CBSE Class X – Science Physics Exam (Full Syllabus)

Soft iron inside the current carrying solenoid act as an electromagnet.

A device that reverses the direction of current in the arms of armature through a circuit is called commutation.

All are the causes to occur overloading

Ammeter is a device used for measuring electric current in amperes

In parallel combination, the equivalent resistance is smaller than the least resistance used in the circuit.

Total power used, P = P1 + P1 = 1500 + 500 = 2000 W.Current drawn from the supply,

Ammeter at the times connected in series with in the circuit. The reading is independent from its location.

The gap between conduction band and valence band is much greater than conductors which don't allow them to conduct electricity very easily which in result shows greater resistance, so insulators offer infinitely high resistance.

repulsion is noticed only when two bodies have like charges and this means that the bodies must be charged. Hence, repulsion is a true test of electrification

one horse power is determined as almost 746 Watt in standard calculations. It derived its name from the following context: One horsepower is the amount of power used by a horse to lift a 550 pounds heavy object from a depth of 1 foot in one second. This power when converted to SI system gives 746 Watts.

Copper wire cannot be used as a fuse wire since melting point of Cu is higher and resistance is very low and current can flow through it without melting it and without breaking the circuit resulting in appliance damage

The bluish colour of water in deep sea is due to scattering of light. The fne particles in water scatter mainly blue light having shortest wavelength.

The total variation in intensity of light entering our eyes from each of these point sources average out to zero, thereby nullifying the twinkling effect