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Physics

Physics
If a person moves a trolley for a distance of 10 m with a force of 50 N, then the work done is

500 J
0.2 J
5 J
20 J

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Physics
An oil drop spreads over water because

water has a higher surface tension
Oil is lighter than water
Oil does not mix with water
Oil is more viscous

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Physics
The hydraulic brakes used in automobiles is a direct application of :

Pascal's law
Bernoulli's theorem
Toricellian law
Archimedes' principle

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Physics
According to the quantum theory of light, the energy of light is carried in discrete units are called

Electrons
Protons
Photoelectrons
Photons

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Physics
The centre of gravity of a sprinter during the race lies

Behind his feet
At the centre of the body
Ahead of his feet
To the left side of the body

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Physics
A circular plate, a cube and a sphere, all made up of same material and having the samemass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?

Cube
Sphere
All will cool at the same rate
Circular plate

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