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Physics Questions Answers
Concave mirror is used in headlights of vehicles, because it—
focuses light from the bulb onto nearby vehicles
sends parallel rays
fits well into the shape of the headlight
is cheaper than other mirrors
sends parallel rays
If some object is weighed when submerged in water, what will happen to its weight compared to its weight in air?
Increase
Decrease
Remain exactly the same
Increase or decrease cannot be predicted
Decrease
The symbol of SI unit of inductance is H. It stands for—
Holm
Halogen
Henry
Hertz
Henry
The henry (abbreviated as H) is the SI unit for electrical inductance. When a current of 1 ampere passes through a coil, resulting in a flux linkage of 1 weber turn, the self-inductance of that coil is 1 henry.
Electron emission from a metallic surface by application of light is known as—
Thermionic emission
Photoelectric emission
High field emission
Autoelectronic emission
Photoelectric emission
Radioactivity is measured by—
G.M. Counter
Polarimeter
Calorimeter
Colorimeter
G.M. Counter
Radioactivity is the properly exhibited by the radioactive isotopes of stable elements and can be either natural or induced. Radioactivity is measured by GM counter.
The mirrors used as rear-view mirrors in vehicles are—
concave
convex
cylindrical
plane
concave
Which one of the following waves is used for detecting forgery in currency notes?
Ultraviolet waves
Infrared waves
Radio waves
Microwaves
Ultraviolet waves
The instrument used in 'lie' detecting is—
Pyrometer
Seismograph
Polygraph
Phonograph
Polygraph
The apparent weight of a man in a lift is less than the real weight when —
the lift is going up with uniform speed
the lift is going up with an acceleration
the lift is going down with uniform speed
the lift is going down with an acceleration
the lift is going down with an acceleration
The green color seen in firework displays is due to the chloride salt of —
Sodium
Barium
Strontium
Calcium
Barium