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.

1,212.

The force exerted on a charged body in an electric field depends on

I. the charge on the body
II. the electric field intensity
III. the square of the mass of the body

A.

I only

B.

II only

C.

I and II only

D.

I and III only

E.

II and III only

Correct answer is C

No explanation has been provided for this answer.

1,213.

An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively

A.

(A – 2) and (Z – 2)

B.

(A + 4) and (Z + 2)

C.

(A– 4) and (Z+2)

D.

(A+ 4) and (Z – 2)

E.

(A – 4) and (Z – 2)

Correct answer is E

Let the element be S and the element formed after emission be X.

\(\implies ^{A} _{Z}S \to ^{4} _{2}He + X\)

\(\therefore X = ^{A - 4} _{Z - 2}X\).

1,215.

When a lever is in equilibrium, under the action of two or more forces, the algebraic sum of the moments of the forces about the point of support is

A.

anti-clockwise

B.

clockwise

C.

equal to the product to the forces

D.

numerically equal to the total forces acting

E.

equal to zero

Correct answer is E

No explanation has been provided for this answer.