2101.
Global warming is observed century-scale rise in the …………………. of the Earths climate system.
A
Maximum temperature
B
Minimum temperature
C
Average temperature
D
Temperature
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Global warming is observed century-scale rise in the …………………. of the Earths climate system.
Maximum temperature
Minimum temperature
Average temperature
Temperature
Ocean temperatures increase more slowly than land temperatures because of the larger effective …………………… of the oceans
Heat capacity
Heat balance
Heat transfer
Heat exchanger
Long period of time without water is classified as
flood
drought
desertification
endangering
Increased global temperatures causes the
desertification
destruction of human settlements
destruction of infrastructure
endangering of species
Rise in water level in oceans and seas due to melted ice sheets and glaciers causes
desertification
destruction of human settlements
destruction of infrastructure
endangering of species
Global warming also refers to as
Climate change
Ecological change
Atmosphere change
None of the above
Which of these greenhouse gases is most abundant in the atmosphere?
Carbon dioxide
Methane
Nitrous oxide
Water vapour
Without the Earths atmosphere, the Earths average temperature would be well below the …………………. temperature of water
Boiling
Freezing
Vaporization
None of the above
The El-Nino Phenomenon occurs in
Atlantic Ocean
Pacific Ocean
Indian Ocean
Arctic Ocean
Which of the following statements is not true for a stone attached to a string and swung in a uniform vertical circular motion?
The magnitude of resultant force acting on the stone changes depending on the position of the stone in the circle.
The tension in the string is lowest when the stone is at the highest point of the circular motion.
The kinetic energy of the stone is constant throughout the entire circular motion.
The resultant acceleration is always directed towards the centre of the circle.
Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
The inside horse
The outside horse
Neither—they both have the same linear speed.
When particle revolves with uniform speed on a circular path
no force acts on it
no acceleration acts on it
no work is done by it
its velocity is constant
What is the direction of the force that acts on clothes in the spin cycle of a washing machine?
Inward
Down
Outward
Up
The clock on Big Ben has a minute hand of length 4.3 m and an hour hand of length 2.7 m. What is the ratio of the centripetal acceleration of a point on the tip of the minute hand to a point on the tip of the hour hand?
1.6
150
230
5700
The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is
friction.
his weight.
the normal force.
none of the above
In a vertical circle of radius r at what point in its path, a particle has a tension equal to zero?
Highest point
Lowest point
Any point
A horizontal point
If you whirl a tin can on the end of a string and the string suddenly breaks, the can will
fly directly away from you.
fly off, tangent to its circular path.
fly directly toward you.
spiral in toward your hand.
For a particle performing a U.C.M. the acceleration is
constant in direction
constant in magnitude but not in the direction
constant in magnitude and direction
constant in neither magnitude nor in direction
Earth rotates and revolves through space. Earth rotates about the ............., which is an..............axis. Earth revolves about the................, which is an..............axis.
sun, external, North/South pole, internal
North/South pole, external, sun, internal
sun, internal, North/South pole, external
North/South pole, internal, sun, external
Decreasing the mass of an object on a circular path but keeping its velocity and radius constant
increases the centripetal force on the object
decreases the centripetal force on the object
does not affect the centripetal force on the object
depends on the specific situation