Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

2,296.

The density of a solid is defined as the

A.

mass of the solid compared to the mass of an equal volume of water

B.

amount of water displaced when a unit mass of thesolid is immersed in it

C.

weight per unit volume of the solid

D.

volume per unit mass of the solid

E.

mass per unit volume of the solid

Correct answer is E

The density of a solid is defined as mass per unit volume of the solid

2,297.

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

A.

\(\frac{mv^2}{r}\)

B.

\(\frac{mr^2}{v}\)

C.

\(\frac{mr}{v}\)

D.

\(\frac{mv}{r^2}\)

E.

\(\frac{mv}{r}\)

Correct answer is A

No explanation has been provided for this answer.

2,298.

To determine the weight of an object you could

A.

use a beam balance

B.

use a spring balance

C.

find the force necessary

D.

use none of these methods

E.

use any of these methods

Correct answer is B

The weight of an object is found with a SPRING BALANCE.

2,299.

The internationally agreed system of units(SI) for physical measurements are

A.

Ib, ft, sec

B.

g, m, sec

C.

kg, m, sec

D.

cm, g, sec

E.

kg, cm, sec

Correct answer is C

No explanation has been provided for this answer.

2,300.

Mercury is a better barometric fluid than water because

i. it needs no colouring
ii. its density is many times greater than that of water
iii. it does not wet glass
iv. it has a high vapour pressure
v. it has a high boiling point.

Which of the above statements are true?

A.

i and ii only

B.

i, ii and iii only

C.

iii and iv only

D.

iv and v only

E.

iii, iv and v only

Correct answer is B

The advantages of use of mercury in a barometer are :

  1. its density is very high.
  2. it has low vapor pressure.
  3. its rate of evaporation is not very high.
  4. it neither wets nor sticks to glass.
  5. its surface is shining and opaque.