 c m$ is $m π c m^{3} / s$ . Where $z_{1} = 11 + (\sqrt{2} i)^{2} + \sqrt{27} i, z_{2} = 8 + 15 i, \| z_{3} \| = 7$ , $(i = \sqrt{- 1})$ . The value of $m$ is

Discussion

15.	A rope of mass 5 kg is moving vertically with an upward force of 100 N acting at the upper end and a downward force of 70 N acting at the lower end. The tension at the midpoint of the rope is (Take g=10 m/s2)
Answer» A rope of mass $5 k g$ is moving vertically with an upward force of $100 N$ acting at the upper end and a downward force of $70 N$ acting at the lower end. The tension at the midpoint of the rope is (Take $g = 10 m / s^{2}$ )

Discussion

16.	Waves from two sources superpose on each other at a particular point, amplitude and frequency of both the waves are equal. The ratio of intensities when both waves reach in the same phase and when they reach with the phase difference of 90∘ will be
Answer» Waves from two sources superpose on each other at a particular point, amplitude and frequency of both the waves are equal. The ratio of intensities when both waves reach in the same phase and when they reach with the phase difference of $90^{\circ}$ will be

Discussion

17.	A sphere of mass m moving with a constant velocity u hits another stationary sphere of same mass. If e is the coefficient of restitution, then ratio of velocities of the two spheres v1v2 after collision will be
Answer» A sphere of mass m moving with a constant velocity $u$ hits another stationary sphere of same mass. If $e$ is the coefficient of restitution, then ratio of velocities of the two spheres $\frac{v_{1}}{v_{2}}$ after collision will be

Discussion

18.	An amount Q of heat is added to a monoatomic ideal gas in a process in which the gas performs a work of Q2 on its surrounding. Find equation of the process that monoatomic gas is undergoing.
Answer» An amount $Q$ of heat is added to a monoatomic ideal gas in a process in which the gas performs a work of $\frac{Q}{2}$ on its surrounding. Find equation of the process that monoatomic gas is undergoing.

Discussion

19.	The value of 1⋅ 20C0+2⋅ 20C1⋅ 30C1+1⋅ 20C0++3⋅ 20C2⋅ 30C2+…+21⋅ 20C20⋅ 30C20 is 50C20+20⋅ 49Cq, (where q is an even number), then qq+5 is
Answer» The value of $1 \cdot^{20} C_{0} + 2 \cdot^{20} C_{1} \cdot^{30} C_{1} + 1 \cdot^{20} C_{0} + + 3 \cdot^{20} C_{2} \cdot^{30} C_{2} + \dots + 21 \cdot^{20} C_{20} \cdot^{30} C_{20}$ is $^{50} C_{20} + 20 \cdot^{49} C_{q}$ , (where $q$ is an even number), then $\frac{q}{q + 5}$ is

Discussion

20.	In an isothermal reversible expansion if the volume of 96 g of oxygen at 27∘C is increased from 70 L of 140 L, then the work done by the gas will be
Answer» In an isothermal reversible expansion if the volume of $96 g$ of oxygen at $27^{\circ} C$ is increased from $70 L$ of $140 L$ , then the work done by the gas will be

Discussion

21.	A large plastic plate of area 40 m2 is floating on the surface of a river. Determine the tangential force that should be applied on the plastic plate to move the plate at 4 m/s on the surface of the river. The depth of the river is 2 m and coefficient of viscosity of water is 10−2 poise.
Answer» A large plastic plate of area $40 m^{2}$ is floating on the surface of a river. Determine the tangential force that should be applied on the plastic plate to move the plate at $4 m/s$ on the surface of the river. The depth of the river is $2 m$ and coefficient of viscosity of water is $10^{- 2}$ poise.

Discussion

22.	Can two different sources be coherent?why
Answer» Can two different sources be coherent?why

Discussion

23.	The displacement of the point of the wheel initially in contact with the ground, when the wheel rolls forward half a revolution will be (radius of the wheel is R)
Answer» The displacement of the point of the wheel initially in contact with the ground, when the wheel rolls forward half a revolution will be (radius of the wheel is $R$ )

Discussion

24.	A 100 kg block is started with a speed of 2.0 m s−1 on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. Calculate the change in the internal energy of the block-belt system as the block comes to a stop on the belt
Answer» A 100 kg block is started with a speed of $2.0 m s^{- 1}$ on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. Calculate the change in the internal energy of the block-belt system as the block comes to a stop on the belt

24.

