Nuclei — Physics STD 12 Science — Question

 Identify the electromagnetic wave which is also known as heatwaves.

When  undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of   undergoes fission

(a) 9

(b) 9

(c) 9

(d) 9

The relation between a and b parameters of current gains for a transistors is given by

(a) α =

(b) α =

(c) α =

(d) α =

Which of the following statements can help you to determine the direction of induced current in Electromagnetic Induction?

A 6kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is.

When cells are connected in parallel, then

(a) The current decreases	(b) The current increases
(c) The e.m.f. increases	(d) The e.m.f. decreases

The Avogadro's number is 6  per gm mole and electronic charge is 1.6 . The Faraday's number is

(a)	(b)
(c)	(d)

A positively charged ball hangs from a silk thread. We put a positive test charge  at a point and measure F/, then it can be predicted that the electric field strength E

(a)

(b)

(c)

(d) Cannot be estimated

A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of the material is

(a) 4.4	(b) 2.2
(c) 1.1	(d) 0.22

6 A particle of charge q and mass m moves rectilinearly under the action of electric field E = A – Bx, where A and B are positive constants and x is distance from the point where particle was initially at rest then the distance travelled by the particle before coming to rest and acceleration of particle at that moment are respectively: