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Hard Questions
Basic Science
General Knowledge
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How many feet are in a football field that is 100 yards?
Hard
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>
What is the unit of viscosity? Please explain.
Hard
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>
Two particles of equal mass (m) each move in a circle of radius (r) under the action of their mutual gravitational attraction the speed of the particle is
A
4
r
G
m
B
2
1
r
G
m
C
2
r
4
G
m
D
r
G
m
Hard
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>
The dimensions of Planck's constant is
A
M
2
L
2
T
−
1
B
M
2
L
T
−
2
C
M
L
2
T
−
1
D
M
L
2
T
−
2
Hard
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>
Is angular momentum equal to Inertia
×
ω
and why?
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>
Choose the correct answer from the alternatives given.
Time period is the time taken to complete one oscillation. This definition of time period is true for
A
longitudinal Wave
B
transverse Wave
C
simple Pendulum
D
All the above
Hard
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>
How do vectors work in physics?
Hard
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>
A block of mass 10 kg is placed at a distance of 5 m from the rear end of a long trolleyes shown in figure. The coefficient of friction between the block and the surface below is 0.2. Starting from the rest, the trolley is given a uniform acceleration of 3 ms. At what distance from the starting point will block fall off the trolley! Take
g
=
1
0
m
s
−
3
A
15 m
B
20 m
C
25 m
D
30 m
Hard
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>
A uniform cylinder of mass
m
=
8
.
0
k
g
and radius
R
=
1
.
3
c
m
(Fig.) starts descending at a moment
t
=
0
due to gravity. Neglecting the mass of the thread, find:
(a) the tension of each thread and the angular acceleration of the cylinder.
(b) the time dependence of the instantaneous power developed by the gravitational force.
Hard
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>
How was it determined that a parsec is
3
.
2
6
light years?
Hard
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>