A 100 kg block is started with a speed of 2.0 m s−1 on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. Calculate the change in the internal energy of the block-belt system as the block comes to a stop on the belt

Answer»

A 100 kg block is started with a speed of $2.0 m s^{- 1}$ on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20.

Calculate the change in the internal energy of the block-belt system as the block comes to a stop on the belt

Discussion

25.	Find the incorrect equation of motion.
Answer» Find the incorrect equation of motion.

Discussion

26.	A ball moving with velocity 2 ms−1 collides head-on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in ms−1) after collision will be
Answer» A ball moving with velocity $2 {ms}^{- 1}$ collides head-on with another stationary ball of double the mass. If the coefficient of restitution is $0.5$ , then their velocities (in ${ms}^{- 1}$ ) after collision will be

Discussion

27.	What is the difference between a linear motion and a translatory motion?
Answer» What is the difference between a linear motion and a translatory motion?

Discussion

28.	If \|→A×→B\|=√3 →A.→B , then value of \|→A+→B\| is
Answer» If $\| \to A \times \to B \| = \sqrt{3} \to A . \to B$ , then value of $\| \to A + \to B \|$ is

Discussion

29.	A body of mass 10 kg is dropped to the ground from a height of 10 metres. The work done by the gravitational force is g=9.8 m/sec2
Answer» A body of mass 10 kg is dropped to the ground from a height of 10 metres. The work done by the gravitational force is $g = 9.8 m / s e c^{2}$

Discussion

30.	The two opposite faces of a cubical piece of iron (thermal conductivity =0.2 CGS units) are at 100∘C and 0∘C in contact with ice. If the area of a surface is 4 cm2 and latent heat of fusion of ice is 80 J/g, then the mass of ice melted in 10 minutes will be
Answer» The two opposite faces of a cubical piece of iron (thermal conductivity $= 0.2 CGS units$ ) are at $100^{\circ} C$ and $0^{\circ} C$ in contact with ice. If the area of a surface is $4 {cm}^{2}$ and latent heat of fusion of ice is $80 J/g$ , then the mass of ice melted in $10$ minutes will be

Discussion

31.	Identify the electromagnetic waves whose wavelengths lie in the range (a) 1011<λ<10−14m (b) 10−4m<λ<10−6m Write one uses of each.
Answer» Identify the electromagnetic waves whose wavelengths lie in the range (a) $10^{11} < λ < 10^{- 14} m$ (b) $10^{- 4} m < λ < 10^{- 6} m$ Write one uses of each.

Discussion

32.	The diagram shows the biasing of an n-p-n transistor in common emitter configuration used in an amplifier. The design of the transistor is such that 98% of the charge carriers from emitter reach the collector. If base current changes from 50 μA to 100 μA, then the corresponding change in the voltage across the load resistance RL will be
Answer» The diagram shows the biasing of an n-p-n transistor in common emitter configuration used in an amplifier. The design of the transistor is such that $98 %$ of the charge carriers from emitter reach the collector. If base current changes from $50 μ A$ to $100 μ A$ , then the corresponding change in the voltage across the load resistance $R_{L}$ will be

Discussion

33.	Find the shortest distance between the skew – lines ¯r=(2+λ)^i−(1+2λ)^j+(1+3λ)^k and ¯r=(^i+2^j+3^k)+μ(3^i−2^j−^k)
Answer» Find the shortest distance between the skew – lines $¯ r = (2 + λ)^i - (1 + 2 λ)^j + (1 + 3 λ)^k a n d ¯ r = (^i + 2^j + 3^k) + μ (3^i - 2^j -^k)$

Discussion

34.	(a) What is linearly polarised light. Describe briefly using a diagram how sunlight is polarised. (b) Unpolarised light is incident on a polaroid. How would the intensity of transmitted light change when the polaroid is rotated?
Answer» (a) What is linearly polarised light. Describe briefly using a diagram how sunlight is polarised. (b) Unpolarised light is incident on a polaroid. How would the intensity of transmitted light change when the polaroid is rotated?

Discussion

35.	The minimum wavelength of x-rays emitted from x-ray machine operating at an accelerating potential of V volts is
Answer» The minimum wavelength of x-rays emitted from x-ray machine operating at an accelerating potential of V volts is

Discussion

36.	Four equal charges Q are placed at the four corners of a square of each side 'd'. Work done in removing a charge – Q from its centre to infinity is
Answer» Four equal charges Q are placed at the four corners of a square of each side 'd'. Work done in removing a charge – Q from its centre to infinity is

Discussion

37.	A uniform electric field of 10NC−1 exists in the vertically downward direction. Find the increase in the electric potential as one goes up through a height of 50 cm.
Answer» A uniform electric field of $10 N C^{- 1}$ exists in the vertically downward direction. Find the increase in the electric potential as one goes up through a height of 50 cm.

