Nageen Prakashan Physics Class 11. We covered all the Nageen Prakashan Physics Class 11 MCQs in this post for free so that you can practice well for the exam.
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Nageen Prakashan Physics Class 11 Objective for Students
The connecting cable of electrical appliances like electric irons, water heaters, or room heaters contains three insulated copper wires of three different colors – red, green, and black. Which one of the following is the correct color code?
(a) Red-live wire, Green-neutral wire, Black-ground wire
(b) Red-neutral wire, Green-ground wire, Black-live wire
(c) Red-live wire, Green-ground wire, Black-neutral wire
(d) Red-ground wire, Green-live wire, Black-neutral wire
Option c – Red-live wire, Green-ground wire, Black-neutral wire
Sound waves cannot travel through a
(a) copper wire placed in the air
(b) silver slab placed in the air
(c) glass prism placed in water
(d) wooden hollow pipe placed in a vacuum
Option d – wooden hollow pipe placed in a vacuum
The frequency of ultrasound waves is:
(a) less than 20 Hz
(b) between 20 Hz and 2 kHz
(c) between 2 kHz and 20 kHz
(d) greater than 20 kHz
Option d – greater than 20 kHz
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