# Physics Questions

Q:

The working principle of a washing machine is

 A) reverse osmosis B) diffusion C) centrifugation D) dialysis

Explanation:

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Q:

Nuclear sizes are expressed in a unit named

 A) Fermi B) Angstrom C) Newton D) Tesla

Explanation:

Nuclear sizes are expressed in a unit called "Fermi" which is a unit of length equal to 10−15 metre (one femtometre), used in nuclear physics. It is similar to the diameter of a proton.

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Q:

The speed of light will be minimum while passing through

 A) water B) vaccum C) air D) glass

Explanation:

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Q:

The most suitable unit for expressing nuclear radius is

 A) micro B) nanometre C) fermi D) angstrom

Explanation:

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Q:

Which of the following is not a vector quantity

 A) speed B) velocity C) torque D) displacement

Explanation:

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Q:

Rain drops acquire spherical shape due to

 A) viscosity B) surface tension C) friction D) elasticity

Explanation:

The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area

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Q:

It is more difficult to walk on ice than on a concrete road because

 A) there is very little friction between the ice and feet pressing it B) ice is soft when compared to concrete C) there is more friction between the ice and feer D) None of these

Answer & Explanation Answer: A) there is very little friction between the ice and feet pressing it

Explanation:

It is the friction between the feet and the ground that helps us to walk. Without this friction we would slip and fall

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Q:

Two electric bulbs marked 25W – 220V and 100W – 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?

 A) 25 W B) Both C) 100 W D) Neither

Explanation:

Resistances of both the bulbs are

R1=V^2/P1 = 220^2/25

R2 = V^2/P2 = 220^2/100

Hence

When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.