JAMB Physics Past Questions & Answers - Page 295

1,471.

A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

A.

in front of his palm

B.

behind his palm

C.

beside his palm

D.

into his palm

Correct answer is D

No explanation has been provided for this answer.

1,472.

Which of the following affects the period of a simple pendulum?

i. mass of the pendulum bob.
ii. length of the pendulum.
iii. acceleration due to gravity.

A.

i, ii, and iii

B.

ii and iii only

C.

i and iii only

D.

i and ii only

Correct answer is B

No explanation has been provided for this answer.

1,473.

What is the least possible error in using a rule graduated in centimeters?

A.

0.1cm

B.

0.5cm

C.

1.0cm

D.

2.0cm

Correct answer is A

No explanation has been provided for this answer.

1,474.

The kinetic theory of photoelectron liberated from a metallic surface depends on the

A.

intensity of the incident radiation

B.

time duration of the incident radiation

C.

temperature of the incident radiation

D.

frequency of the incident radiation

Correct answer is D

No explanation has been provided for this answer.

1,475.

An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by

A.

\(^{222}_{82}Z\)

B.

\(^{222}_{88}Z\)

C.

\(^{226}_{86}Z\)

D.

\(^{226}_{80}Z\)

Correct answer is B

\(^{226}_{88}X\) \(\to\) \((^{0}_{-1}e)\) + \(^{4}_{2}\alpha\) + \(^{b}_{a}X\)

a + 2 + (-2) = 88 a \(\Rightarrow\) a = 88

b + 4 + 0 = 266 b \(\Rightarrow\) b = 222