Electricity — Science STD 10 — Question

Electricity flows through a very long solenoid. Some statements are given below related to the magnitude of the magnetic field developed inside the coil. Find out the correct ones and write them down:

Which of the following is ultimately not derived from the sun's energy (or solar energy)?

1. Wind energy.
2. Nuclear energy.
3. Biomass energy.
4. Ocean thermal energy.

There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:

1. More of carbon but less of hydrogen.
2. Less of carbon but more of hydrogen.
3. Equal proportions of carbon and hydrogen.
4. Less of carbon as well as less of hydrogen.

Circuit Breaker Device which can be used in place of fuse in domestic electric wiring is called:

In order to obtain a magnification of −2 (minus 2) with a concave mirror, the object should be placed:

Study the following diagram and select the correct statement about the device 'X':

When an object is kept at any distance in front of a concave lens, the image formed is always:

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

A teacher sets up the stand carrying a convex lens of focal length 15cm at 42.7cm mark on the optical bench. He asks four students A, B, C and D to suggest the position of screen on the optical bench so that a distinct image of a distant tree is obtained almost immediately on it. The positions suggested by the students were as:

1. 12.7cm.
2. 29.7cm.
3. 57.7cm.
4. 72.7cm.

The correct position of the screen was suggested by.