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Work and Energy
100
Dynamics
87
Kinematics
98
Transfer of Heat
51
Turning Effect of Forces
62
Gravitation
46
Matter Properties
94
Thermal Properties of Matter
103
Atomic and Nuclear Physics
101
Basic Electronics
101
Current Electricity
187
Electromagnetism
101
Electrostatics
123
Geometrical Optics
204
Information and Communication Technology
100
Simple Harmonic Motion and Waves
96
Sound
108
Show/Hide Answers
Atomic and Nuclear Physics
The release of energy from the sun is due to
nuclear fission
nuclear fusion
burning of gases
chemical reaction
Author:
rikazzz
Comment
Physics
Ultrasound devices operate with minimum frequency from
20kHz
35 kHz
45 kHz
60 kHz
Ultrasound devices operate with minimum frequency from 20kHz.
Author:
rikazzz
Comment
Simple Harmonic Motion and Waves
The time T of the simple harmonic motion of a mass m attached to a spring is given by
T = 2π √(k/m)
T = 2π √(m/k)
T = π √(k/m)
T = 2π √(m+k)
Author:
rikazzz
Comment
Physics
It is easier to roll a barrel full of coal tar than to pull it because
the full weight of the barrel comes into play when it is pulled
the rolling friction is much less than the sliding friction
more surface area of the barrel is in contact with the road when it is pulled
coal tar is a liquid and it flows in the barrel when it is rolled
When a body slides (moves with all its surface area in contact) over another body, the resistance faced is due to sliding friction. Hence rolling friction is less than the sliding friction. Thus it is easier to roll a barrel full of coal tar than to pull it.
Author:
rikazzz
Comment
Current Electricity
The wire maintained at zero potential by connecting it to the Earth at the power station itself is called
Earth/ground wire
livewire
neutral wire
delta wire
Author:
rikazzz
Comment
Kinematics
The spinning of the body about its axis is
rotatory
circular
translational
vibratory
Author:
rikazzz
Comment
Electrostatics
If q
1
 and q
2
 are the magnitudes of two charges, r is the distance between the two charges, k is the constant of proportionality then coulomb’s force F between the two charges is equal to
k(q
1
q
2
)/r
2
k(q
1
q
2
)/r
k(q
1
q
2
) + r
2
k(q
1
q
2
) + r
Author:
rikazzz
Comment
Information and Communication Technology
To produce a computer-based information system, we must together
5 parts
3 parts
2 parts
4 parts
Author:
rikazzz
Comment
Physics
The blue colour of water in the sea is due to
Absorption of other colours except blue by water molecules
Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water
Reflection of blue sky by sea water
The ocean is blue because water absorbs colours in the red part of the light spectrum. Like a filter, this leaves behind colours in the blue part of the light spectrum for us to see. The ocean may also take on green, red, or other hues as light bounces off of floating sediments and particles in the water.
Author:
rikazzz
Comment
Everyday Science
In the human eye, pictures are recorded by
cornea
pupil
retina
iris
Author:
rikazzz
Comment
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