Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

A charged particle enters a magnetic field H with its initial velocity making an angle of 45° with H. Then the path of the particle will be:

A closely wound coil of 100 turns and area of cross-section  has a coefficient of self-induction 1 mH. The magnetic induction in the centre of the core of the coil when a current of 2A flows in it, will be

(a)

(b)

(c)

(d)

Two current carrying loops of same area but of different materials have same current flowing in them in anti-clockwise direction. if a magnetic field is applied in upward direction then potential energy of loop 1 and loop 2 will always be:

In  radio theraphy, X-rays are used to

(a) Detect bone fractures	(b) Treat cancer by controlled exposure
(c) Detect heart diseases	(d) Detect fault in radio receiving circuits

Two positive charges of 20 coulomb  and Q coulomb are situated at a distance of 60 cm. The neutral point between them is at a distance of 20 cm from the 20 coulomb charge. Charge Q is

(a) 30 C

(b) 40 C

(c) 60 C

(d) 80 C

In a nuclear reaction some mass converts into energy. In this reaction total B.E of reactants when compared with that of products is:

Value of potential at a point due to a point charge is

(a) Inversely proportional to square of the distance

(b) Directly proportional to square of the distance

(c) Inversely proportional to the distance

(d) Directly proportional to the distance

What is the correct order in which the listed atomic models were advanced and accepted, earliest first?

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20℃  ? The temperature of boiling water is 100℃

(a) 6.4 minutes

(b) 6.3 minutes

(c) 12.6 minutes

(d) 12.8 minutes