Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.
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Question 91: Which of the following electromagnetic waves has the shortest wavelength?
Options:
A) Radio waves
B) X-rays
C) Infra-red
D) Blue light
E) Ultraviolet
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The correct answer is B .
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Question 92:
A piece of substance of specific heatcapacity 450Jkgk falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms]
Options:
A) ºC
B) ºC
C) ºC
D) ºC
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The correct answer is B .
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Question 93: A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string
Options:
A) 15cm
B) 12cm
C) 10cm
D) 8cm
E) 5cm
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The correct answer is A .
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Question 94: A length of wire has a frequency of 255Hz when stretched by a force of b225N. If the fore increased to 324N, what is the new frequency of vibration
Options:
A) 306 Hz
B) 512 Hz
C) 488 Hz
D) 356 Hz
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The correct answer is A .
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Question 95: What is the cost of running seven 40 W lamps and five 80 W la mps for 12 hours of the electrical energy cost N7.00kWk?
Options:
A) N80.00
B) N45.36
C) N65.00
D) N57.12
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The correct answer is D .
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Question 96: Lodestone is a natural magnet, it points at
Options:
A) N – W when suspended freely
B) N–S when suspended freely
C) S – E when suspended freely
D) S–W when suspended freely
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The correct answer is B .
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Question 97:
An electron in a hydrogen atom makes a transition from the ground level to the third level. If the energy at the ground level,calculate the energy at the third level.
[h = 6.6 x 10-34Js; f = 1015Hz]
Options:
A) 1.41eV
B) 1.71eV
C) 1.61eV
D) 1.51eV
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The correct answer is D .
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Question 98:
Which of the following is not correct about the molecules of a substance in a gaseous state. They?
Options:
A) are in a constant state of motion
B) have different speeds
C) have a temperature which is measured by the average kinetic energy
D) The collision between the gases is perfectly inelastic
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The correct answer is D .
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Question 99:
In the figure above if the atmospheric pressure is 760mm, the pressure of the chamber G is
Options:
A) 660mm
B) 690mm
C) 830mm
D) 860mm
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The correct answer is C .
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Question 100:
A charge of C is placed in an electric field of intensity . What is the force acting on the electron?
Options:
A) 1.5 N
B) 3.7 N
C) 4.2 N
D) 2.5 N
Show Answer
The correct answer is A .