Ctransition of an electron from a higher energy level to a lower energy level
Dtransition of an electron from a lower energy level to higher energy level
Etransition of excited protons in the nucleus.
View Explanation & Discuss
Question 52
neco2004
A current flows in a series circuit containing a resistor, R, an inductor, L and a capacitor, C. Which of the following is true of the power dissipated in the circuit component(s)?
AThe power dissipated in L is greater than zero
BThe power dissipated in R is zero
CThe sum of the power dissipated in L and C is equal to that in R
DThe sum of the power dissipated in L and C is greater than in R
EThe sum of the power dissipated in L and C is zero
View Explanation & Discuss
Question 53
neco2004
When the same amount of current, I is passed through different wires under the same conditions, the rates of production of heat are
Adirectly proportional to I
Bdirectly proportional to the resistances of the wires
Cdirectly proportional to the square of the resistances of the wires
Dinversely proportional to I
Einversely proportional to the resistance of the wires
View Explanation & Discuss
Question 54
neco2004
A car travels with a constant velocity of 45 kmh-1 for 20s. What distance does it cover in this time?
A0.025m
B0.250m
C2.500m
D25.000m
E250.000m
View Explanation & Discuss
Question 55
neco2004
Heat
I. is a form of energy
II. is measured with a thermometer
III. cannot be created or destroyed
IV. from a hot object is transferred through conduction only. Which of the statements above are correct?
AI and II only
BI and III only
CI, II and III only
DII, III and IV only
EI, II, III and IV
View Explanation & Discuss
Question 56
neco2004
In which of the following are crystalline structures observable?
I. Gas
II. Liquid
III. Solid
AI only
BII only
CIII only
DI and III only
EII and III only
View Explanation & Discuss
Question 57
neco2004
The rate of diffusion of gases increases with increase(s) in
I. density
II. temperature
III, mass. Which is/are correct?
AI only
BII only
CI and II only
DII and III only
EI, II and III
View Explanation & Discuss
Question 58
neco2004
A stone is dropped from the top of a tower of height 11 .25m. Calculate the time it will take to reach the ground. [g = 10ms-2]
A1.00s
B1.50s
C2.25s
D2.50s
E3.00s
View Explanation & Discuss
Question 59
neco2004
A body has masses of 0.013kg and 0.012 kg in oil and water respectively. If the relative density of oil is 0.875 calculate the mass of the body.
A0.02 kg
B0.03kg
C0.04kg
D0.05kg
E0.06kg
View Explanation & Discuss
Question 60
neco2004
What is the uncertainty in the measurement of time, if the uncertainty in measuring the energy of an electron of mass 10-30 kg is 2.45 × 10-19J? h = 6.6 × 10-34
A1.35 ×10-15s
B2.69 × 10-15s
C4.15 × 10-15s
D9.05 × 10-15s
E1.62 × 10-14s
View Explanation & Discuss
Question 61
neco2004
Calculate the wavelength of light travelling with a speed of 3 × 108ms-1 and a frequency of 6.2 × 1014Hz.
A4.8 × 10-8m
B4.8 × 10-7m
C4.8 × 10-6m
D4.8 × 10-5m
E4.8 × 10-4m
View Explanation & Discuss
Question 62
neco2004
A surface in the path of an advancing wave on which all the particles are in the same state of disturbance is called a
Acrest
Bcycle
Cpulse
Dtrough
Ewave front
View Explanation & Discuss
Question 63
neco2004
A note, A from a guitar produces a wave of amplitude 4 mm and frequency 1000 Hz. Another note, B from a whistle produces a similar waveform of amplitude 2 mm and frequency 2200 Hz. If the two notes are compared,
AA has a higher pitch than B
BA is louder than B.
CB has a greater speed than A
DB is louder than A
EA and B have the same quality
View Explanation & Discuss
Question 64
neco2004
Which property of a fluid determines its suitability as a lubricant?
ACapillarity
BDiffusion
CSolubility
DSurface tension
EViscosity
View Explanation & Discuss
Question 65
neco2004
For total internal reflection to occur,
I. light must be travelling from an optically more dense to an optically less dense medium.
II. the angle of incidence in the denser medium must be greater than its critical angle.
III. the angle of refraction in the less dense medium must be equal to 90 °. Which of the statements above is/are correct?
AI only
BII only
CIII only
DI and II only
EII and III only.
View Explanation & Discuss
Question 66
neco2004
A projectile fired with initial velocity, u will attain its maximum height H when the angle of projection θ is
A30°
B45°
C60°
D75°
E90°
View Explanation & Discuss
Question 67
neco2004
Which to the following is NOT a fundamental unit?
AAmpere
BKelvin
CKilogramme
DNewton
ESecond
View Explanation & Discuss
Question 68
neco2004
An electron makes a transition from - 1.60 eV energy level to - 10.4eV energy level Calculate the energy loss due to the transition.
A16.64eV
B12.00eV
C10.40eV
D8.80eV
E6.50eV
View Explanation & Discuss
Question 69
neco2004
When very hot water is poured into a thin-walled glass container, it is less likely to break because
Aall parts of the container got heated-uniformly
Bglass can withstand a very high temperature
Cthe molecules of glass are too far apart to cause breakages of the container
Dthe outer part of the container is cooler than the inner part
Ethin glass does not expand fast
View Explanation & Discuss
Question 70
neco2004
The frequency of a body executing simple harmonic motion when left undisturbed is known as__________ frequency.
