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.

1,006.

Emission spectra are caused by

A.

kinetic energy of moving atoms

B.

potential energy of an electron in an atom

C.

transition of an electron from a higher energy level to a lower energy level

D.

transition of an electron from a lower energy level to higher energy level

E.

transition of excited protons in the nucleus

Correct answer is C

No explanation has been provided for this answer.

1,007.

A current flows in a series circuit containing a resistor, R, an inductor, L and a capacitor, C. Which of the following is true of the power dissipated in the circuit component(s)?

A.

The power dissipated in L is greater than zero

B.

The power dissipated in R is zero

C.

The sum of the power dissipated in L and C is equal to that in R

D.

The sum of the power dissipated in L and C is greater than in R

E.

The sum of the power dissipated in L and C is zero

Correct answer is E

No explanation has been provided for this answer.

1,008.

When the same amount of current, I is passed through different wires under the same conditions, the rates of production of heat are

A.

directly proportional to I

B.

directly proportional to the resistances of the wires

C.

directly proportional to the square of the resistances of the wires

D.

inversely proportional to I

E.

inversely proportional to the resistance of the wires

Correct answer is B

No explanation has been provided for this answer.

1,009.

A car travels with a constant velocity of 45 kmh-1 for 20s. What distance does it cover in this time?

A.

0.025m

B.

0.250m

C.

2.500m

D.

25.000m

E.

250.000m

Correct answer is E

No explanation has been provided for this answer.

1,010.

Heat

I. is a form of energy
II. is measured with a thermometer
III. cannot be created or destroyed
IV. from a hot object is transferred through conduction only. Which of the statements above are correct?

A.

I and II only

B.

I and III only

C.

I, II and III only

D.

II, III and IV only

E.

I, II, III and IV

Correct answer is B

No explanation has been provided for this answer.