Question 4521:

• NECO 2004

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

Question 4522:

• NECO 2004

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

Question 4523:

• NECO 2004

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

Question 4524:

• NECO 2004

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

Question 4525:

• NECO 2004

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.