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 21: A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 103N, calculate the speed of the bullet just before it hits the wooden block.
Options:
A) 450ms-1
B) 400ms-1
C) 300ms-1
D) 250ms-1
Show Answer
The correct answer is C .
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Question 22:
I. Coherence
II. Same frequency
III. Same wavelength
IV. Same Intensity
Which of the conditions above are necessary to produce interference fringes?
Options:
A) I and III
B) I, II and IV
C) I, II and III
D) II and III
Show Answer
The correct answer is C .
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Question 23: A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?
Options:
A) 200
B) 1200
C) 1600
D) 2400
Show Answer
The correct answer is C .
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Question 24:
The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?
I. Lagging the Calorimeter
II. Ensuring that only S.I units are used
III. Weighing the calorimeter, the lid and the stirrer.
Options:
A) I only
B) I and II only
C) I and III only
D) II and III only
Show Answer
The correct answer is C .
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Question 25: A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?
Options:
A) 0.3m
B) 3.0m
C) 3.5m
D) 4.0m
Show Answer
The correct answer is B .
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Question 26:
In an elastic collisionI. Energy is conserved
II. Energy is decreased
III. Energy is increased
IV. Linear momentum conversed
Options:
A) I only
B) II and IV only
C) II only
D) III only
Show Answer
The correct answer is B .
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Question 27:
The figure above shows displacement-time graphs for three different motions. which of the following statements is correct
Options:
A) graph 2 corresponds to the highest velocity
B) graph 1 corresponds to zero gravity
C) graph 3 corresponds to a particle moving in the negative x direction
D) graph 2 corresponds to a particle moving in the positive x direction
Show Answer
The correct answer is D .
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Question 28: A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?
Options:
A) N4.80
B) N48.00
C) N480.00
D) N4800.00
Show Answer
The correct answer is C .
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Question 29: When white light is dispersed by a spectrometer, the component having the shortest wavelength is
Options:
A) orange
B) green
C) violet
D) red
Show Answer
The correct answer is C .
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Question 30: Which of the following statements is NOT correct?
Options:
A) A galvanometer can be converted to an ammeter with a different range by connecting a high resistance in series
B) An electric current always produces a magnetic field
C) Maxwell's screw rule states that if a corkscrew moves inthe direction of the current, the hand turns in the direction of the lines of force
D) Electromagnets are used in electric bells and telephone recievers
E) The lines of force round a straight current carrying conductor are circular
Show Answer
The correct answer is A .