physics

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm. What is the object distance?

A. 10 cm B. 25 cm C. 16 cm D. 14 cm Correct Answer: Option A = 10 cm Explanation…

5 years ago

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

A. X is the anode and very high current is used B. X is the anode and Y is the…

5 years ago

If the threshold frequency for tungsten is 1.3 x 10^15Hz; what is its work function [H = 6.6 x 10^-34 Js]?

A. 8.58 x 10-19 J B. 8.50 x 10-15 J C. 8.58 x 10-17 J D. 8.85 x 10-18 J…

5 years ago

The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as?

A. saturation B. bonding C. amplification D. dopping Correct Answer: Option D - dopping

5 years ago

A radioactive isotope has a decay constant of 10^-5s^4. Calculate half-life.

A. 6.93 x 105s B. 6.93 x 105s C. 6.93 x 104s D. 6.93 x 104s Correct Answer: Option C…

5 years ago

Which of the following materials has an increase in resistance with temperature?

A. water B. metals C. wood D. electrolyte Correct Answer: Option B - metals Explanation Resistance in metals are proportional…

5 years ago

Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

A. 600 J B. 50 J C. 133 J D. 250 J Correct Answer: Option A - 600 J Explanation…

5 years ago

Under which of the following conditions do gases conduct electricity?

A. Low pressure and low p.d B. low pressure and high p.d C. high pressure a low p.d D. high…

5 years ago

If the charge of electricity is Kwh is N4; what is the cost of operating an electrical appliance rated 250V; 2A for six hours?

A. N28 B. N12 C. N16 D. N24 Correct Answer: Option B - N12 Explanation Energy consumed = power x…

5 years ago

When a red rose flower is observed in blue light. What colour does the observer see?

A. Red B. Blue C. Magenta D. yellow E. No correct option Correct Answer: Option E - No correct option…

5 years ago
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