physics

If a wire 30cm long is extended to 30.5cm by a force of 300N. Find the strain energy of wire?

A. 0.75 J B. 7.50 J C. 75.00 J D. 750.00 J Correct Answer: Option A - 0.75 J Explanation…

5 years ago

A machine of velocity ratio 6 requires an effort of 400N to raise a load of 800N through Im. Find the efficiency of the machine

A. 55. 6 % B. 50.0% C. 33.3% D. 22.2% Correct Answer: Option C = 33.3% Explanation Efficiency = (MA)/V.R…

5 years ago

The surfaces of conveyor belts are made rough so as to?

A. protect them while carrying loads B. prevent the loads from slipping C. enable them to carry more load D.…

5 years ago

A car moves with an initial velocity of 25ms−¹ and reaches a velocity of 45ms−¹ in 10s. What is the acceleration of the car?

A. 2 ms-2 B. 5 ms-2 C. 20 ms-2 D. 25 ms-2 Correct Answer: Option A = 2 ms-2 Explanation…

5 years ago

A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance; which of the following is correct?

A. the feather will be brown away by the wind while stone will drop steadily B. the stone and the…

5 years ago

Two cars moving in the same direction have speeds of 100 kmh−¹ and 130 kmh−¹. What is the velocity of the faster car as measured by an observer in the slower car?

A. 30 kmh−¹ B. 130 kmh−¹ C. 200 kmh−¹ D. 230 kmh−¹ Correct Answer: Option A - 30 kmh−¹ Explanation…

5 years ago

Two resistors 5Ω and 10Ω are arranged first in series and later in parallel to a 24V source; the ratio of total power dissipated in the series and parallel arrangements respectively is?

A. 5:3 B. 1:50 C. 50:1 D. 3:5 E. No Correct Option Correct Answer: Option E - No Correct Option

5 years ago

In an A.C circuit, the ratio of r.m.s value to peak value of current is?

A. 2 B. ½ C. 1/√2 D. √2 Correct Answer: Option C = 1/√2

5 years ago

In Homes; electrical appliances and lamps are connected in parallel because?

A. Parallel connections do not heat up the wires B. series connections use high voltage C. less current will be…

5 years ago

If the volume of a gas increases steadily as the temperature decreases at constant pressure; the gas obeys?

A. Graham's Law B. Boyle's Law C. Pressure law D. Charles Law E. No Correct Option Correct Answer: Option E…

5 years ago
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