Question 4381:

• NECO 2001

Totally reflecting prisms are preferred to mirrors in periscopes because

I. mirror givegive multiple images
II. silvering on mirrors is easy damaged
III. mirrors reflect less light than totally reflecting prisms

A. I only
B. I and II only
C. I and III only
D. II and III only
E. I,II and III

Question 4382:

• NECO 2001

What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?

A. 2.0 × 10^-4J
B. 8.0 ×10^-4J
C. 4.0 × 10^-3J
D. 8.0 × 10^-3J
E. 1.6 × 10^-2J

Question 4383:

• NECO 2001

Notes of the same frequency sounded on a piano and on a flute may differ in

I. pitch
II. quality
III. Loudness

A. I only
B. II only
C. I and III only
D. II and III only
E. I, II and III

Question 4384:

• NECO 2001

What is X in the equation given below? 42He + 94Be → 126C + X

A. Electron
B. Hydrogen
C. Lithium
D. Neutron
E. Proton

Question 4385:

• NECO 2001

A waterfall is 630m high. What is the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall? (Neglect heat losses to the surroundings, take g as 10 ms-2 and specific heat capacity of weather as 4200,J kg-1K-1

A. 0.15°C
B. 1.50°C
C. 15.00°C
D. 21.00 °C
E. 50.00°C