(i), (iii) and (iv) only
(i), (ii) and (iv) only
(ii), (iii) and (iv) only
(i), (ii) and (iii) only
Correct answer is B
Electrical conduction of gas is applied in:
(i) The identification of gases
(ii) Lighting/fluorescent tubes
(iii) Advertising industry/Neon signs
(iv) Cathode ray oscilloscope/T.V. tubes
The property of wave shown in the diagram above is?
Diffraction
Refraction
Polarisation
Interference
Correct answer is A
Diffraction is the bending of waves around the corners of an obstacle or through an aperture.
√3
\(\frac{√3}{2}\)
\(\frac{1}{√2}\)
\(\frac{1}{√3}\)
Correct answer is D
A body sliding down a plane inclined at 30o to the horizontal,
Has coefficient of friction = tan 30º or \(\frac{1}{√3}\)
The mercury column in the barometer at notational atmospheric pressure has a height of?
0.76 cm at see level
760 cm at sea level
7.6 cm at sea level
76 cm at sea level
Correct answer is D
The height of the mercury column serves as an indicator of atmospheric pressure. At sea level and at a temperature of 0° Celsius (C), the height of the mercury column is approximately 30 inches, or 76 centimeters. This represents a pressure of approximately 14.7 psia. The 30-inch column is used as a reference standard.
One of the following is a scalar quantity?
weight
momentum
potential energy
displacement
Correct answer is C
Examples of scalar quantities are mass, energy, distance, charge, volume, time, speed, and the magnitude of physical vectors in general
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