Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

What parameter is used to measure the stability of a nucleus?

A series combination of two resistors 1 W each is connected to a 12 V battery of internal resistance 0.4 W.  The current flowing through it will be

(a) 3.5 A

(b) 5 A

(c) 6 A

(d) 10 A

For television broadcasting, the frequency employed is normally

(a) 30-300 MHz

(b) 30-300 GHz

(c) 30-300 KHz

(d) 30-300 Hz

The hyper-metropia is a

(a) Short-side defect	(b) Long- side defect
(c) Bad vision due to old age	(d) None of these

A coil of insulating wire is connected to battery. If it is moved towards a galvanometer then its point gets deflected because.

Figure shows three points A, B and C in a region of uniform electric field .  The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where  and  represent the electric potential at points  A, B and C respectively

(a)

(b)

(c)

(d)

In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure.  The value of the resistance is

(a) 2.2 k W

(b) 3.3 k W

(c) 5.6 k W

(d) 9.1 k W

A virtual and enlarged image of the object forms:

20 μA current flows for 30 seconds in a wire, transfer of charge will be

(a) 2

(b) 4

(c) 6

(d) 8

A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in parallel across a 220 volt line. Which bulb will glow more brightly

(a) 25 watt bulb	(b) 100 watt bulb
(c) Both will have same brightness	(d) First 25 watt then 100 watt