06/2019

2.

3.

6.

7.

Maximum : 100 Marks
Time : 1 hour and 15 minutes

Lorentz force law 18;
(ക) F=q(VxB+E) (B) F=gE+VxB
(0) F=q(VxB)+E യ F=q(VxE+B)

Two simple harmonic motions, y) = A sinwt and y, = A coswt are superimposed on a particle of
mass m. The total mechanical energy of the particle is :

ல பணிக்‌ ட) ணக?

€ மலக்‌ (D) മജ

If p is the density of the material of a wire and o the breaking stress, the greatest length of the
wire that can hang freely without breaking is :

(A) 20/pg 0) ೧/೮8
)© 0826 D) 6೧8
How many times more intense is 90 dB sound than 40 dB sound ?
ക്ട ‏رم‎ 0
(€) 500 o 10°
Current per unit area in a direction perpendicular to the flow is :
(A) Surface current density (B) Volume current density
(¢ Electric current (D) Surface charge density

Two coherent monochromatic light beams of intensities I and 41 are superimposed. The maximum
and minimum intensities in the resulting beam are :

(A) अ भाता © ‏1٠‎
‎)© 1 © ‏قد اہ‎ जा
Orbital motion of electrons accounts for the phenomenon ‏کہ‎
‎(A) Paramagnetism (B) Ferromagnetism
(C) Diamagnetism (D) All of the above

A rigid container with thermally insulated walls contains a coil of resistance 100 ohm carrying
current 1 ampere. Change in internal energy after 5 minutes will be :

(ಯ Zero ൫ 10 kilojoule
€ 20 kilojoule (D) 30 kilojoule
3 06/2019

[P.T.O.]