Thermodynamics — Physics STD 11 Science — Question

Why is the dome of water reservoir thick at the bottom?

Give the name of three important characteristics of a SHM.

A glass of water has an ice cube floating in water. The water level just touches the rim of the glass. will the water overflow when the ice melts? 

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?

A wire increases by 10^-3 of its length when a stress of 10⁸Nm^-2 is applied to it. What is the Young's modulus of the material of the wire?

A body of mass 2kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1. Compute the:
Work done by the applied force in 10s.

There is a hole in a metal disc. If a metal disc is heated, what will happen to the size of the hole?

Three stars A, B, C appear as green, red and blue respectively. Which star has minimum temperature?

An object is placed far away from all the objects that can exert force on it. A frame of reference is constructed by taking the origin and axes fixed in this object. Will the frame be necessarily inertial?

A photographic plate is placed directly in front of a small diffused source in the shape of a circular disc. It takes 12s to get a good exposure. If the source is rotated by 60° about one of its diameters, the time needed to getthe same exposure will be:

1. 6s
2. 12s
3. 24s
4. 48s.