Magnetism And Matter — Physics STD 12 Science — Question

In the given figure the capacitors  have a capacitance 4mF each if the capacitor  has a capacitance 10mF, then effective capacitance between A and B will be

(a) 2mF

(b) 4mF

(c) 6mF

(d) 8mF

In Geiger-Marsden scattering experiment, the trajectory traced by an a-particle depends on:

Identify the material which is suitable for making standard resistors.

Hydrogen (H), deuterium (D), singly ionized helium ( and doubly ionized lithium (Li) all have one electron around the nucleus. Consider n =2 to n = 1 transition. The wavelengths of emitted radiations are  and   respectively. Then approximately

(a)	(b) 4
(c)	(d)

A current I is passed for a time t through a number of voltameters. If m is the mass of a substance deposited on an electrode and z is its electrochemical equivalent, then

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

In  nucleus, there are

(a) 138 protons and 88 neutrons	(b) 138 neutrons and 88 protons
(c) 226 protons and 88 electrons	(d) 226 neutrons and 138 electrons

What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm

(a) 0.001 rad

(b) 0.01 rad

(c) 1 rad

(d) 0.1 rad

Is the ratio of frequencies of UV rays and IR rays in the glass more than, less than or equal to 1?

A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed there are two positions of the lens to form real images.  If the heights of the images are 4 cm and 9 cm respectively, the height of the object is

(a) 2.25 cm

(b) 6.00 cm

(c) 6.50 cm

(d) 36.00 cm