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Revise all concepts, definitions, laws,
formulae and units
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Tables of 1 to 30 squares and square
roots of 1 to 30 cubes of 1 to 10
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Questions of Deep Knowledge
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1 Which of the following quantities have unit, but not the dimensions.
(a) dielectric constant
(b) coefficient of viscosity
(c) plane angle
(d) refractive index
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2. A block of mass 10kg is resting on a horizontal surface. A force of 50N is applied on it. If coefficient of friction between the block and the surface is 0.6. what will be the force of friction? (g = 10 m/s2)
(a) Zero
(b) 50 N
(c) 60 N
(d) 40 N
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CORRECT OPTION IS
(b) 50 N
fs = mgμ
fs = 10×10×0.6
fs = 60N
But applied force is 50N.
Hence, the block will not move.
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Questions of Presence of mind
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1. Three tuning forks of frequencies 400 H2, 401 Hz and 402 Hz are
sounded together. How many beats will be heard?
(a) 3
(b) 5
(c) 6
(d)1
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2. Three tuning forks of frequencies 400Hz, 401Hz and 402H2 are
sounded together. How many beats will be produced?
(a) 3
(b) 5
(c) 6
(d)1
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Solution:
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g
Rcos
R cos
g
R cos2
g
1 g
2 R cos
3. A hemispherical bowl of radius R is revolved around its vertical axis. A Light weight sphere in it also revolves in it, without sliping. The radius of the hemispherical passing through the sphere makes angle θ with the axis of rotation. The angular velocity of the sphere is:
(a) (b)
(c) (d)
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Solution:Motion of the sphere is like motion of conical pendulum.Hence R cos
T 2g
2but T
2 R cos2
g
g
R cos
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Questions on application mind
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1.Charge q moves around charge Q in circular path. The work done by charge Q on q is
(a) (b)
(c) Zero (d)
20
1 Qq
4 k r 0
1 q
4 k r
20
1 Qq2 r
4 k r
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Solution: Charge q is moving over an equipotential surface Hence, work done is zero.
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2. Time taken by radio waves to go come back from communication satellite is nearly
(a) 1s (b)
(c) (d) 4s
1s
4
1s
8
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Height of communication satellite above the surface of the earth is 36000 km.
∴ Distance travelled by radio waves = 72000 km
Velocity of radio waves = 3 × 108 m/s
8
6
6
72000kmtime
3 10 m / s
72 10 1time
300 10 4
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Full Portion Tests
Time Table
Time Allotment
Mistakes
Confidence
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Thank
you ...!