PART - 1 CH - 1 Units and Measurements — Physics STD 11 Science — Question

The increase in the speed of a car is proportional to the additional petrol put into the engine. Is it possible to accelerate a car without putting more petrol or less petrol into the engine?

This model of the atmosphere works for relatively small distances. Identify the underlying assumption that limits the model.

A ball is thrown in horizontal direction from the top of a tower and another ball is dropped from the top of same tower. What will be the time difference between both the balls to reach the earth?

What is Bulk modulus for a perfectly rigid body?

When the simple pendulum experiment is performed on Mount Abu the acceleration due to gravity reduce by 1%, what should be the change in the pendulum length to get the correct time from the pendulum clock?

Why do we prefer mercury in a barometer?

Why is sound heard in water more intense in comparison to sound heard in air?

What do you understand by thermal expansion?

When the size of a soap bubble is increased by pushing more air in it, the surface area increases. Does it mean that the average separation between the surface molecules is increased?

If we hold a card below a reel of thread and blow strongly over the hole of the reel, then leaving the card, the card does not fall down, why?