1997 - WAEC Physics Past Questions and Answers - page 3
21
Which of the following is not correct about the Rutherford’s model of an atom?
A
The mass of an atom is concentrated around the nucleus
B
The nucleus of an atom is positively charged
C
The nucleus is surrounded by the electron cloud
D
The model is applicable to atoms with only one electron in the outer shell
correct option: d
Users' Answers & Comments22
The ratio of tensile stress to tensile strain is known as
A
Modulus of integrity
B
Modulus of elasticity
C
Shear modulus
D
Bulk modulus
correct option: e
Users' Answers & Comments23
Which of the following statements is not true of nuclear fission?
A
Mother nucleus is broken into two daughter nuclei of roughly equal parts
B
Neutron is normally used in bombarding heavy nucleus
C
Two light nuclei are made to combine to form a heavy nucleus
D
Very enormous energy is released
correct option: c
Users' Answers & Comments24
When a paint brush is removed from clean water, the bristles of the brush are pulled together because of
A
The viscosity of the surrounding air
B
The low density of water
C
Surface tension forces
D
The weight of the brush bristles
correct option: c
Users' Answers & Comments25
The half-life of a radioactive material is 6hrs. What quantity of 1kg of the material would decay in 24 hours?
A
15/16kg
B
1/2kg
C
1/4kg
D
1/8kg
correct option: e
Users' Answers & Comments26
The odor of a leaking gas is perceived at a distance from the source. This is made possible by the process of
A
Sublimation
B
Diffusion
C
Osmosis
D
Evaporation
correct option: b
Users' Answers & Comments27
Lenz’s law of electromagnetic induction is essentially a statement of the
A
Inverse square law of gravitation
B
Inverse square law of magnetism
C
Inverse square law of electrostatics
D
Law of conservation of momentum
correct option: e
Users' Answers & Comments28
The relationship between the directions of magnetic field, the current-carrying wire in the field is easily remembered using
A
Octet rule
B
Right hand grip rule
C
Maxwell’s screw rule
D
Ampere’s swimming rule
correct option: e
Users' Answers & Comments29
The current in the primary coil of a transformer is 2.5A. If the coil has 50 turns and the secondary250 turns, calculate the current in the secondary coil. Neglect energy losses in the transformer
A
0.2A
B
0.5A
C
2.5A
D
5A
correct option: b
\(\frac{I_s}{I_p}=\frac{n_p}{n_s}, I_s= \frac{I_pn_p}{n_s}=\frac{2.5\times50}{250}\Rightarrow0.5A\)
Users' Answers & Comments30
In a photocell, light energy is converted to
A
Electrical energy
B
Chemical energy
C
Heat energy
D
Mechanical energy
correct option: a
Users' Answers & Comments