Magnetic Effects of Electric Current — Science STD 10 — Question

Which of the following characteristic is not suitable for a fuse wire?

An electric generator converts:

1. Electrical energy into mechanical energy.
2. Mechanical energy into heat energy.
3. Electrical energy into chemical energy.
4. Mechanical energy into electrical energy.

A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti-clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to:

Due to which phenomena the combination of red, green and blue forms the same white colour:

If an object is placed 21cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19cm from the lens, the image formed is slightly larger than object. The approximate focal length of the lens is:

Motion pictures or cinematography make use of:

Two resistors of resistance 2Ω and 4Ω when connected to a battery will have:

The shape of the earth's magnetic field resembles that of an imaginary:

1. U-shaped magnet.
2. Straight conductor carrying current.
3. Current-carrying circular coil.
4. Bar magnet.

Having two eyes gives a person:

1. Deeper field of view.
2. Coloured field of view.
3. Rear field of view.
4. Wider field of view.

A real image is formed by the light rays after reflection or refraction when they :
A. actually meet or intersect with each other.
B. actually converge at a point.
C. appear to meet when they are produced in the backward direction.
D. appear to diverge from a point.
Which of the above statements are correct?