All the following statements are correct, except _____.

1. 1. The presences of moisture in the air reduces the conductivity of charge
   2. A body is said to be negatively charged when it has got some electrons
   3. When a body is charged positively, some electrons escape from it
   4. Noe of the above statements is correct

Condenser is used _____.

1. 1. To change the direction of current
   2. To collect the charge
   3. to produce charge
   4. As a good conductor of electricity

Which of the following is true for capacitors in series?

1. 1. The total charge is the sum of the charges on each capacitor
   2. The total capacitance is the sum of the individual capacitance
   3. The total voltage is the sum of the voltage across each capacitor
   4. The available charge is shared between two or more capacitors

The needle of a magnetic compass _____.

1. 1. Aligns itself parallel to a magnetic field
   2. Is affected only by permanent magnetics
   3. Aligns itself perpendicular to a magnetic field
   4. Rotates in the magnetic field of an electric current

The working of optical fibers is based on the _____ of electromagnetic waves.

1. 1. Polarization
   2. Reflection
   3. Refraction
   4. Total internal reflection

It takes much longer to cook things in the hills than in the than in the plains, because_____.

1. 1. Due to low atmospheric pressure in the hills the boiling point of water is raised and therefore, water takes longer to boil
   2. The humid atmosphere in the hills absorbs a lot of heat, leaving very little for the cooking
   3. Atmospheric pressure is high in the hills and water boils at a higher temperature
   4. Atmospheric pressure is lower and water boils at a lower temperature

What makes the air coming out of a punctured tyre cool?

1. 1. Isothermal expansion
   2. Flow at thigh speed
   3. Adiabatic expansion
   4. None of the above

The flow of heat from a hot to a cold body is an example of _____.

1. 1. Irreversible process
   2. Reversible process
   3. Adiabatic process
   4. Isothermal process

The weight of a given object is maximum _____.

1. 1. At the surface of the earth
   2. At the top of a mountain 5,000 ft high
   3. At the bottom of a 500 ft. deep mine
   4. At a distance of 100 km above the earth’s surface

The phenomenon of land and sea breeze is as a result of _____.

1. 1. Radiation
   2. Convection
   3. Conduction
   4. None of thses