Discussion

38.	A small block of mass m and a concave mirror of radius R fitted with a stand lie on a smooth horizontal table with a separation d between them. The mirror together with its stand has a mass m. The block is pushed at t = 0 towards the mirror so that it starts moving towards the mirror at a constant speed V and collides with it. The collision is perfectly elastic. Find the velocity of the image (a) at a time t<dV, (b) at a time t>dV.
Answer» A small block of mass m and a concave mirror of radius R fitted with a stand lie on a smooth horizontal table with a separation d between them. The mirror together with its stand has a mass m. The block is pushed at t = 0 towards the mirror so that it starts moving towards the mirror at a constant speed V and collides with it. The collision is perfectly elastic. Find the velocity of the image (a) at a time $t < \frac{d}{V}$ , (b) at a time $t > \frac{d}{V}$ .

38.

A small block of mass m and a concave mirror of radius R fitted with a stand lie on a smooth horizontal table with a separation d between them. The mirror together with its stand has a mass m. The block is pushed at t = 0 towards the mirror so that it starts moving towards the mirror at a constant speed V and collides with it. The collision is perfectly elastic. Find the velocity of the image (a) at a time t<dV, (b) at a time t>dV.

Answer»

A small block of mass m and a concave mirror of radius R fitted with a stand lie on a smooth horizontal table with a separation d between them. The mirror together with its stand has a mass m. The block is pushed at t = 0 towards the mirror so that it starts moving towards the mirror at a constant speed V and collides with it. The collision is perfectly elastic. Find the velocity of the image

(a) at a time $t < \frac{d}{V}$ ,

(b) at a time $t > \frac{d}{V}$ .

Discussion

39.	The position of a boy moving along a straight line is x=150 m with respect to origin (x=0) at 10.30 a.m. If he is moving along +ve x−axis at a constant speed of 6 km/hr, what will be his position at the time 10.45 a.m ?
Answer» The position of a boy moving along a straight line is $x = 150 m$ with respect to origin $(x = 0)$ at $10.30 a.m$ . If he is moving along $+ v e x -$ axis at a constant speed of $6 km/hr$ , what will be his position at the time $10.45 a.m$ ?

Discussion

40.	Two masses M1 and M2 placed at a distance 'I' part,let the centre of mass of this system be at a point named C. If M1 is displaced by L1 towards C and M2 is displaced by L2 away from C, find the distance from C where the new centre of mass will be located.
Answer» Two masses M1 and M2 placed at a distance 'I' part,let the centre of mass of this system be at a point named C. If M1 is displaced by L1 towards C and M2 is displaced by L2 away from C, find the distance from C where the new centre of mass will be located.

Discussion

41.	The figure below shows the position of a ball at t = 0, t = 1s, t = 2s, t = 3s and t = 4s: Which of the graph below is a possible graph of the position x(t)?
Answer» The figure below shows the position of a ball at t = 0, t = 1s, t = 2s, t = 3s and t = 4s: Which of the graph below is a possible graph of the position x(t)?

41.

The figure below shows the position of a ball at t = 0, t = 1s, t = 2s, t = 3s and t = 4s: Which of the graph below is a possible graph of the position x(t)?

Answer»

The figure below shows the position of a ball at t = 0, t = 1s, t = 2s, t = 3s and t = 4s:

Which of the graph below is a possible graph of the position x(t)?

Discussion

42.	In the circuit shown, the reading of the ammeter is pq amp. What is the value of p + q? ___
Answer» In the circuit shown, the reading of the ammeter is $\frac{p}{q}$ amp. What is the value of p + q? ___

Discussion

43.	A block of mass 2.0 kg, initially at rest is pulled up on a smooth incline of angle 300 with the horizontal. If the block moves with an acceleration of 1.0 m/s2, find the power delivered by the pulling force at a time 4.0 s after the motion starts. What is the average power delivered during the 4.0 s after the motion starts?
Answer» A block of mass 2.0 kg, initially at rest is pulled up on a smooth incline of angle 30⁰ with the horizontal. If the block moves with an acceleration of 1.0 m/s², find the power delivered by the pulling force at a time 4.0 s after the motion starts. What is the average power delivered during the 4.0 s after the motion starts?

