Sound — Physics STD 10 — Question

Name and state the law which determines the direction of induced current.

or

State Fleming’s right-hand rule.

How does the angle of deviation produced by a prism depend on the colour of light used? Which colour of white light is deviated (i) most, (ii) least, by a prism?

State three properties of α-rays.

Two resistors P and Q of the same material and length but of different thickness are connected in parallel to a battery. The cross- sectional area of P is twice that of Q. What is the ratio of
(a) The resistance of P to the resistance of Q?
(b) The current in P to the current in Q?

A pendulum with bob of mass m is oscillating on either side from its resting position A between the extremes B and C at a vertical height h and A. what is the kinetic energy K and potential energy U when the pendulum is at position (i) A, (ii) B and (iii) C?

(i) An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an alpha particle and is transformed into a nucleus B.
(a) What is the composition of B ?
(b) The nucleus B emits a beta particle and is transformed into a mucleus C. What is the composition of C?
(c) What is mass number of the nucleus A ?
(d) Does the composition of C change if it emits gamma radiations?
(ii) (a) Define fusion.
(b) Define fission.
(iii) (a) What is meant by Radioactivity?
(b) What is meant by nuclear waste?
(c) Suggest one effective way for the safe disposal of nuclear waste.

Point out two main disadvantages of ‘Tree System’.

What is the effect on the atomic mass and the atomic number of a radioactive element, after the emission of an α-particle?