A gas would serve as an electrical conductor under?

5 years ago

A. reduced pressure and high current B. increased magnetic field C. reduced pressure and reduced potential D. exposure to visible…

In a pure semiconductor; the number of electrons in the conduction band is?

5 years ago

A. less than the number of holes in the valence band B. equal to the number of holes in the…

What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?

5 years ago

A. Compound microscope B. Galileo's telescope C. Terrestrial telescope D. Astronomical telescope Correct Answer: Option D - Astronomical telescope

A cell of internal resistance 0.01Ω can be measured accurately using the?

5 years ago

A. Ohm meter B. metre bridge C. potentiometer D. electroscope Correct Answer: Option C - potentiometer

A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?

5 years ago

A. 0.3m B. 3.0m C. 3.5m D. 4.0m Correct Answer: Option B - 3.0m Explanation V = 72m U =…

If a charged ion goes through combined electric and magnetic fields; the resultant emergent velocity of the ion is?

5 years ago

A. E/B B. EB C. B/E D. E - B Correct Answer: Option A = E/B

A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If two of the cells are wrongly connected, the net e.m.f. of the radio is?

5 years ago

A. 8V B. 10V C. 12V D. 16V Correct Answer: Option C = 12V Explanation Net e.m.f = (8 x…

The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by?

5 years ago

A. convection B. conduction C. radiation D. evaporation Correct Answer: Option A - convection

One end of a long wire is fixed while a vibrator is attached to the other end. When the vibrator is energized, the types of waves generated in the wire are?

5 years ago

A. stationary and longitudinal B. stationary and transverse C. progressive and transverse D. progressive and longitudinal Correct Answer: Option A…

A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called?

5 years ago

A. condensation B. sublimation C. regelation D. fusion Correct Answer: Option C - regelation

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