Electromagnetic Induction — Physics STD 12 Science — Question

If a ray of light is incident normally on a plane mirror then the value of the angle of reflection is:

Only paraxial rays are used in image formation by spherical mirror; because this:

Assertion   :  The magnetic filed at the ends of a very long current carrying solenoid is half of that at the center.
Reason      : If the solenoid is sufficiently long, the field within it is uniform.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

A 25 W, 220 V bulb and a 100 W, 220 V bulb are connected in parallel across a 440 V line(a) Only 100 watt bulb will fuse(b) Only 25 watt bulb will fuse(c) Both bulbs will fuse(d) None of the bulbs will fuse

If a 2 kW boiler is used everyday for 1 hour, then electrical energy consumed by boiler in thirty days is(a) 15 unit(b) 60 unit(c) 120 unit(d) 240 unit

The magnetic susceptibility is

The pressure p and volume V of an ideal gas both increase in a process.

1. Such a process is not possible.
2. The work done by the system is positive.
3. The temperature of the system must increase.
4. Heat supplied to the gas is equal to the change in internal energy.

Which of the following is not a mode of radioactive decay(a) Positron emission(b) Electron capture(c) Fusion(d) Alpha decay

A bar magnet is moved along the axis of a copper ring placed far away from the magnet, Looking from the side of the magnet an anticlockwise current is found to be induced in the ring. Which of the following may be true?