physics

In an ac circuit when the supply voltage frequency is equal to the resonant frequency, the current?

A. leads the supply voltage by 90º B. lags behind the supply voltage by 90º C. leads the supply voltage…

6 years ago

The region around a magnet in which magnetic force can be expressed is known as?

A. declination B. flux density C. field D. flux Correct Answer: Option C C. field

6 years ago

An ammeter can be adapted to measure the potential differences by using a?

A. shunt B. multiplier C. rheostat D. resistance box Correct Answer: Option B B. multiplier

6 years ago

An object is placed in front of two plane mirrors inclined at 60º to each other. Determine the number of the images formed?

A. 2 B. 3 C. 5 D. 7 Correct Answer: Option C C. 5

6 years ago

an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]

A. 104.4m B. 207.9m C. 415.8m D. 523.8m Correct Answer: Option B B. 207.9m Explanation S = vt/2 =330×1.26/2 =…

6 years ago

A fish inside a pond appears to be at a depth of 1.5m when viewed vertically from above. The refractive index of the water in the pound is 1.3. Calculate the apparent displacement of the fish?

A. 2.50m B. 1.95m C. 1.50m D. 0.45m Correct Answer: Option D D. 0.45m Explanation Real depth = n x…

6 years ago

The diagram below illustrates an electromagnetic wave travelling with speed of 3.0 x 10^8 ms‾¹. Calculate the wavelength of the wave.

A. 0.05m B. 0.15m C. 0.16m D. 0.40m Correct Answer: Option C C. 0.16m

6 years ago

The functional difference between a lens and a mirror is that a lens?

A. reflects a beam of light while a mirror refracts it B. refracts a beam of light while a mirror…

6 years ago

Which of the following relations about the focal length fo of the objective and focal length fe of the eyepiece of a compound is correct?

A. fo = fe B. fo < fe C. fo > fe D. fe = 2fo Correct Answer: Option B…

6 years ago

Refraction of lights differs from reflection in that, in refraction

i. at least two media are involved ii. there is a change in the direction of the ray iii. the…

6 years ago
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