A nuclide X is produced by bombarding a nitrogen(N) nucleus with an alpha(\alpha\) particle with the release of heavy hydrogen(D) nucleus as shown by the following nuclear equation, \(\alpha + ^{14}_{7}N \to ^p_qX + ^2_1D\). Determine the values of p and q in the equation
A12 and 6
B14 and 7
C16 and 8
D19 and 8
View Explanation & Discuss
Question 2
waec2002
Which of the following materials is used to control the rate of neutron production in a nuclear reactor?
Aboron rods
Bconcrete shield
Cgraphite rods
Duranium rods
View Explanation & Discuss
Question 3
waec2002
Which of the following is usually used to cause fission in an atomic reactor?
AAlpha particles
Bbeta particles
Celectrons
DNeutrons
View Explanation & Discuss
Question 4
waec2002
If a radioactive atom emits a beta particle, Its mass number
Aincreases by one
Bremains the same
Cdecreases by one
Dincreases by two
View Explanation & Discuss
Question 5
waec2002
In a model of the hydrogen atom, the energy levels Wn are given by the formula Wn = -\(\frac{R}{n^2}\), where n is an integer and R is a constant. Determine the energy released in the transition from n = 3 to n = 2.
A\(\frac{R}{5}\)
B-\(\frac{R}{4}\)
C\(\frac{5R}{36}\)
D\(\frac{-5R}{36}\)
View Explanation & Discuss
Question 6
waec2002
Calculate the inductance L, of the coil in the circuit diagram shown above
A3.8H
B0.6H
C0.4H
D0.2H
View Explanation & Discuss
Question 7
waec2002
A freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately
Anorth-south
Bsouth-west
Cnorth-east
Dsouth-east
View Explanation & Discuss
Question 8
waec2002
A transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively. calculate the efficiency of the transformer?
A85.0%
B83.3%
C37.5%
D30.0%
View Explanation & Discuss
Question 9
waec2002
Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the
Astrength of the magnet
Bnumber of turns in the coil
Cspeed of location in the coil
Dgap between the poles of the magnet
View Explanation & Discuss
Question 10
waec2002
The lead-acid accumulator consists of a
Alead as the positive electrode
Blead ocide as the negative electrode
Chydrochloric acid as the electrolyte
Dtetraoxosulphate(VI) acid as the electrolyte
View Explanation & Discuss
Question 11
waec2002
Local actions is normally prevented in a simple electric cell by
Aintroducing an oxidizing agent in the acid
Bnot drawing current continously for long period
Camalgamating the surface of the zinc plate
Dusing a porous pot to isolate the zinc plate from the acid
View Explanation & Discuss
Question 12
waec2002
The magnitude of the gravitational attraction between the earth and a particle is 40N. If the mass of the particle is 4kg. Calculate the magnitude of the gravitational field intensity of the earth on the particle
A10.0N kg-1
B12.6N kg-1
C25.0N kg-1
D160.0N kg-1
View Explanation & Discuss
Question 13
waec2002
Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10-11Nm-2kg-2]
A6.70 x 10-11N
B6.70 x 10-10N
C6.03 x 10-11N
D6.03 x 10-7N
View Explanation & Discuss
Question 14
waec2002
Three capacitors each of capacitance 18\(\mu F\) are connected in series. Calculate the effective capacitance of the capacitors
A54.00\(\mu F\)
B18.00\(\mu F\)
C6.00\(\mu F\)
D0.17\(\mu F\)
View Explanation & Discuss
Question 15
waec2002
Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?
Aebonite rod
Bgold leaf electroscope
Cproof plane
Dthe electrophorus
View Explanation & Discuss
Question 16
waec2002
Which of the following actions will not cause an increase in the frequency of a vibrating string?
Aincreasing the tension of the string
Bdecrease the mass per unit lengthof the string
Cdecrease the length of the string
Dincreasing the cross sectional area of the string
View Explanation & Discuss
Question 17
waec2002
Which of the following instruments is not a wind instrument?
Aclarinet
Bsaxophone
Ctrumpet
Dxylophone
View Explanation & Discuss
Question 18
waec2002
When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called
Abeats
Bdiffraction
Covertones
Dresonance
View Explanation & Discuss
Question 19
waec2002
A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560ms-1]
A312.0m
B156.0m
C78.0m
D31.2m
View Explanation & Discuss
Question 20
waec2002
In a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. If the final image is at 25.0cm from the eye lens, calculate the focal length of the eye lens
