Q#1:- A portable device which is widely used for the detection of ionizing particle or radiations:
Solid state dector
Geiger counter ( Right Answer)
Wilson cloud chamber
All of these
None of these
Q#02:- 1 Kwh=
6×10^2 Joule
6×10^5 Joule
6×10^6 Joule
36×10^5 Joule ( Right Answer)
36×10^4 Joule
Q#03:- The essential part/s of a moving coil galvanometer is/are:
(I) A U-Shaped permanent magnet with cylindrical concave pole-pieces (II) A flat coil of thin enamel insulated wire usually rectangular (II) An spiral metallic wire connected to external terminal
I only
I & II only ( Right Answer)
I, II & III
II & III
III only
Q#04:- Calculate the centripetal acceleration and centripetal force on a man whose mass is 80 kg when resting on the ground at the equator if the radius of earth is 6.4×10^6 m.
69 N
35 N
69 N ( Right Answer)
65 N
78 N
Q#05:- The process of combining audio frequency (a-f) and radio frequency (r-f) waves to accomplish translational is called:
Transmission
Rectifier
Modulation ( Right Answer)
Crystal Diode
Carrier Signal
Q#06:- A convex lens of focal length 20 cm, is used to form an erect image which is twice as long as the object. Find the position of the object?
10 cm ( Right Answer)
20 cm
-20 cm
5 cm
-30 cm
Q#07:- The electron acquires a speed of 10^6 ms^-1. Find its energy in electron volts:
66 ev
84 ev ( Right Answer)
23 ev
34 ev
68 ev
Q#08:- A basic electric instrument which is used for the detection (or measurement) of small current:
Ammeter
Voltmeter
Galvanometer ( Right Answer)
Transmeter
All of these
Q#09:-ΔV/ΔS is the rate of change of potential with respect to the distance and it is called:
Electric field
Electric flux
Potential Difference
Potential Gradient ( Right Answer)
Electric intensity
The resonant frequency of an LC-Circuit is:
f = 2Π LC
f = 1 / 2Π√ LC
f = 1/ 2LC
None of these
Q#10:- Which one of the following is NOT needed in Nuclear Fission reactor?
fuel
accelerator
moderator
None of these
Q#11:- A Watt – sec is a unit of:
Force
Energy
Power
None of these
Q#12:- The force on a charge moving with the velocity in a magnetic field B is given by:
F = (q/v x B)
F = ( qv x B )
F = (qv + B)
None of these
Q#13:- The half life of a radioactive isotope is 140 days. How many days would it take to loose 3/4 of its
Initial activities:
105 days
280 days
35 days
None of these
Q#14:- A U-235 nucleus will split when it captures:
an α-particle
m. radiation
neutron
None of these
Q#15:- An LRC Circuit has R= 4Ω, Xc = 3 and XL=6, the impedance of the circuit is:
5 Ω
7 Ω
13 Ω
None of these
Q#16:- A magnetic field cannot:
Accelerate a charge
Exert a force on a charge
Change the kinetic energy of a charge
None of these
Q#17:-For hydrogen atom the energy needed to ionize it is____________ electron volts and the corresponding ionization potential is____________.
6 volts, 6 volts
12 volts, 12.6 volts
6 volts, 13 volts
6 volts, 13.6 volts ( Right Answer)
Q#18:-The length of a measuring rod is 1 m when it is at rest. What will its length be if it is moving with a velocity one third of the speed of light.
943 m ( Right Answer)
346 m
64 m
563 m
321 m
Q#19:-A changing current “i” in any circuit induces an emf “e” in that circuit, which is equal to:
e = di/dt
E = i dΦ/dt
e = – L di/dt
None of these
Q#20:-The resonant frequency of an LC-Circuit is:
f = 2Π LC
f = 1 / 2Π√ LC
f = 1/ 2LC
None of these
Q#21:- The induced current always flows in such a direction as to oppose the change which is giving rise to it, This state of:
Ampere’s law
Ohm’s law
Newton’s law
Hook’s law
Lenz’s law ( Right Answer)
Q#22:- A neutron travels a distance of 12 m in a time interval of 3.6×10^-4 s. Assuming its speed was constant, find its kinetic energy. Take 1.7×10^-27 kg as the mass of neutron.
87 ev
78 ev ( Right Answer)
56 ev
-8.56 ev
25 ev
Q#23:- The energy stored in the fossil fuel is
chemical energy ( Right Answer)
heat energy
Electrical energy
Elastic potential energy
Q#24:- Electrochemical energy is required for the working of
Circulatory system
Nervous system ( Right Answer)
Excretory system
Digestive system
Q#25:- A vector has a magnitude of 12. When its tail is at the origin it lies between the positive x
axis and the negative y axis and makes an angle of 30◦ with the x axis. Its y component is:
6/√3
−6√3
6
−6 ( Right Answer)
12
Q#26:- The hydraulic automobile jack illustrates:
Archimedes’ principle
Pascal’s principle ( Right Answer)
Hooke’s law
Newton’s third law
Newton’s second law
Q#27:- What is the magnifying power of a convex lens of focal length 5 cm?
3
5
6 ( Right Answer)
20
Q#28:- Which portion of light has a wavelength in a range from 400 to 780 nm, with a frequency range of 405 to 790 Hz?
infrared light
visible light ( Right Answer)
ultra-violet light
none of the above
Q#29:- Candela is a unit of
acoustic intensity
electric intensity
luminous intensity ( Right Answer)
magnetic intensity
Q#30:- Which are different types of emission spectrum?
continuous spectrum
line spectrum
band spectrum
all of the above ( Right Answer)