Current Electricity — Physics STD 12 Science — Question

Which of the following will change the time period as they are taken to moon?

1. A simple pendulum.
2. A physical pendulum.
3. A torsional pendulum.
4. A spring-mass system.

A parallel plate air capacitor is charged to a potential difference of V. After disconnecting the battery, distance between the plates of the capacitor is increased using an insulating handle. As a result, the potential difference between the plates

(a) Decreases

(b) Increases

(c) Becomes zero

(d) Does not change

A free neutron decays to a proton but a free proton does not decay to a neutron. This is because:

When the convergent nature of a convex lens will be less as compared with air

(a) In water

(b) In oil

(c) In both (a) and (b)

(d) None of these

By placing the prism in minimum deviation position, images of the spectrum

(a) Becomes inverted

(b) Becomes broader

(c) Becomes distinct

(d) Becomes intensive

1 mg gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is

(a) 0.91 mg

(b) 0.25 mg

(c) 0.5 mg

(d) 0.125 mg

Why is the Wheatstone bridge better than the other methods of measuring resistances?

Joining of light nuclei of elements to form a heavy nucleus with the release of energy is called: