electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

Question : 26

If a body is charged by rubbing it, its weight

a) increases slightly

b) decreases slightly

c) remains precisely constant

d) may increase slightly or may decrease slightly

Question : 27 [UPPCS (Pre) 2017]

Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be

a) Ten units

b) One unit

c) Two units

d) Twenty units

Question : 28 [UP (Mains) 2015]

Small drops of the same size are charged to V volts each. If n such drops coalesce to form a single large drop, its potential will be

a) nV

b) $n^{2/3}$V

c) $n^{1/3}$V

d) $n^{–1}$V

Question : 29 [NDA]

Two pieces of metallic wire having equal lengths and equal volume placed in air have different resistances. The two wires must

a) be of different materials

b) have different cross-sections

c) have different temperatures

d) be of same density

Question : 30 [PSC (Pre) 2018]

The temperature of the filament of lighted electric bulb is generally

a) 2000°C to 2500°C

b) 100°C to 500°C

c) 1000°C to 1500°C

d) 3000°C to 3500°C