Q. Tides are primarily a result of the -
1) Attraction of the moon
2) Farrel's Law
3) Ocean currents
4) Pressure system of the earth
Q. To correct his/her vision, a person suffering from short-sightedness will have to use -
1) Convex lens
2) Concave lens
3) Convex mirror
4) Bifocal Lens
Q. Newton's 1st Law is the law of -
1) Inertia
2) Force
3) Momentum
4) Acceleration
Q. Electric fuse wire is made of alloys because alloys -
1) Have low melting point
2) Have high melting point
3) Are economical
4) Do not get heated easily
Q. Which two colours can be mixed to make green?
1) Yellow and Balck
2) Yellow and Blue
3) Orange and Violet
4) Purple and Yellow
Q. The conduction current in a chemical cell is -
1) By Positive and negative ions
2) By Positive ions
3) By Negative ions
4) By Positive Holes
Q. When beams of red, blue and green lights fell on the same spot, the colour of the light becomes -
1) white
2) violet
3) red
4) yellow
Q. How many units of electricity will be consumed if you use a 60 watt electric bulb for 5 hours everyday for 30 days ?
1) 12
2) 9
3) 6
4) 3
Q. The radioactive isotope used to control leukemia is -
1) Phosphorus 32
2) Cobalt 60
3) Iodine 131
4) Sodium 24
Q. Nucleus of helium contains -
1) only one proton
2) two proton
3) two proton and two neutrons
4) one proton and two neutrons
Q. The unit of electrical resistance of a conductor is -
1) farad
2) volt
3) ampere
4) ohm
Q. The 'parsec' is the unit of -
1) Distance
2) Time
3) Energy
4) Temperature
Q. To which theory of conservation is related the 'first' law of thermodynamics?
1) Charge
2) Momentum
3) Energy
4) Matter
Q. Which Uranium isotope is used in nuclear power plants to produce electricity ?
1) U-233
2) U-234
3) U-238
4) U-239
Q. A satellite in vacuum -
1) Is kept in orbit by remote control
2) Is kept in orbit by retro-rocket
3) Derives energy from gravitational field
4) Does not require any energy for orbiting
Q. The nuclear force is -
1) Short range repulsive force
2) Short range attractive force
3) Long range repulsive force
4) Long range attractive force
Q. According to kinetic theory gases, at the temperature absolute zero, the gas molecules -
1) Start movement
2) Become massless
3) Start emitting light
4) Stop movement
Q. The speed of sound in water is four times its speed in air. When a sound wave of frequency 'n' and wavelength 'λ' enters from air into water, then its frequency and wavelength will respectively become -
1) 4n and λ
2) n and 4λ
3) 2n and λ
4) None of these
Q. The required DC voltage for arc welding is -
1) 6 to 9 V
2) 50 to 60 V
3) 200 to 250 V
4) 90 to 100 V
Q. For a body floating in water, the apparent weight is equal to -
1) Actual weight of the body
2) Zero
3) Weight of the body minus weight of the liquid
4) Weight of the body plus upward thrust
Q. The ohms law is -
1) R=E/W
2) R=E/I
3) R=E/Z
4) None of these
Q. Good conductor of electricity is
1) Copper
2) Silver
3) Aluminum
4) Iron
Q. If signal distorts on increasing the volume, where is the fault?
1) AGC
2) Loud Speaker
3) Volume control
4) Audio stage
Q. In a broadcast receiver, most of the selectivity is achieved in -
1) 1 F stage
2) R F stage
3) Audio stage
4) None of these
Q. In a zener diode regulator, zener -
1) Is kept reverse biased
2) Is kept forward biased
3) Depends upon current requireemnt
4) Depends upon rated voltage
