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51.

Photocell works on the principle ofA. Raman effectB. Compton effectC. Seeback effectD. Photoelectric effect

Answer» Correct Answer - D
Discussion
52.

Who discovered the principle of inertia ?A. NewtonB. GallieoC. Tycho BraheD. Kepler

Answer» Correct Answer - B
Discussion
53.

Who invented the cyclotron ?A. James ChadwickB. James Clerk MaxwellC. Michael FaradayD. Ernest Orlando Lawrence

Answer» Correct Answer - D
The cyclotron was invented by Ernest Orlando Lawrence
Discussion
54.

Who invented wireless telegraphy ?A. MaxwellB. MarconiC. HertzD. Faraday

Answer» Correct Answer - B
Discussion
55.

Electron microscope is used forA. spinB. wave natureC. negative chargeD. none of these

Answer» Correct Answer - B
Discussion
56.

Inverse square law of distance is followed byA. Gravitational forcesB. Electromagnetic forcesC. Both (a) and (b)D. Neither (a) and nor (b)

Answer» Correct Answer - C
Both gravitational and electromagnetic forces follow inverse square law of distance.
Discussion
57.

While measuring acceleration due to gravity by simpe pendulum a student makes a positive error of 1% in the length of the pendulum and a negative error of 3% in the value of the time period. His percentage error in the measurement of the value of g will be -A. `2%`B. `4%`C. `7%`D. `10%`

Answer» Correct Answer - C
`T= 2pi sqrt((l)/(g)) rArr g = (4pi^(2) l)/( T^(2))`
`(Delta g)/(g) xx 100 = (Delta l)/(l ) xx 100 + (2 Delta T)/(T) xx 100`
`" "= 1 % + 2(3 % ) = 7%`
Discussion
58.

Assertion: The acceleration due to gravity on the moon is one-sixth that on the earth. Reason : The law of gravitation is the same on both the moon and the earth.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - B
The laws of nature are the same everywhere in the universe, but the phenomena may differ from place to place because of different conditions at different locations.
Discussion
59.

The acceleration due to gravity on the moon isA. `((1)/(6))^(th)` that of the earthB. same that of the earthC. `((1)/(3))^(rd)` that of the earthD. `((1)/(5))^(th)` that of the earth

Answer» Correct Answer - A
The acceleration due to gravity on the moon is `((1)/(6))^(th)` that of the earth
Discussion
60.

Assertion : A stone and a feather dropped from the same height do not reach the ground at the same time. Reason : Acceleration due to gravity is dependent on the mass of the object.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - C
Acceleration due to gravity is independent of the mass of the object. The stone and feather dropped from the same height do not reach the ground at the same time because of air resistance.
Discussion
61.

Dimensional formula of magnetic field is :-A. `M^(1)L^(2)T^(-1)A^(-1)`B. `M^(1)L^(0)T^(-2)A^(-1)`C. `M^(1)L^(-2)T^(-1) A^(-1)`D. `M^(1)L^(1)T^(-2)A^(-1) `

Answer» Correct Answer - B
[B] = `([F])/([il]) = [ (MLT^(-2))/(AL)] = MA^(-1)T^(-2) `
Discussion
62.

Using mass (M), length (L), time (T) and current (A) as fundamental quantities, the dimensions of permeability are :A. `[M^(-1)LT^(-2)A]`B. `[ML^(-2)T^(-2)A^(-1)]`C. `[MLT^(-2)A^(-2)]`D. `[MLT^(-1)A^(-1)]`

Answer» Correct Answer - C
Units of permeability are equivalent to `N//("amp")^(2)` thus dimensions are = `([M^(1)L^(1)T^(-2)])/([A^(2)]) = [M^(1)L^(1)T^(-2)A^(-2)]`
Discussion
63.

Find dimension formula of polarisation ?A. `[L^(-2)T^(1)A^(1)]`B. `[L^(2) T^(1)A^(-1)]`C. `[L^(2)T^(1)A^(1)]`D. `[L^(-3)T^(-1)A^(1)]`

Answer» Correct Answer - A
Polarisation = `("Dipole moment")/("Volume")= (p)/(V)`
`rArr ["Polarisation"] = [ (ATL)/(L^(3))] = [L^(-2)T^(1)A^(1)]`
Discussion
64.

Taking foce, length and time to be the fundamental quantities find the dimension of a. density, b. pressure, c. momentum and d. energy

Answer» Correct Answer - (a) `[M^(0)L^(0)T^(0)K^(1)]`
(b) `[ML^(2) T^(-2)]`
(c ) `[ML^(-1)T^(-2)]`
(d) `[M^(0)L^(0)T^(-1)]`
(a) [Temperature] = [K]
(b) KE = `(1)/(2) mv^(2)`
`rArr [KE] = [m] [v]^(2) = M(LT^(-1))^(2) = [ML^(2)T^(-2]`
(c ) P `= (F)/(A) rArr [P] = ([F]) /( [A]) = (MLT^(-2)) /(L^(2)) = [ML^(-1)T^(-2)]`
(d) `omega = (v)/(r ) rArr [omega] = ([v]) /([r]) = (LT^(-1))/(L) = [T^(-1)]`
Discussion
65.

The equation of a wave is given by `Y = A sin omega((x)/(v) -k)` where `omega` is the angular velocity and v is the linear velocity. The dimension of k isA. `[LT]`B. `[T]`C. `[T^(-1)]`D. `[T^(2)]`

Answer» Correct Answer - B
Dimensionally `k= (x)/(v) = ([L])/([LT^(-1)]) = [T^(1)]`
Discussion
66.

Which does not has the same unit as othersA. watt-sB. kilowatt-hourC. eVD. J-s

Answer» Correct Answer - D
Discussion