Question

Class 8th Science
Time: 75 Min
1. FILL IN THE BLANKS:
1. Bakelite is _
of heat and electricity.
2. In India, oil was first stuck in _
in Assam in 1867.
3. Unit of calorific value is _
4.
_ is the cause of desertification.
5. Increased concentration of carbon dioxide in atmosphere is the cause of _
6. The friction always _
the direction of motion.
7. The number of vibration per second is called _
8. The power of an earthquake is expressed on a scale called _
9. Increasing levels of _
like CO2 are leading to global warning.
10.
_ is the substances which contaminate the pure substances.
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Answer 1

Answer:

The number of vibration per second

Explanation: