Nuclei — Physics STD 12 Science — Question

the anode is kept at positive potential with respect to the cathode:

Point charges +4q, -q  and +4q  are kept on the x - axis at points x = 0, x = a  and x = 2a respectively, then(a) Only q is in stable equilibrium(b) None of the charges are in equilibrium(c) All the charges are in unstable equilibrium(d) All the charges are in stable equilibrium

A silver and zinc voltameter are connected in series and a current i is passed through them for a time t liberating W gm of zinc. The weight of silver deposited is nearly(a) W       (b) 1.7 W(c) 2.4 W(d) 3.5 W

The image which can be obtained on a screen is called:

A current of 5 ampere is flowing in a wire of length 1.5 metres. A force of 7.5 N acts on it when it is placed in a uniform magnetic field of 2 Tesla. The angle between the magnetic field and the direction of the current is (a) 30°(b) 45°(c) 60°(d) 90°

The three basic properties possessed by the electric charge are:

In the options below which one of the isotope of the uranium can cause fission reaction?

Potentiometer measures the potential difference more accurately than a voltmeter because:

A far sighted man who has lost his spectacles, reads a book by looking through a small hole (3-4 mm) in a sheet of paper. The reason will be(a) Because the hole produces an image of the letters at a longer distance (b) Because in doing so, the focal length of the eye lens is effectively increased  (c)  Because in doing so, the focal length of the eye lens is effectively decreased(d) None of these