Thermodynamics — Physics STD 11 Science — Question

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?

Define impulse and tell its unit

The length of the string of a simple pendulum is measured with a metre scale to be 90.0cm. The radius of the bob plus the length of the hook is calculated to be 2.13cm using measurements with a slide callipers. What is the effective length of the pendulum? (The effective length is defined as the distance between the point of suspension and the centre of the bob.)

Is it possible to convert water into vapour form without increasing its temperature, if temperature and pressure of water are 30°C and 1 atm respectively?

If it were possible for a gas in a container to reach the temperature 0K, its pressure would be zero. Would the molecules not collide with the walls? Would they not transfer momentum to the walls?

Which of the following methods can be used to measure the speed of light in laboratory?

1. Roemer method.
2. Fizeau method.
3. Focault method.
4. Michelson method.

A man and a child weighed are holding a weight in 2 kg their respective palms. On whose palm will there be more pressure?

Which of the following symptoms is likely to afflict an astronaut in space (a) swollen feet, (b) swollen face, (c) headache, (d) orientational problem.

What is the number of degree of freedom of a bee flying in a room?

What is the effect of gravity on pressure?