Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be

(a) 4 volts

(b) 4 amperes

(c) 2 amperes

(d) 2 volts

Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R = 1 ohm.  If the internal resistance of battery A is 1.9 ohms and that of B is 0.9 ohm, what is the potential difference between the terminals of battery A

(a) 2 V

(b) 3.8 V

(c) Zero

(d) None of the above

A planet of mass M has a satellite of mass m, revolving around the planet in a circular orbit of radius r and time period T. The mass (M) of the planet is

(a)

(b)

(c)

(d)

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

(a) Each of these increases

(b) Each of these decreases

(c) Copper strip increases and that of germanium decreases

(d) Copper strip decreases and that of germanium increases

The sum of binary numbers 1011 and 110 is :

A charge q  is placed at the centre of the open end of cylindrical vessel. The flux of the electric field through the surface of the vessel is

(a) Zero

(b)

(c)

(d)

In Young's experiment, one slit is covered with a blue filter and the other (slit) with a yellow filter. Then the interference pattern

(a) Will be blue

(b) Will be yellow

(c) Will be green

(d) Will not be formed

In a lossless transformer an alternating current of  2 amp is flowing in the primary coil. The number of turns in the primary and secondary coils are 100 and 20 respectively. The value of the current in the secondary coil is

(a) 0.08 A

(b) 0.4 A

(c) 5 A

(d) 10 A

The radius of two metallic spheres A and B  are  and  respectively (. They are connected by a thin wire and the system is given a certain charge. The charge will be greater

(a) On the surface of the sphere B	(b) On the surface of the sphere  A
(c) Equal on both	(d) Zero on both