Nuclei — Physics STD 12 Science — Question

One end of a metal rod is dipped in boiling water and the other is dipped in melting ice:

1. All parts of the rod are in thermal equilibrium with each other.
2. We can assign a temperature to the rod.
3. We can assign a temperature to the rod after steady state is reached.
4. The state of the rod does not change after steady state is reached.

Number of spectral lines in hydrogen atom is:

Which of the following statements is not correct according to Rutherford model?

The SI unit of capacitance is:

The work done in bringing a 20 coulomb charge from point A to point B for distance 0.2m is 2J. The potential difference between the two points will be (in volt)

(a) 0.2

(b) 8

(c) 0.1

(d) 0.4

A student plots a graph from his reading on the determination of Young modulus of a metal wire but forgets to put the labels. the quantities on X and Y axes may be respectively:

1. Weight hung and length increased.
2. Stress applied and length Increased.
3. Stress applied and strain developed.
4. Length increased and the weight hung.

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Which of the following systems may be adequately described by classical physics?

To make the field radial in a moving coil galvanometer

(a) The number of turns in the coil is increased

(b) Magnet is taken in the form of horse-shoe

(c) Poles are cylindrically cut

(d) Coil is wounded on aluminium frame

Identify the logic gate in figure.

The graph between the instantaneous concentration (N)  of a radioactive element and time (t)  is

(a)

(b)

(c)

(d)