141- In Compton Scattering experiment the X-ray wavelength change \(\Delta\lambda\) is ______. Here h is Plank constant, m is rest mass of electron and θ is angle after scattering.
A. \(\Delta\lambda\)= h/moc(1+cosθ)
B. \(\Delta\lambda\)= h/moc(1-cos^8)
C. \(\Delta\lambda\)= h/moc(1-cosθ)
D. \(\Delta\lambda\)= h/moc'(1-cosθ)
View Answer
Answer : C. \(\Delta\lambda\)= h/moc(1-cosθ)
Description
142- An object is falling down with a speed of 20 m/s. After 3 seconds its velocity will be ______ m/s (g=10 m/s^2).
A. 05
B. 50
C. 55
D. 95
View Answer
Answer : B. 50
Description
143- In Young's double slit experiment, if d is separation between two slits, λ is wavelength of light and θ is angle of line from center of slits to the point of observation on the screen; then for maxima (bright fringe); the formula is:
A. 2dsinθ = mλ; m = 0, 1, 2,
B. dsinθ = mλ; m = 0, 1, 2,
C. dsinθ = (m+1/2)λ; m = 0, 1, 2,
D. 2msinθ=dλ; m = 0, 1, 2,
View Answer
Answer : B. dsinθ = mλ; m = 0, 1, 2,
Description
144- The polarization of light by tourmaline crystals is due to ______ effect.
A. selective diffraction
B. selective reflection
C. selective interference
D. selective absorption
View Answer
Answer : D. selective absorption
Description
145- A paratrooper is falling down with uniform velocity and also rotating with a constant angular velocity of 0.2 rad/sec. The body satisfies ______.
A. First condition of equilibrium but not second
B. Second condition of equilibrium but not first
C. First and second condition of equilibrium
D. Neither First nor the second condition of equilibrium
View Answer
Answer : A. First condition of equilibrium but not second
Description
146- If 92U235 decays by emitting two a,one B and two gamma rays the new daughter element y is = ______.
A. 88y²²⁷
B. 89y²²⁷
C. 90y²²⁷
D. 89y²³¹
View Answer
Answer : C. 90y²²⁷
Description
147- A changing current in a coil sets up a changing magnetic field around it which in turn induces an e.m.f. in it. This effect is known as ______.
A. Simple induction
B. Mutual induction
C. Self-Induction
D. EMF induction
View Answer
Answer : C. Self-Induction
Description
148- The principle of an AC generator is ______.
A. Lenz’s law
B. Faraday’s law
C. Self-Induction
D. Ampere’s law
View Answer
Answer : B. Faraday’s law
Description
149- A material that does NOT become radioactive after absorbing neutrons is called ______.
A. Shielding
B. Reactor fuel
C. Coolant
D. Control material
View Answer
Answer : D. Control material
Description
150- The Bragg’s Law for measurement of wave length \(\lambda\) of x-rays, using crystal lattice planes having distance d between each other, for constructive interference for integral multiple of \(\lambda\) is ______.
A. m\(\lambda\) = 2dsinθ
B. m\(\lambda\) = 2d/sinθ
C. 2\(\lambda\) = mdsinθ
D. d\(\lambda\) = 2msinθ
View Answer
Answer : A. m\(\lambda\) = 2dsinθ
Description
151- The velocity of particle is related to time according to equation v=ct^3. The dimensions of constant c are ______.
A. L·T^-1
B. LT^-3
C. LT^-4
D. L·T^-3
View Answer
Answer : C. LT^-4
Description
152- What should the distance of an object from a convex lens of focal length f=10 cm in order to produce an erect image twice as large as the object?
A. 20 cm from the lens
B. 15 cm from the lens
C. 10 cm from the lens
D. 05 cm from the lens
View Answer
Answer : D. 05 cm from the lens
Description
153- The scalar or Dot product of Vectors (3i-2j+4k) and (2i+2j-3k) is ______.
A. -9
B. -10
C. -11
D. 10
View Answer
Answer : B. -10
Description
154- The sum of Kinetic Energy and the Potential Energy is always constant provided ______ motion.
A. there is greater force of friction involved during
B. body is in simple harmonic
C. there is less force of friction Involved during
D. no force of friction involved during
View Answer
Answer : B. body is in simple harmonic
Description
155- Three times decrease in the distance between the plates of a parallel plate capacitor will ______.
A. decrease the capacitance three times
B. decrease the capacitance nine times
C. increase the capacitance three times
D. increase the capacitance six times
View Answer
Answer : C. increase the capacitance three times
Description
156- A car of mass 1200 Kg initially at rest has been accelerated to speed of 8 m/s in 16 meters. Average acceleration of car is ______ m/s^2 and Force is ______ N.
A. 1.5 and 1500
B. 2.5 and 2400
C. 3.5 and 3500
D. 2 and 2400
View Answer
Answer : D. 2 and 2400
Description
157- In SI system of units, the fundamental units of length, mass, and time are ______, ______ and ______ respectively.
A. Meter, Kilogram and Kilo-second
B. Kilometer, Kilogram and Hour
C. Meter, Kilogram and Second
D. Centimeter, Centigram and Second
View Answer
Answer : C. Meter, Kilogram and Second
Description
158- In Nuclear Physics the mass defect is referred to ______.
A. difference in masses of free neutron and proton
B. difference in masses of free neutrons and bonded nucleus
C. difference between atomic mass and atomic number
D. difference in masses of free nuclear constituent and bonded nucleus
View Answer
Answer : D. difference in masses of free nuclear constituent and bonded nucleus
Description
159- The formula for Paschen series for Hydrogen spectrum is ______.
A. 1/λ=RH (1/2² – 1/n²); n=3,4,5…
B. 1/λ=RH (1/1² – 1/n²); n=2,3,4,5…
C. 1/λ=RH (1/4² – 1/n²); n=5,6,7…
D. 1/λ=RH (1/3² – 1/n²); n=4,5,6…
View Answer
Answer : D. 1/λ=RH (1/3² - 1/n²); n=4,5,6...
Description
160- The necessary condition for the Boyle’s law to hold is that the process must be ______.
