If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
(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.
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
co-ordinate bonds
electrovalent bonds
a substance free of bonds
covalent bonds
Correct answer is D
It's generally created using silicon, germanium, or other pure elements.
Semiconductors are created by adding impurities to the element.
The conductance or inductance of the element depends on the type and intensity of the added impurities.
The electrons surrounding each atom in a semiconductor are part of a covalent bond
The main factor which affects the speed of sound wave is the?
properties of the medium
amplitude of the sound wave
intensity of the sound wave
loudness of the sound wave
Correct answer is A
Factors Affecting The Speed of Sound
2.5 KW
80 KW
25 KW
50 KW
Correct answer is D
where force = f, mass = m, acceleration = a, velocity = v, time = t
Force = m * a → m * \(\frac{Δv}{t}\)
Power = f * v
P = m * \(\frac{v}{t}\) * v = m * \(\frac{v^2}{t}\)
p = \(\frac{1600 * 25^2}{20}\)
p = 50,000 or 50 KW
7.06 x 10\(^{3}\)J
5.38 x 10\(^{3}\)J
6.72 x 10\(^{3}\)J
1.35 x 10\(^{3}\)J
Correct answer is C
quantity of heat = mass * Specific latent heat → 20 * 336
quantity of heat = 6720j or 6.72 x 10\(^{3}\)J
The graph of pressure (P) against the reciprocal of the volume (I/V) in Boyles's law is a?
hyperbola
parabola
curve
straight line
Correct answer is D
The graph of pressure (P) against the reciprocal of the volume (I/V) is a straight line passing through the origin.
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