NECO Physics Past Questions & Answers - Page 43

211.

A body is uniformly accelerated from rest. Which of the following quantities vary/varies linearly with the square of the time?

I. Displacement
II. Velocity
III. Momentum

I only

II only

III only

I and II only

II and Ill only

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

212.

An object weighing 0.60N is hung on a spiral spring and caused it to extend by 6.0cm. The object is removed and a black of wood replacing it causes the spring to extend by 10.0cm. What is the weight of the block of wood?

0.10N

0.36N

0.80N

1.00N

3.60N

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

213.

When a current of 1 .0A flows in an electrolyte for 3.0h, a mass of 1 .0g is deposited. What mass will be deposited in 10.0h if a current of 3.0A flows through the electrolyte?

30.0g

24.0g

10.0g

6.0g

0.4g

View answer & explanation

Correct answer is C

Q = charge
i = current
t = time in sec

Mass(M1)
3hours to sec
60*60*3= 10800
Mass(M2)

10hours to sec
60*60*10 = 36,000
36,000 * 3.0A = 108,000

if it takes 10800 current to discharge 1g
how much will it take 108000

10800---->1
108000---x

= 108000/10800

=10