Discussion

44.	A galvanometer has resistance G and Current I_g produced full scale deflection. S1 is the value of the shunt which converts it into an ammeter of range 0 - I and S2 is the value of shunt for the range 0 - 2I. The ratio of S1 to S2 is
Answer» A galvanometer has resistance G and Current I_g produced full scale deflection. $S_{1}$ is the value of the shunt which converts it into an ammeter of range 0 - I and $S_{2}$ is the value of shunt for the range 0 - 2I. The ratio of $S_{1}$ to $S_{2}$ is

Discussion

45.	The voltage applied across an X-rays tube is nearly
Answer» The voltage applied across an X-rays tube is nearly

Discussion

46.	If the velocity of water wave v depends upon the wavelength λ, the density of water ρ and the acceleration due to gravity g, then which of the following options depicts correct relation dimensionally?
Answer» If the velocity of water wave $v$ depends upon the wavelength $λ$ , the density of water $ρ$ and the acceleration due to gravity $g$ , then which of the following options depicts correct relation dimensionally?

Discussion

47.	Three points masses, each of mass m are placed at the corners of an equilateral triangle of side l, Then the moment of inertia of this system about an axis along one of the side of the triangle is x times ml2. The value of x is
Answer» Three points masses, each of mass $m$ are placed at the corners of an equilateral triangle of side $l$ , Then the moment of inertia of this system about an axis along one of the side of the triangle is $x$ times $m l^{2}$ . The value of $x$ is

Discussion

48.	→A=2^i+3^j+^k and →=4^i+3^j. Magnitude of the component of vector →A along vector →B is .
Answer» $\to A = 2^i + 3^j +^k$ and $\to = 4^i + 3^j$ . Magnitude of the component of vector $\to A$ along vector $\to B$ is .

Discussion

49.	A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered is f1. If the train’s speed is reduced to 17 m/s, the frequency registered is f2. If the speed of sound is 340 m/s then the ratio f1f2 is
Answer» A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered is f1. If the train’s speed is reduced to 17 m/s, the frequency registered is $f_{2}$ . If the speed of sound is 340 m/s then the ratio $\frac{f_{1}}{f_{2}}$ is

Discussion

50.	The equivalent resistance between points a and b of a network shown in figure is given by
Answer» The equivalent resistance between points a and b of a network shown in figure is given by

50.

The equivalent resistance between points a and b of a network shown in figure is given by

Answer»

The equivalent resistance between points a and b of a network shown in figure is given by

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A particle travels 10 m in first 5 sec and 10 m in next 3 sec. Assuming constant acceleration what is the distance travelled in next 2 sec

In the given constraint, what will be the speed of block R (VR), if the string is inextensible and pulleys are frictionless?

A material has Poisson's ratio 0.5. If a uniform rod made of the material suffers a longitudinal strain of 2×10−3, what is the percentage increase in volume?

Find the friction on B due to A when:- (i) The wall is smooth but the surfaces of A and B in contact are rough and the system is in equilibrium (ii) All the surfaces are rough (p) upward (q) downwards (r) zero (s) system cannot remain in equilibrium

An ac voltage is represented by E=220√2 cos(50π)t How many times will the current becomes zero in 1 s?

A real image is formed by a mirror when:

A particle at rest starts moving with uniform acceleration covers a distances 114 meters in 8th second. The acceleration of the particle is

For uniform electric field, field lines are:

Splitting of spectral line in presence of electric field is called:

From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m/s with respect to the ground. Calculate the initial recoil velocity of the rifle.

540 g of ice at 0o C is mixed with 540 g of water at 80o C. The final temperature of the mixture is

Escape velocity does not depend on:

A rope of mass 5 kg is moving vertically with an upward force of 100 N acting at the upper end and a downward force of 70 N acting at the lower end. The tension at the midpoint of the rope is (Take g=10 m/s2)

Waves from two sources superpose on each other at a particular point, amplitude and frequency of both the waves are equal. The ratio of intensities when both waves reach in the same phase and when they reach with the phase difference of 90∘ will be

A sphere of mass m moving with a constant velocity u hits another stationary sphere of same mass. If e is the coefficient of restitution, then ratio of velocities of the two spheres v1v2 after collision will be

An amount Q of heat is added to a monoatomic ideal gas in a process in which the gas performs a work of Q2 on its surrounding. Find equation of the process that monoatomic gas is undergoing.

