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An alternating voltage of 260 volt and ω =100 radian/second, is applied in an LCR series circuit where L=0.01 H, C=4×10^−4, F and R = 10Ω . The power supplied by the source is:

a) 6760 W b) 3380 W c) 1000 W d) 3000 W Solution:c) 1000 W Explanation:... View Article

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor

a) b) 1 c) 2 d) Solution: d) Explanation:... View Article

A particle is moved from (0,0) to (a,a) under a force F=3i+4j from two paths. Path 1 is OP and path 2 is QOP. Let W1 and W2 be the work done by this force in two paths. Then :

a) W1=2W2 b) W1=W2 c) W2=2W1 d) W1=4W2 Solution: b) W1=W2 Explanation: As force F=3hat{i}+4hat{j}is continuous and a conservation force. The... View Article

A 1.0 m long metallic rod is rotated with an angular frequency of 400 rad s−1 about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field of 0.5 T parallel to the axis exists everywhere. Calculate the EMF developed between the centre and the ring.

Solution:... View Article

In order to raise a mass of 100 kg, a man of mass 60 kg fastens a rope to it and passes the rope over a smooth pulley. He climbs the rope with acceleration 5g/4 relative to the rope.The tension in the rope is (take g=10ms^2)

Solution:... View Article

The rms value of the electric field of light coming from a source is 1000 n/c. the average total energy density of the electromagnetic wave is

(a) (b) (c) (d) Solution: (b) Explanation:Total average energy = Total average energy = Total average energy =... View Article

Which of the following statement(s) is/are true: An electron and a proton are moving on straight parallel paths with same velocity. They enter a semi-infinite region of uniform magnetic field perpendicular to the velocity.

1. They will never come out of the magnetic field region. 2. They will come out travelling along parallel paths. 3. They will come out at the... View Article

A cart of mass M has a block of mass m attached to it, the coefficient of friction between the block and the cart is μ. What is the maximum acceleration of the cart so that the block m does not fall (a) [latex]\frac{\mu}{g}[/latex] (b) [latex]\mu g[/latex] (c) [latex]\frac{g}{\mu}[/latex] (d) [latex]\frac{M\mu g}{m}[/latex]

Answer: (b) Given Mass of the cart = M Mass of the block = m Coefficient of friction = μ Let acceleration of the cart = a Pseudo force... View Article

A thermal power plant produces electric power of 600kW at 4000 V, which is to be transported to a place 20 km away from the power plant for consumers’ usage. It can be transported either directly with a cable of large current carrying capacity or by using a combination of step-up and step-down transformers at the two ends. The drawback of the direct transmission is the large energy dissipation. In the method using transformers, the dissipation is much smaller. In this method, a step-up transformer is used at the plant side so that the current is reduced to a smaller value. At the consumers’ end, a step-down transformer is used to supply power to the consumers at the specified lower voltage. It is reasonable to assume that the power cable is purely resistive and the transformers are ideal with power factor unity. All the currents and voltages mentioned are rms values. If the direct transmission method with a cable of resistance 0.4 Ω km−1 is used, the power dissipation (in %) during transmission is

20 b) 30 c) 40 d) 50 Solution: b) 30 Explanation: R=0.4*20 = 8Omega... View Article

Two forces each numerically equal to 10 dynes are acting as shown in the following figure, then their resultant is

a) 1 dyne b) 20 dynes c) 10 dynes d) 10sqrt{3} dynes Solution:c) 10 dynes Explanation: The angle θ between the two vector is 120... View Article

The capacity of a pure capacitor is 1 farad. In dc circuits, its effective resistance will be?

a) 0.5 Ohm b) 1 Ohm c) Infinite d) Zero Solution:c) Infinite Explanation: As for DC frequency is 0, = = Infinite... View Article

A voltmeter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10 V, then the required resistance in series will be?

a) 8000Omega b) 4000Omega c) 6000Omega d) 2000Omega Solution: d) 2000Omega Explanation: n=10/2=5 R=(n−1)G =(5−1)2000 =8000Ω... View Article

Two artificial satellites of masses m1 and m2 are moving with speeds v1 and v2 in orbits of radii r1 and r2 respectively. If r1>r2 then which of the following statements is true.

a) b) c) d) Solution: a) Orbital velocity is given by the formula: for r1>r2 ⟹v2>v1... View Article

M	T	W	T	F	S	S
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30	31

Archives

An alternating voltage of 260 volt and ω =100 radian/second, is applied in an LCR series circuit where L=0.01 H, C=4×10^−4, F and R = 10Ω . The power supplied by the source is:

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor

A particle is moved from (0,0) to (a,a) under a force F=3i+4j from two paths. Path 1 is OP and path 2 is QOP. Let W1 and W2 be the work done by this force in two paths. Then :

In order to raise a mass of 100 kg, a man of mass 60 kg fastens a rope to it and passes the rope over a smooth pulley. He climbs the rope with acceleration 5g/4 relative to the rope.The tension in the rope is (take g=10ms^2)

The rms value of the electric field of light coming from a source is 1000 n/c. the average total energy density of the electromagnetic wave is

Which of the following statement(s) is/are true: An electron and a proton are moving on straight parallel paths with same velocity. They enter a semi-infinite region of uniform magnetic field perpendicular to the velocity.

Two forces each numerically equal to 10 dynes are acting as shown in the following figure, then their resultant is

The capacity of a pure capacitor is 1 farad. In dc circuits, its effective resistance will be?

A voltmeter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10 V, then the required resistance in series will be?

Two artificial satellites of masses m1 and m2 are moving with speeds v1 and v2 in orbits of radii r1 and r2 respectively. If r1>r2 then which of the following statements is true.

Convert 37 to the base 10 into binary

Definition of point in geometry

Find the measure of angle b.

Check whether 7329753 is divisible by 9

47 in binary is equal to

What is x squared?

Express 0.16 as a fraction

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