Blog - Page 1690 of 5479 - Erudites Academy

A gas would serve as an electrical conductor under?

A. reduced pressure and high current B. increased magnetic field C. reduced pressure and reduced potential D. exposure to visible light Correct Answer: Option A – reduced pressure and high current Explanation In general, gases conduct electricity under reduced...

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

by Sunday | Nov 16 | Physics JAMB

A. less than the number of holes in the valence band B. equal to the number of holes in the valence band C. greater than the number of holes in the valence band D. twice the number of holes in the valence band Correct Answer: Option B – equal to the number of...

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

by Sunday | Nov 16 | Physics JAMB

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?

by Sunday | Nov 16 | Physics JAMB

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?

by Sunday | Nov 16 | Physics JAMB

A. 0.3m B. 3.0m C. 3.5m D. 4.0m Correct Answer: Option B – 3.0m Explanation V = 72m U = Magnification = 24 But Magnification = V/U ∴ 24 = 72/U U = 72/24 U = 3.0m

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

by Sunday | Nov 16 | Physics JAMB

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?

by Sunday | Nov 16 | Physics JAMB

A. 8V B. 10V C. 12V D. 16V Correct Answer: Option C = 12V Explanation Net e.m.f = (8 x 2) – (2 x 2) = 12V

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

by Sunday | Nov 16 | Physics JAMB

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?

by Sunday | Nov 16 | Physics JAMB

A. stationary and longitudinal B. stationary and transverse C. progressive and transverse D. progressive and longitudinal Correct Answer: Option A – stationary and longitudinal Explanation The vibrator is fixed at the end of the rope, hence, it is stationary....

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?

by Sunday | Nov 16 | Physics JAMB

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

A gas would serve as an electrical conductor under?

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

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

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

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?

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

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?

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

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?

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?

Recent Posts

Products

Product categories