Which one of the following does TV remote control unit use to operate a TV set?

(A) Light waves
(B) Sound waves
(C) Microwaves
(D) Radio waves

A liquid drop tends to assume a spherical shape because of

(A) surface tension
(B) elastic force
(C) gravitational force
(D) viscous force

Ultraviolet light of sun’s radiation is prevented from reaching the earth’s atmosphere by the layer of

(A) oxygen
(B) hydrogen
(C) ozone
(D) helium

A noise level of 100 decibel would correspond to

(A) sound from a noisy street
(B) just audible sound
(C) noise from a machine shop
(D) ordinary conversation

Water drops do not stick to the oily surface due to

(A) lack of adhesive force
(B) surface tension
(C) cannot mix each other
(D) water is lighter than oil

Doppler effect is independent of

(A) velocity of source
(B) velocity of listener
(C) distance between source and observer
(D) None of the above

When the frequency distribution is normal

(A) mean, mode and median are identical
(B) median, mode and mean are ail different from one another
(C) mean is greater than mode
(D) mean is greater than median

The surface tension phenomenon is the result of the tendency of a system to

(A) conserve volume
(B) keep surface area minimum
(C) keep potential energy minimum
(D) conserve energy

Match List I (Frequency Range) with List ll (Uses) and select the correct answer.
List 1——— List II
A. 54 MHz to 890 MHz 1. Television waves
B. 1710 kHz to 54 MHz 2. Shortwave
C. 88 MHz to108 MHz 3. FM radio
D. 300 MHz to 3000 MHz 4. U H F band
Codes
ABCD

(A) 1 2 3 4
(B) 4 3 2 1
(C) 3 4 2 1
(D) 2 1 3 4

When light waves pass from air to glass the variables affected are

(A) wavelength, frequency and velocity
(B) velocity and frequency
(C) wavelength and frequency
(D) wavelength and velocity

A liquid will not wet the surface of solid if the angle of contact is

(A) obtuse
(B) acute
(C) ?/2
(D) zero

With the propagation of a longitudinal wave through a material medium, the quantities transferred in the direction of propagation are

(A) energy and momentum
(B) energy, momentum end mass
(C) energy and mass
(D) energy

Sound waves do not exhibit the phenomenon of

(A) refraction
(B) interference
(C) polarization
(D) diffraction

Meniscus of mercury in a capillary is

(A) plane
(B) cylindrical
(C) concave
(D) convex

Sound wave cannot pass through above

(A) a solid-liquid mixture
(B) an idea! gas
(C) a liquid gas mixture
(D) a perfect vacuum

Stationary waves are so called because in them

(A) same occurs no flow of energy
(B) the interference effect can’t be observed
(C) the particles of the medium are not disturbed at all
(D) the particles of the medium do net execute SHM