The device for tracking and locating the position of a moving object in space is called
Space ship
Lunar module
Radar
Rocket
Correct Answer :
C. Radar
Related Questions
Meteors
look like falling stars
are really pieces of rock or metal
burn up as they shoot through the air
All the above
The resistance of a wire depends on
the material of the wire
the length of the wire
the cross section of the wire
All the above
When an incident beam of light strikes the surface of a glass slab normally, the refracted beam
goes straight through without bending
gets deviated away from the normal
gets bent towards the normal
gets reflected
A car parked in the sun with its windows closed gets terribly hot inside. This is due to
the heat emitted by the engine
the greenhouse effect
the good conducting power of the metal body
the double layered wind shield
The radiator in a car serves to
cool the engine
heat up the engine
start the car
moderate the speed
When we sweat, we feel comfortable under a fan because
the air circulated by the fan is cool
the fan produces convection currents of air
the air circulated by the fan quickens the evaporation of the moisture on our skin
the air takes away the heat from our body
On the Kelvin scale, the melting point of ice is
0 K
273 K
373 K
100 K
A man Jumping out of a moving train is thrown
forward
backward
sideways
None of the above
The mode of travel of heat energy from the sun across the empty space beyond the earth's atmosphere is known as
conduction
convection
radiation
absorption
In compact porous soil, the rising of the water is due to
capillarity
cohesion
adhesion
viscosity
A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle
at the lower elevation than the bird
at a higher elevation than the bird
in the same direction as the bird
vertically upwards
The scientist who first sent electromagnetic waves to distant places was
James Clerk Maxwell
Heinrich Hertz
Thomas Alva Edison
Baird
A series of east moving still pictures can be made to appear as a moving picture because the eye
can focus very rapidly as pictures change
is quicker than the brain
can see two images separated only if the interval' between seeing them is more than' one-tenth of a second
can shut out some of the light
In the electrical circuit of a house the fuse acts as
a thermopile
a load
a step down device
a safety device
On applying a constant force to a mass, It moves with a uniform
velocity
momentum
acceleration
angular velocity
Stars twinkle because of
refraction of light from them through air
reflection
absorption
All the above
At temperature near OK, (zero kelvin) metals such as lead and tin become
insulators
semiconductors
superconductors
condenser
A hydrogen bomb is based on
nuclear fusion
nuclear fission
Both (a) and (b) above
Neither (a) nor (b)
Out of the following which element has the longest half-life period?
Radium
Radon
Uranium-238
Plutonium
When sound waves travel from one medium to another, the quantity which remains unchanged is its
speed
frequency
wavelength
All the above
At what temperature do the Fahrenheit and Celsius scales give the same reading?
212°
32°
-40°
0°
A thermostat is a device used
for automatically maintaining a steady temperature
for measuring electricity
to reduce the voltage of electricity
for producing heat
When the velocity of a body is halved
its momentum is halved
its kinetic energy is halved
its acceleration is halved
its potential energy is halved
A spherical mirror is
a reflecting elliptical portion
a reflecting spherical surface
a parabolic reflecting surface
a flat reflecting surface
When are temperature resistance
increases
decreases
remains the same
first increases then decreases
A piece of cork la embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?
It will go down
It will come up
It will remain at the same level
First it will go down and it will come up
Mercury is used in a barometer because
its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
at the ordinary temperature its vapour pressure is small
it is opaque and does not wet glass
All the above
The maximum displacement of the particle in a mechanical wave motion is known as
amplitude
vibration
frequency
phase
When a body Is taken to the poles from the equator, Its weight becomes
greater
less
the same
None of these
Which force is used when milk is churned to separate cream?
cohesive
centrifugal
frictional
gravitational