Physics Questions

Q:

Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days 

A) the pores in the pot are closed B) rain water stops oozing out from the pores
C) the water that oozes out does not evaporate quickely because of the large percent age of moisture in the air D) surface of the pot becomes damp
 
Answer & Explanation Answer: C) the water that oozes out does not evaporate quickely because of the large percent age of moisture in the air

Explanation:

To evaporate the water that oozes out, heat is required. Part of this heat is taken from the water inside which therefore become cool. Therefore (C) is correct. Here evaporation is less, so cooling too is less.

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Q:

Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be

A) 2 B) 6
C) 5 D) 3
 
Answer & Explanation Answer: B) 6

Explanation:

Number of spectral lines from a state n to ground state is

 

                   n(n-1)/2 = 6

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11 6450
Q:

What type of simple machine is an axe?

A) Lever B) Wedge
C) Both A & B D) The screw
 
Answer & Explanation Answer: C) Both A & B

Explanation:

The simple machine Axe is made up of both the lever arm and a wedge.

                              what_type_of_simple_machine_is_an_axe1536562753.png image

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4 6383
Q:

When an electric bulb breaks , there is an explosive sound. That is due to

A) the chemical reaction between the gases inside the bulb B) the compressed gases inside rushing out suddenly
C) the air outside rushing in to fill the vacuum inside the bulb D) None of these
 
Answer & Explanation Answer: C) the air outside rushing in to fill the vacuum inside the bulb

Explanation:

The inside of the bulb being a vacuum, the outside air rushes in when the bulb is broken. The vibrations of the rushing air molecules produce the sound.

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13 6375
Q:

Which of the following physical quantities have the same dimensions

A) momentum and impulse B) power and young modulus
C) Energy and angular Momentum D) force constant and moment of inertia
 
Answer & Explanation Answer: A) momentum and impulse

Explanation:
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Q:

Skids occur when the brakes are applied so hard that the front or rear wheels lose traction are called as

A) Cornering B) BLowout
C) Power D) Braking
 
Answer & Explanation Answer: D) Braking

Explanation:

A skid happens whenever the tires lose their grip on the road. Braking skids occur when the brakes are applied so hard that the front or rear wheels lose traction.

Skids_occur_when_the_brakes_are_applied1561010817.jpg image

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1 6272
Q:

Which one of the following groups have quantities that do not have the same dimensions

A) pressure, stress B) velocity, speed
C) force, impulse D) work, energy
 
Answer & Explanation Answer: C) force, impulse

Explanation:
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9 6100
Q:

A convex mirror is used to form an image of a real object. The image

A) is diminished in size B) is erect
C) always lies between the pole and the focus D) all of the above
 
Answer & Explanation Answer: D) all of the above

Explanation:
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