Force — Physics STD 10 — Question

Fill in the following blank using suitable word:
SI unit of heat is .........

SONAR is a technique used to __________ [determine the size of blue whale/detect the impurities present in sea water/detect the depth of sea bed].

The _________ [systematic/ series/ parallel] wiring system in houses is preferred.

Mechanical advantage of single movable pulley is ________ [one/two/three].

When light travels from a rarer to a denser medium, its speed ___________ [increases/decreases/does not change].

The efficiency of an a.c. generator is ___________ [lower than / higher than / equal to] that of a d.c generator.

The refracted ray is __________ [parallel/ perpendicular/ collinear] to the base of the prism in minimum deviation position.

The mass number (A) of an element is not changed when it emits ______________.

A ray of light bends _________ [away/near/interset] while travelling from optically denser medium to rarer.

Unit of electrical energy consumed if power is expressed in watt is ________ [watt hour/jule second/watt].