PHYSICS SS1

Which of the following is the unit of the moment?

• N.m

• Newton

• Meter

• m/s

A steel needle floating on water sinks when kerosene is added to the water. This is because the kerosene

• increases the surface tension of the water

• reduces the density of water

• reduces the surface tension of the water

• reduces the upthrust on the needle

The mass of the object is 1500 g. Find the weight of the object on the earth? (g = 10N/kg)

• 150N

• 1500N

• 15000N

• 15N

The action of water rising up the stem of a plant due to

• Surface tension

• Osmosis

• Transpiration

• Capillarity

In the diagram, V is viscosity and U is up-thrust. Which of the following equations holds when the falling body P has attained a terminal velocity?

• V + mg = U

• V + U - mg = 0

• V = mg/U

• V - U = mg

In the diagram, a rod 50cm long of the uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

• 200N

• 120N

• 80N

• 40N

The apparent weight of a body wholly immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body (Density of water=1000kg/m^-3, g=10ms^-2)

• 8.9 X 10^-3m³

• 6.4 X 10^-3m³

• 3.2 X 10^-3m³

• 3.0 X 10^-3m³

Which of the following statements about the mass and the weight of a body is not correct? Its

• mass is a scalar quantity

• weight is a function of the gravitational pull on it

• mass on earth and on the moon is the same

• weight is a scalar quantity

An object weighs 50N in air and 30N in water. Calculate the upthrust of liquid on the solid

• 20 N

• 25 N

• 50 N

• 80 N

An empty relative density bottle weighs 15g, it weighs 55g when filled with a liquid and 95g when filled with water. Find the relative density of the liquid (Density of water is 1g/cm³)

• 0.5

• 1.4

• 2.3

• 3.0