The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an AC supply of 20 V, 50 Hz. The secondary will have an output
Two ions of the same charge and energy but different mass are passing through a uniform magnetic field. The radii of their paths are proportional to
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A satellite revolving round the earth, the required centripetal force is provided by—
The colour sequenece in a carbon resistor is red, brown, orange and silver. The resistance of the resistor
An air capacitor of capacity C = 10μ F is connected to a constant voltage battery of 12 volt. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is
A 6 V battery is connected to the terminals of a 3 m long wire of uniform thickness and of resistance 100 Ω. The potential difference between two points on the wire, separated by a distance of 50 cm will be
In an ideal transformer, the voltage and the current in the primary are 200 V, 2A and that in the secondary are 2000 V, 1A. The value of is (in A).
The current in a choke changes from 0 to 10 A in 5 seconds. If the inductance of the choke is 2H the induced emf is
Which scientist experimentally proved the existance of electromagnetic waves?
Three capacitors each of capacity 4 μF are to be connected in such a way that their effective capacitance is 6 μF. This can be done by connecting
A cube of weight 10N rests on a rough inclined plane of slope 3 in 5. The coefficient of friction is 0.6. The minimum force necessary to start the cube moving up the plane is
When a glass rod is rubbed with silk, both become charged due to
If a person moves from the pole to the equator, the value of his weight will
Two stars of mass m1 and m2 are parts of a binary star system. The radii of their orbits are r1 and r2 respectively, measured from the C.M. of the system. The magnitude of gravitational force m1 exerts on m2 is
If the temperature of a hot body is increased by 50% then the increase in the quantity of emitted heat radiation will be
In Young's double slit experiment, interference was observed, when air was present in the interference chamber. If the chamber is evacuated and the same light is used, then we will see
The kinetic energy per gm mol for a diatomic gas at room temperature is
An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at 20 cm from the straight wire would be
A conductor of length l carrying current i is placed perpendicular to magnetic field of induction B. The force experienced by it is
If a diamagnetic subsatnce is brought near north or south pole of a bar magnet it is
A bar magnet is held perpendicular to a uniform magentic field. If the torque acting on the magnet is to be halved by rotating it, then angle by which it is to be rotated, is
A current carrying rectangular coil is placed in a uniform magnetic field. In which orientation, the coil will not tend to rotate?
If a substance is to be paramagnetic, its atoms must have a
In a container, the velocity of water flowing through a hole at a depth h from the surface of water is 5 m-s⁻1. If the container has the hole at a depth 4h from the surface of water, then velocity of water flowing through the hole is
Soap bubbles can be formed floating in air by blowing soap solution in air, with the help of a glass tube, but not water bubbles. It is because
The normal density of gold is ρ and its bulk modulus is K. The increase in density of a lump of gold, when a pressure P is applied uniformly on all sides, is
A particle starts from rest, accelerates at 2 m/s2 for 10s and then goes for constant speed for 30s and then decelerates at 4 m/s2 till it stops. What is the distance travelled by it
A mass 1 kg is suspended by a thread. It is (1) lifted up with an acceleration 4.9 m/s2 (ii) lowered with an acceleration 4.9 m/s2 The ratio of the tensions is
Which of the following is more effective in inducing nuclear fission