# Physics Questions and Answers updated daily – General Knowledge

Physics Questions: Solved 254 Physics Questions and answers section with explanation for various online exam preparation, various interviews, General Knowledge Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

## Physics Questions

21. A crate of bananas weighing 3000 N is shipped from Ramgarh to Delhi, where it is unloaded by a dock worker who lifts the crate by pulling with a force of 200 N on the rope of a pulley. What is the actual mechanical advantage of the system?

Correct Ans:15N
Explanation:
-----> Mechanical advantage of a pulley = (output/force input)
-----> Force output is 3000N
-----> Force input is 200 N
-----> M.A = (3000/200)
-----> = 15N
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22. Who among the following is the quantity__________________.

Correct Ans:pressure
Explanation:
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
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23. What is the mechanical advantage of a simple machine when a load of 450N can be lifted by force of 50N using a lever?

Correct Ans:9
Explanation:
---> Mechanical advantage of a lever is
---> M.A of a lever = (load/effort)
---> = (450/50) = 9
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24. Troposphere is______

Correct Ans:Lowest level of atmosphere where we survive
Explanation:
Earth's atmosphere can be (called atmospheric stratification) into
five main layers. Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere, mesosphere, and thermosphere. From highest to lowest, the five main layers are: Exosphere: 700 to 10,000 km (440 to 6,200 miles) Thermosphere: 80 to 700 km (50 to 440 miles) Mesosphere: 50 to 80 km (31 to 50 miles) Stratosphere: 12 to 50 km (7 to 31 miles) Troposphere: 0 to 12 km (0 to 7 miles) The troposphere is the lowest major atmospheric layer, extending from the Earth's surface up to the bottom of the stratosphere. The troposphere is where all of Earth's weather occurs. It contains approximately 80% of the total mass of the atmosphere.
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25. A photostat machine works on

Correct Ans:magnetic image making
Explanation:
All Electrostatic Copiers work under the premise that a charge of electricity is place on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography. A dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
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26. In the process of magnetization of a bar

Correct Ans:the entire bulk of the bar gets magnetised
Explanation:
In the process of magnetization of a bar the entire bulk of the bar gets magnetized.
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27. At normal temperature due to a puncture, the compressed air inside the tube of a car wheel suddenly starts coming out. Then the air inside the tube

Correct Ans:Starts becoming cooler
Explanation:
When air is coming out of punctured football, puncture acts like a nozzle. when fluid is passed through nozzle, velocity increases and pressure decreases, resulting in decrease of temperature.
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28. Heat energy of an object is

Correct Ans:The total energy of the molecules of the object
Explanation:
Heat is a form of energy associated with the movement of atoms and molecules in any material. The higher the temperature of a material, the faster the atoms are moving, and hence the greater the amount of energy present as heat.
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29. You decide to launch a ball vertically so that a friend located 45 m above you can catch it. What is the minimum launch speed you can use?

Correct Ans:30 m/s
Explanation:
Initial velocity of the ball, u = 0
Final velocity of the ball, v = ?
Distance covered by ball, ie., displacement, S = 45 m
Acceleration due to gravity, a = 9.8 or 10 m/s2
From the equation of motion:
v2 = u2 + 2as

v2 = (0)2 + 2 * 10 * 45
v2 = 20 * 45
v2 = 900
v = √(900)
v = 30 m/s

Hence, the minimum launch speed we can use = v = 30 m/s.
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30. A sound wave has a frequency of 3.5 kHz and wavelength 0.1 m. How long will it take to travel 700 m?

Correct Ans:2 s
Explanation:
Given: Frequency = 3.5 kHz; Wavelength = 0.1 m; Distance = 700 m

Velocity of the soundwave = Wavelength*Frequency
= 3500*0.1
= 350 m/s
Time takes to travel 700m = Distance/Speed
= 700/350
= 2 seconds.
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31. Which of the following is true?

Correct Ans:Power = work done/time
Explanation:
Power = work done/time
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32. An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a month of 28 days, if one unit costs 3.00 rupees?

Correct Ans:Rs. 168
Explanation:
Power = 1000 W = 1 KW
Time per day = 2 hour
Total time = 2*28 = 56 hour
Energy = power * time
= 1 * 56
= 56 KWH

Now 1 KWH costs Rs 3
Then 56 KWH will cost = 3 * 56 = Rs. 168
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33. Energy possessed by a body due to its stationary is called its

Correct Ans:potential energy
Explanation:
Potential energy is the energy possessed by a stationary body.
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34. A boy of mass 30 kg sits at a distance of 80 cm from the fulcrum of a seesaw. Calculate the mass of the other boy who is sitting at a distance of 16 cm from the fulcrum?

Correct Ans:150 kg
Explanation:
In fulcrum
---> Let effort be X
---> = (30)*(80) = (X)*(16)
---> = 16X = 2400
---> X = (2400/16)
---> = 150 kg
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35. Two bodies have velocity in (1:2) ratio both have same weight. The ratio of Their kinetic energy is

Correct Ans:(1:4)
Explanation:
---> Kinetic energy = (1/2) mv2
---> (Body a : body b)
---> ((1/2)mv2 : (1/2)mv2)
---> Velocity ratio
---> (1:2)
---> By putting velocity and mass in the
equation
---> Both have same mass so let mass = 1
---> = (Â½)*1*12 = (1/2)*1*22
---> = (12:22)
---> = (1:4)
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36. To determine the density of a solid we have to determine the ?

Correct Ans:Mass and volume
Explanation:
The molecules of different liquids have different size and mass. The mass and size of the molecules in a liquid and how closely they are packed together determine the density of the liquid. Just like a solid, the density of a liquid equals the mass of the liquid divided by its volume; D = (m/v).
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37. We use beam balance to measure ______.

Correct Ans:Weight
Explanation:
The beam balance measures the force exerted by the mass on the beam balance. The beam balance does not directly measure the mass. It uses the fact that the gravitational force on the object is proportional to its mass.
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38. Atmospheric humidity is measured by _________.

Correct Ans:Hygrometer
Explanation:
Hygrometer is the instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.

It uses a pair of thermometers standing side by side. One has a bulb open to the air; the other has a bulb covered in a wet cloth. You measure the humidity by comparing the readings from the two thermometers.
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39. Convert 2268 joules in calories?

Correct Ans:540
Explanation:
W.K.T: 1 calorie = 4.2 joule
---> 1 joule = (1/4.2) calorie
---> So, For 2268 joules = (2268 /4.2) calorie
= (22680/42) calorie
= 540 calorie
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40. The unit of power of lens is called ______.

Correct Ans:Dioptre
Explanation:
A dioptre is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres.
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