Q.31)-Which of the following liquid is most viscous?
- Oil
- Milk
- Water
- Petrol
Q.32)-The surface tension of water on adding detergent to it
- Increase
- Decreases
- No change
- Become zero
Q.33)-Rise of oil in a wick is due to
- Density of the oil
- Viscosity of the oil
- Surface tension of the oil
- Pressure of the oil
Q.34)-If an ordinary glass tube and a glass capillary tube are both dipped in a beaker of water rises in
- Both
- Only the glass tube
- Only the capillary tube
- Radiation
Q.35)-two rods, one of copper and other of steel, experience the same upthrust when placed in water. Thus both have
- Equal volume
- Equal weight
- Equal density
- Equal mass
Q.36)-A single fixed pulley is used to draw water from a well because
- Efficiency is 100%
- Velocity ratio is low
- Mechanical advantages is high
- Force is applied in a convenient direction
Q.37)-Ball pen functions on the principle of
- Viscosity
- Boyle's law
- Gravitional force
- Surface tension
Q.38)-Water from soil enters into the root hairs owing to
- Atmospheric pressure
- Capillary pressure
- Root pressure
- Osmatic pressure
Q.39)-Water drops cannot stick to the oily surface due to
- Lack of adhesive force
- Surface tension
- Cannot mix each other
- Water is lighter than oil
Q.40)-If cream is removed from milk, its density
- Increases
- Decreases
- Remains the same
- May increase or decrease