A. Wall
B. Tower
C. Hour
2.The imaginary axis at which the earth rotates remains inclined at an angle of ____ to the plane of earth's orbit.
A. 44 1/2 º
B. 55 1/2 º
C. 66 1/2 º
D. 0 º
3.There is 20 volt across the inductor and 15 volt across the resistance in the a.c. supplied series R-L circuit. What would be the supply voltage?
A. 20 volt
B. 15 volt
C. 25 volt
D. 17.5 volt
4.Super conductivity is a phenomenon in which the resistance of a substance
A. increases with temperature
B. decreases with temperature
C. does not change with temperature
D. becomes zero at very low temperature
5.Once the active medium is excited, the first photons of light are produced by which physical process?
A. Blackbody radiation
B. Spontaneous emission
C. Synchrotron radiation
6.Which among the following sentence is correct reason behind the blue color of ocean water?
A. Water molecules absorb all other colors except blue
B. Impurities in Sea water reflect the blue light
C. Water molecules scatter the blue light
7.The ratio of flux density and capacity of magnetic field in a medium is represented by
A. Magnetic density
B. Acceptance
C. Influence
D. Permeability
8.The magnetic effect of electric current was first observed by
A. Henry
B. Oersted
C. Faraday
D. Volta
9.To convert moving coil galvanometer into an ammeter, which of the following methods is used?
A. Small resistance in series
B. Small resistance in parallel
C. High resistance in series
D. High resistance in parallel
10.The instrument used to measure thickness of thin glass plates is ?
A. Vernier calipers
B. screw gauge
C. Scale
D. Tape
11.Which of the following is used to measure height?
A. Barometer
B. Planometer
C. Altimeter
D. Hydrometer
12.We can hold a pen due to the—
A. Force of gravity
B. Force of friction
C. Force of weight
D. Work done by our muscles
13.The items amenable to detection by soft x-rays are
A. contrabands
B. lead in bullets
C. Narcotics
D. genuine coins from counterfeit coins
14.The heat required to raise the temperature of body by 1 K is called
A. specific heat
B. thermal capacity
C. water equivalent
D. None of the above
15.The velocity of sound in air (under normal condition) is
A. 30 m/sec
B. 320 m/sec
C. 343 m/sec
D. 3,320 m/sec
16.Which energy resides in motion ?
A. Potential energy
B. Kinetic energy
C. Nuclear energy
17.The scientist who announced the universal law of gravitation?
A. Louis Pasteur
B. C.V. Raman
C. Faraday
D. Issac Newton
18.What is the process responsible for producing photons in a diode laser?
A. Fermi level shift
B. Majority carrier injection
C. Carrier freeze out
D. Electron-hole recombination
19.The magnetic field generated due to magnetic storm is directed in the ____ direction to the earth's main field.
A. same
B. opposite
C. southward
D. northward
20.At which temperature, Celsius and Fahrenheit scales will show same reading ?
A. 0 degree
B. 32 degree
C. 180 degree
D. minus 40 degree
21.What is the unit of Radiation Dosage?
A. Gy
B. RDy
C. RCy
22.At what temperature does Water boil?
A. 75 Degree F
B. 100 Degree F
C. 212 Degree F
D. 98 Degree F
23.Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
A. move towards A
B. move towards B
C. move at right angles to the line joining A and B
D. remain at rest
24.Optical fibre works on the
A. principle of refraction
B. total internal reflection
C. scattering
D. interference
25.The two elements that are frequently used for making transistors are
A. boron and aluminium
B. silicon and germanium
C. iridium and tungsten
D. niobium and columbium
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