Movements of tides are mostly determined by

• albedo effect

• wind velocity

• rotation of the Earth

• revolution of the Earth

Fahrenheit and Celsius are the two scales used for measuring temperature. If the numerical value of a temperature recorded in both the scales is found to be same, what is the temperature?

• - 40°

• + 40°

• + 72°

• - 72°

Turpentine oil in paints is used as a

• pigment

• film-forming material

• thinner

• drier

Which of the following groups of plants can be used as indicators of SO₂ pollution of air?

• Ferns

• Mentha

• Lichens

• Hornworts

The burning sensation of a beesting can be stopped by rubbing the affected area with soap. This is because

• a beesting is acidic and soap, an alkali, neutralizes it

• a beesting is alkaline and soap, an acid, neutralizes it

• soap cleans the affected area and removes the sting

• soap acts as an anesthetic and dulls the sensation

Heat given to a body which raises its temperature by 1° C is known as

• water equivalent

• thermal capacity

• specific heat

• temperature gradient

Kerosene oil rises in a wick of lantern because of

• buoyancy of air

• diffusion of the oil through the wick

• capillary action in the wick

• gravitational pull of the wick

38.

The pH of fresh milk is 6. When it turns sour, the pH

• becomes < 6

• remains the same, i.e., 6

• becomes > 6

• becomes neutral, i.e., 7

Magnetic Resonance Imaging (MRD) is used in medical diagnosis to obtain images of our internal body organs. This is primarily possible because

• our body possesses a permanent magnet

• MRI uses an external magnet to generate a magnetic field in our body

• MRI uses an external electric field to generate magnetic field in our body

• ions motion along our nerve cells generates magnetic fields

Which of the following statements in connection with the properties of water is/are correct?

1. Water has higher specific heat in comparison with other liquid.
2. Water has no dipole moment.
3. Water has low heat of vaporization.

Select the correct answer using the code given below.

• 1 only

• 2 and 3

• 1 and 3

• 3 only