999+ Physics Questions Answers Explanation MCQ

Q:

Air pressure is measured in which of the following units?

A) Steridian	B) kg/mts
C) Newton	D) Pascal

Answer & Explanation Answer: D) Pascal

Explanation:

Pressure = (Net Force) / (Applied area) = Newton / square meters

Measuring units of pressure are:

. Pascal
. Bar
. Torr
. Pounds per square inch (psi)
. Standard atmosphere (atm).

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Q:

Acceptable noise level for human ear

A) > 85 db	B) = 85 db
C) < 85 db	D) None of the above

Answer & Explanation Answer: C) < 85 db

Explanation:

Sound intensity or level is measured by a unit called a decibel. An 85 decibel noise level is not a safe standard for the public.

Hence, Acceptable noise level for human ear is less than 85 db.

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Q:

Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?

A) 200 nm and 500 nm	B) 500 nm and 1000 nm
C) 500 nm only	D) 200 nm and 1000 nm

Answer & Explanation Answer: C) 500 nm only

Explanation:

Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.

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Q:

The law of conservation of energy states that

A) energy can neither be created nor destroyed	B) energy can either be created nor destroyed
C) energy can neither be created or destroyed	D) energy can either be created or destroyed

Answer & Explanation Answer: A) energy can neither be created nor destroyed

Explanation:

The law of conservation of energy is a law of science which states that energy can neither be created nor destroyed - only converted from one form of energy to another.

In 1842, Julius Robert Mayer discovered the Law of Conservation of Energy.

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Q:

The mass defect is the result of what action occurring?

A) mass being converted to energy when protons and neutrons bind together in a nucleus	B) protons and electrons being attracted to each other
C) energy being converted into moles of atoms when neutrons break apart protons	D) mass being converted to energy when protons and neutrons break apart in a nucleus

Answer & Explanation Answer: A) mass being converted to energy when protons and neutrons bind together in a nucleus

Explanation:

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Q:

What property of matter is momentum related to?

A) mass	B) velocity
C) Both A & B	D) None of the above

Answer & Explanation Answer: C) Both A & B

Explanation:

At any given speed, momentum is directly proportional to mass of an object.

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Q:

Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

A) 2R	B) R/2
C) 5R/4	D) 3R/4

Answer & Explanation Answer: C) 5R/4

Explanation:

So, resistance of Wire 2 is R/4 as radius is half of wire 1, so area would be 4 times of wire 1.

Now for resistance in series. R= R1 + R2.

Therefore, Final R= R + R/4 = 5R/4

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Q:

Contact force is another name for _________.

A) Friction	B) Magnetic force
C) Electrostatic force	D) Muscular force

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