Physics Quiz

The rigidity of a rotating gyroscope can be increased by:

• increasing the diameter whilst reducing the rotational speed

• reducing the friction within the gyroscope

• increasing the rotational speed or mass or both

The clamping force holding a block of weight 20 N onto a surface inclined at 30 degrees to the horizontal is:

• 20 Cos 30 N

• 20 Tan 30 N

• 20 Sin 30 N

An object of mass 8 Kg is moving and has a momentum of 56 Kg m/s. Its velocity is:

• 440 m/s

• 14 m/s

• 7 m/s

A mass of 20 Kg is moved at a constant speed over a horizontal surface with a coefficient of friction of 0.3 between the mass and the surface. Assuming "g" is 10 m/s^2 , the frictional force will be:

• 60 N

• 6 N

• 150 N

A cylinder of total volume 800 cc floats in a liquid with half it's volume submerged If the same cylinder floats in water such that 600 cc of it's volume is submerged, what is the relative density of the first liquid?

• 1.5

• 0.75

• 0.5

If a cube of wood of side length 1m floats with half its volume submerged in water in water which has a density of 1000 kg/m3 then the mass of the wooden block is:

• 1000 kg

• 500 kg

• 250 kg

The Specific Gravity of a fuel is 0.9, 4 litres of fuel would weigh:

• 3.6 Kg

• 36 Kg

• 4.4 Kg

If a gas in a sealed container is cooled, then its:

• pressure rises

• mass reduces

• pressure decreases

What effect does temperature have on the viscosity of a liquid?

• It becomes more viscous

• It becomes less viscous

• Temperature does not affect viscosity

Bernoulli's theorem states that:

• pressure acts equally in all directions

• pressure always acts equally horizontally to a surface

• the total energy in a system is constant