When three identical bulbs of \(60~\text{watts}\) and \(200~\text{volt}\) rating are connected in series to a \(200~\text{volt}\) supply, the power drawn by them will be:
1. \(180~\text{watt}\)
2. \(10~\text{watt}\)
3. \(20~\text{watt}\)
4. \(60~\text{watt}\)

The electric resistance of a particular wire of iron is \(R.\) If its length and radius are doubled, then:

What properties will a galvanometer that is acting as a voltmeter have?

Resistances \(n,\) each of \(r~\text{ohm},\)  when connected in parallel give an equivalent resistance of \(R~\text{ohm}.\) If these resistances were connected in series, the combination would have resistance in \(\text{ohms}\) equal to:
1. \(\dfrac{R}{n^2}\)
2. \(\dfrac{R}{n}\)
3. \(nR\)
4. \(n^2R\)

Two springs of spring constants \(k_1\) and \(k_2\) are joined in series. The effective spring constant of the combination is given by:
1. \(\frac{k_1+k_2}{2}\)
2. \(k_1+k_2\)
3. \(\frac{k_1k_2}{k_1+k_2}\)
4. \(\sqrt{k_1k_2}{}\)

Of the diodes shown in the following diagrams, which one of the diodes is reverse biased?
 

1.		2.
3.		4.

A car is moving towards a high cliff. The car driver sounds a horn at a frequency of 'f'. The reflected sound heard by the driver has a frequency of 2f. If 'v' is the velocity of sound, then the velocity of the car, in the same velocity units, will be:
1. v/3
2. v/4
3. v/2
4. v/$\sqrt{2}$

The density of a newly discovered planet is twice that of Earth. If the acceleration due to gravity on its surface is the same as that on Earth, and the radius of Earth is \(R,\) what will be the radius of the new planet?