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A sinusoidal voltage v = 200 sin 314t is applied to a resistor of 10ω resistance. Calculate (i) rms value of the voltage (ii) rms value of the current (iii) power dissipated as heat in watt

A sinusoidal voltage v = 200 sin 314t is applied to a resistor of 10ω resistance. Calculate (i) RMS value of the voltage (ii) RMS value of the... View Article

The surface energy of a liquid drop is u it is sprayed into 1000 equal droplets, then total surface energy becomes – (1) u (2) 10 u (3) 100 u (4) 1000 u

The surface energy of a liquid drop is u it is sprayed into 1000 equal droplets, then total surface energy becomes - (a) u (b) 10 u (c) 100 u... View Article

The magnetic susceptibility of a medium is 0.825

The magnetic susceptibility of a medium is 0.825. Its relative permeability is (a) 1.825 (b) 2.085 (c) 4.885 (d) 0.825 Answer: (a) 1.825... View Article

The electron drift speed is small and stars of the electron is also small but still we obtain a large current in the conductor this is due to

The electron drift speed is small and stars of the electron is also small but still we obtain a large current in the conductor this is due to (a)... View Article

In a particular system the units of length, mass and time are chosen to be 10 cm, 10 g, and 0.1 s respectively. The units of force in this system will be equal to ?

The units of force in this system will be equal to? (a) 1 N (b) 100 N (c) 10 N (d) 0.1 N Answer: (d) 0.1 N... View Article

Assertion: It is not possible to see a virtual image by eye. Reason: The rays that seem to emanate from a virtual image do not in fact emanates from the image.

(a) Both assertion and reason are true (b) Both assertion and reason are false (c) Assertion is true but reason is false (d) Assertion is false... View Article

A fireman wants to slide down a rope.the ropee can bear a tensiomn of 80% of the weight of the man. With what minmuum acclearation shoud the foreman slide down?

A fireman wants to slide down a rope. The ropee can bear a tension of 74% of the weight of the man. With what minmuum acclearation shoud the... View Article

A force f = 3x+4 displaces an object of mass 10kg from x=0 to x=4m if the speed of the object at x=0 is 2m/sec it’s speed at x=4m will be

It's speed at x=4m will be (a) m/s (b) m/s (c) 3 m/s (d) 4 m/s Answer: m/s... View Article

12 identical rods made of same material are arranged in the form of a cube. The temperature of ‘p’ and ‘r’ are maintained at 90 and 30 repsectively. The temperature of ‘v’ in steady state is

12 identical rods made of the same material are arranged in the form of a cube. The temperature of 'p' and 'r' are maintained at 90 °C and 30 °C... View Article

A step down transformer reduces the voltage of transmission line from 2200 V to 220 V. The power delivered by it is 8800 W and its efficiency is 88%. The input current is

A step-down transformer reduces the voltage of the transmission line from 2200 V to 220 V. The power delivered by it is 8800 W and its efficiency... View Article

A solid conducting sphere having a charge q is surrounded by an uncharged concentric conducting hollow spherical shell

A solid conducting sphere having a charge q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential... View Article

An aircraft moves 400m towards north 300m towards west and then 1200m vertically upward then its displacement from the initial position is

An aircraft moves 400m towards the north, 300m towards the west, and then 1200m vertically upward. Then its displacement from the initial... View Article

Is it easier to push or pull a body over a rough surface? Explain your answer.

We push or pull an object on a surface against the friction between the surface and the object. The frictional force increases as the normal... View Article

In a wheatstone’s bridge all the four arms have equal resistance r. If the resistance of the galvanometer arm is also r, the equivalent resistance of the combination as seen by the battery is

In a Wheatstone's bridge, all four arms have equal resistance r. If the resistance of the galvanometer arm is also r, the equivalent resistance... View Article

The emf of a cell is always greater than its terminal voltage. Why?

The EMF of a cell is greater than its terminal voltage because there is some potential drop across the cell due to its small internal resistance.... View Article

The temperature coefficient for a reaction is two. By how many times does the rate of reaction increase if the temperature of the reaction is increased from 340 k to 380 k?

The temperature coefficient for a reaction is two. How many times does the rate of reaction increase if the temperature of the reaction is... View Article

Water is falling on the blades of a turbine from a height of 40m if speed

Water is falling on the blades of a turbine from a height of 40m. If the speed of the river before the fall is 10 m/s and the area of the blade... View Article

Microwave oven acts on the principle of a) giving rotational energy to water molecules b) giving translational energy to water molecules c) giving rotational

Microwave oven acts on the principle of a) giving rotational energy to water molecules b) giving translational energy to water molecules c)... View Article

Which of the following is incorrect?

Which of the following is incorrect? (a) The dimension of a derived quantity is never zero in any base quantity (b) The dimension of a base... View Article

Which of the following is not true?

Which of the following is not true? (a) At large distances, the electric dipole potential varies as 1/r. (b) Electrostatic potential varies as... View Article

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