Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Angular  width (b) of central maximum of a diffraction pattern on a single slit does not depend upon(a) Distance between slit and source(b) Wavelength of light used(c) Width of the slit(d) Frequency of light used

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves:

A transformer is used to(a) Change the alternating potential (b) Change the alternating current(c) To prevent the power loss in alternating current flow (d) To increase the power of current source

In a head-on elastic collision of two bodies of equal masses:

1. The velocities are interchanged.
2. The speeds are interchanged.
3. The momenta are interchanged.
4. The faster body slows down and the slower body speeds up.
5. All of the above.

Assertion  :   The earth’s magnetic field is due to iron present in its core.
Reason      : At a high temperature magnet losses its magnetic property or magnetism.(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 assertion is false but reason is true.

A pellet carrying charge of 0.5 coulombs is accelerated through a potential of 2,000 volts. It attains  a kinetic energy equal to(a) 1000 ergs(b) 1000 joules(c) 1000 kWh(d) 500 ergs

For harder X-rays:

1. The wavelength is higher.
2. The intensity is higher.
3. The frequency is higher.
4. The photon energy is higher.

In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption (a) Ultraviolet(b) Microwaves(c) Infrared(d) Radio waves