Q1) Fill in the blanks
1.TMC means_____cubic feet
2._______is used for determining the standard meter
3._______is a unit of acceleration
4. In CGS system the unit of work is____.
Q2) Write if the following statements are True or False
1. Lightning is not seen everyday during the raining season_____
2. A chemical reaction occurs between hydrogen and oxygen in the air which comes down to the earth thus improving the fertility of soil____
3. The ozone gas protects us from the infra rays from the sun.____
Q3) Answer in one or two sentences
1. What is frictional electricity?
2. Differentiate between speed and velocity
3. Why would the weight of an object be maximum at poles and minimum at the equator?
Answers
Q3.
1. Frictional electricity is the electricity produced by rubbing two suitable bodies and the transfer of electrons from one body to other. The body which loses the electrons becomes positively charged while the body which receives the electrons, becomes negatively charged.
2. Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
3. Why would the weight of an object be maximum at the poles and minimum àt the equator. Assertion : The difference in g at the poles and the equator of the earth is directly proportional to the square of its angular velocity. Reason : The value of g is minimum at the equator and maximum at poles.