2J
20J
100J
1000J
2000J
Correct answer is A
No explanation has been provided for this answer.
In which of the following fields is repulsion NOT experienced?
Electrical only
Gravitational only
Magnetic only
Magnetic and electrical
Magnetic and gravitational
Correct answer is B
No explanation has been provided for this answer.
Which of the following statements about the pressure in a liquid is NOT correct? It
acts in all direction
changes with the material of the container
is the same at all points in the same horizontal plane
varies with the density of the liquid
varies with the depth of the liquid
Correct answer is B
No explanation has been provided for this answer.
220
222
224
226
228
Correct answer is B
The equation above is Beta-decay:
where β is an electron → \(^{0} _{-1}e\)
2β in the equation = \(^{0} _{-1}e\) + \(^{0} _{-1}e\) → \(^{0} _{-2}e\)
\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + \(^{0} _{-2}e\) + energy
where \(^{x}_{88}Ra\) + \(^{0} _{-2}e\) → \(^{222}_{86}Rn\)
: x = 222 for element Radon [ \(^{222}_{88}Ra\)
Which of the following substances undergoes sublimation?
Ether
Ice
Iodine
Naphthalene
Turpentine
Correct answer is C
No explanation has been provided for this answer.
The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by
condensation
conduction
convection
evaporation
radiation
Correct answer is C
No explanation has been provided for this answer.
957m
1914m
3828m
8700m
17400m
Correct answer is B
VELOCITY=DISTANCE/TIME
Distance = 330×5.8 Distance = 1914m
The wave theory of light does not explain photoelectricity because
light waves carry little energy
particles cannot be emitted by waves
the frequency of light waves too high
there is a threshold wavelength for electron emission
the wavelength of Light waves is too short
Correct answer is A
- According to wave theory, after the light falls on a substance electrons are emitted after a small instant of time. However, in photoelectric effect, the electron emissions are immediate without a time delay.
- The energy of a wave increases with increase in intensity. However, in photoelectirc effect, increase in intensity has no effect on the energy of electrons emitted. All that happens is the number of electrons emitted, increases.he energy of a wave grows as its intensity increases. In the photoelectronic effect, however, increasing the intensity has no influence on the energy of electrons released.
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
energy is applied by some external agencies
frictional forces dissipate the energy of motion
the frequency of oscillation increases with the mass of the bob
the frequency of oscillation varies with time
the period of oscillation varies with time.
Correct answer is D
The amplitude and the frequency of an oscillating pendulum decrease gradually with time.
I only
II only
III only
I and II only
I, II and III
Correct answer is C
The quality or timbre of sound is that characteristic which enables us to distinguish one sound from another having the same pitch and loudness.
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