Free Power MCQs with Answers

• A. 45 Js-1
• B. 35 Js-1
• C. 25 Js-1
• D. 195 Js-1

Explanation: The instantaneous power applied to a particle can be calculated using the formula:Power = Force · VelocityGiven that the velocity of the…

• A. 1 sec
• B. 4 sec
• C. 8 sec
• D. 10 sec

Explanation: As P=W/t , Therefore,t=W/PUsing valuest= 20/20t= 1 secSo, this option is right.

• A. 3 times
• B. 9 times
• C. 27 times
• D. 81 times

Explanation: Option A is correct.We know thatPower is given byP,=mgh/tPis directly proportional to m (For same height and time)P,=3mgh/t=3P (m,=3m)

• A. 7.2 kJ
• B. 720 J
• C. 120 J
• D. 72000 J

Explanation: P = 60W t = 2 minutes =2×60 seconds =120 seconds E= P×twhere ( E ) is the energy in joules (J), ( P ) is the power in watts (W), and ( t )…

• A. Man has more power than child
• B. Both have same power
• C. Child has more power than man
• D. It is a foolish question

Explanation: Wman = mgh = (40)(10)(1) = 400 JP = Wman / t = 400 / 10 = 40 wattWchild = mgh = (10)(10)(1) = 100 JP = Wchild / t = 100 / 1 = 100 watt

• A. 5 W
• B. 40 W
• C. 60 W
• D. 500 W

Explanation: The power of a machine is calculated using the formula: Power = Work / Time.

• A. 200 W.
• B. 800 W.
• C. 4000 W.
• D. 8000 W.

Explanation: To calculate the power of the motor, you need to find the work done and then divide it by the time.

• A. 40 J.
• B. 90 J.
• C. 2400 J.
• D. 144000 J.

Explanation: Energy (E) = Power (P) × Time (t)Given:Power (P) = 40 WTime (t) = 1 hourFirst, convert the time from hours to seconds, as 1 Watt is equal…

• A. 10 W
• B. 15 W
• C. 20 W
• D. 25 W

Explanation: This is correct because power = work ÷ time = 300 ÷ 20 = 15 W.

• A. Joule
• B. Newton
• C. Watt
• D. Pascal

Explanation: This is correct because watt (W) is defined as 1 joule per second, the SI unit for power.

• A. 0.33 litre of petrol
• B. 1 litre of petrol
• C. 0.5 litre of petrol
• D. 2 litre of petrol

Explanation: The food we eat in one day has about the same energy as 0.33 litre of petrol.

• A. Kinetic energy
• B. Potential energy
• C. Power
• D. Work done

Explanation: The product of force and velocity is called power.

• A. 476 watts
• B. 647 waits
• C. 746 watts
• D. 467 watts

Explanation: One mechanical horsepower of 550 foot-pounds per second is equivalent to 745.7 watts.

• A. Kinetic energy
• B. Potential energy
• C. Power
• D. Work done

Explanation: The product of force and velocity is power.

• A. 1500 w
• B. 742 w
• C. 148 w
• D. 1492 w

Explanation: A fully loaded 2 HP motor at 100% efficiency consumes 2 x 0.746 = 1.492 kW per hour.

• A. Current
• B. Volt
• C. Resistance
• D. Power

Explanation: Volt multiplied by Ampere equals Watt, which is the unit of power.

• A. Force and displacement
• B. Force and velocity
• C. Force and time
• D. Work and time

Explanation: Power (P) is calculated as the dot product of force (F) and velocity (v), which represents the rate at which work is done.

• A. 1000 watt
• B. 100 watt
• C. 10 watt
• D. 0.10 watt

Explanation: Power is the amount of energy transferred or converted per unit time.Power = energy / timeGiven that,Work done = 100JTime taken= 10sPower…

• A. 20 J
• B. 120 J
• C. 30 J
• D. 0.02 J

Explanation: The energy consumed by a 60-watt bulb in 2 seconds can be calculated using the power formula: P = E/t.

• A. VI
• B. I2R
• C. V2/R
• D. All of the above

Explanation: The correct answer is D, 'All of the above', because each option provides a valid formula for calculating power in an electrical circuit.