The value of 1⋅ 20C0+2⋅ 20C1⋅ 30C1+1⋅ 20C0++3⋅ 20C2⋅ 30C2+…+21⋅ 20C20⋅ 30C20 is 50C20+20⋅ 49Cq, (where q is an even number), then qq+5 is

In an isothermal reversible expansion if the volume of 96 g of oxygen at 27∘C is increased from 70 L of 140 L, then the work done by the gas will be

A large plastic plate of area 40 m2 is floating on the surface of a river. Determine the tangential force that should be applied on the plastic plate to move the plate at 4 m/s on the surface of the river. The depth of the river is 2 m and coefficient of viscosity of water is 10−2 poise.

Can two different sources be coherent?why

The displacement of the point of the wheel initially in contact with the ground, when the wheel rolls forward half a revolution will be (radius of the wheel is R)

A 100 kg block is started with a speed of 2.0 m s−1 on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. Calculate the change in the internal energy of the block-belt system as the block comes to a stop on the belt

Find the incorrect equation of motion.

A ball moving with velocity 2 ms−1 collides head-on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in ms−1) after collision will be

What is the difference between a linear motion and a translatory motion?

If |→A×→B|=√3 →A.→B , then value of |→A+→B| is

A body of mass 10 kg is dropped to the ground from a height of 10 metres. The work done by the gravitational force is g=9.8 m/sec2

The two opposite faces of a cubical piece of iron (thermal conductivity =0.2 CGS units) are at 100∘C and 0∘C in contact with ice. If the area of a surface is 4 cm2 and latent heat of fusion of ice is 80 J/g, then the mass of ice melted in 10 minutes will be

Identify the electromagnetic waves whose wavelengths lie in the range (a) 1011&lt;λ&lt;10−14m (b) 10−4m&lt;λ&lt;10−6m Write one uses of each.

Find the shortest distance between the skew – lines ¯r=(2+λ)^i−(1+2λ)^j+(1+3λ)^k and ¯r=(^i+2^j+3^k)+μ(3^i−2^j−^k)

(a) What is linearly polarised light. Describe briefly using a diagram how sunlight is polarised. (b) Unpolarised light is incident on a polaroid. How would the intensity of transmitted light change when the polaroid is rotated?

The minimum wavelength of x-rays emitted from x-ray machine operating at an accelerating potential of V volts is

Four equal charges Q are placed at the four corners of a square of each side 'd'. Work done in removing a charge – Q from its centre to infinity is

A uniform electric field of 10NC−1 exists in the vertically downward direction. Find the increase in the electric potential as one goes up through a height of 50 cm.

The position of a boy moving along a straight line is x=150 m with respect to origin (x=0) at 10.30 a.m. If he is moving along +ve x−axis at a constant speed of 6 km/hr, what will be his position at the time 10.45 a.m ?

Two masses M1 and M2 placed at a distance 'I' part,let the centre of mass of this system be at a point named C. If M1 is displaced by L1 towards C and M2 is displaced by L2 away from C, find the distance from C where the new centre of mass will be located.

The figure below shows the position of a ball at t = 0, t = 1s, t = 2s, t = 3s and t = 4s: Which of the graph below is a possible graph of the position x(t)?

In the circuit shown, the reading of the ammeter is pq amp. What is the value of p + q? ___

A galvanometer has resistance G and Current I_g produced full scale deflection. S1 is the value of the shunt which converts it into an ammeter of range 0 - I and S2 is the value of shunt for the range 0 - 2I. The ratio of S1 to S2 is

The voltage applied across an X-rays tube is nearly

If the velocity of water wave v depends upon the wavelength λ, the density of water ρ and the acceleration due to gravity g, then which of the following options depicts correct relation dimensionally?

Three points masses, each of mass m are placed at the corners of an equilateral triangle of side l, Then the moment of inertia of this system about an axis along one of the side of the triangle is x times ml2. The value of x is

→A=2^i+3^j+^k and →=4^i+3^j. Magnitude of the component of vector →A along vector →B is .

A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered is f1. If the train’s speed is reduced to 17 m/s, the frequency registered is f2. If the speed of sound is 340 m/s then the ratio f1f2 is

The equivalent resistance between points a and b of a network shown in figure is given by

Identify the electromagnetic waves whose wavelengths lie in the range (a) 1011<λ<10−14m (b) 10−4m<λ<10−6m Write one uses of each.