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 1151: Cathode rays are
Options:
A) high-energy electromagnetic waves
B) protons
C) streams of electrons
D) neutrons
E) radio waves
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The correct answer is C .
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Question 1152:
A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?
Options:
A) 20
B) 250
C) 200
D) 500
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The correct answer is D .
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Question 1153: A transformer which can produce 8V from a 240v a.c. supply, has an efficiency of 80%. If the current in the secondary coil is 15A, calculate the current in the primary coil.
Options:
A) 0.625A
B) 1.600A
C) 2.500A
D) 6.250A
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The correct answer is A .
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Question 1154: A body which weighs 50N in air displaces 3.7kg of water when partially immersed in water. Calculate the upthrust on the body?
Options:
A) 8.7N
B) 37.0N
C) 87.0N
D) 13.0N
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The correct answer is B .
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Question 1155:
An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is?
Options:
A) 3 days
B) 2 days
C) 1 day
D) 4 days
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The correct answer is B .
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Question 1156: An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object and the image is
Options:
A) 80cm
B) 40cm
C) 50cm
D) 70cm
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The correct answer is B .
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Question 1157: Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane?
Options:
A) Random and rotational
B) Rotational and oscillatory
C) Rotational only
D) Translations only
E) Translational and rotational
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The correct answer is E .
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Question 1158: Which of the following pairs of musical instruments produce sound due to the vibration of air column?
Options:
A) Bell and piano
B) Guitar and flute
C) Trumpet and drum
D) Trumpet and flute
E) Violin and organ
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The correct answer is D .
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Question 1159: When a yellow card is viewed in blue light, It will appear
Options:
A) black
B) orange
C) purple
D) red
E) white
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The correct answer is D .
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Question 1160: Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg-1 . Specific heat capacity of water 4.2Jg-1 K-1]
Options:
A) 840J
B) 3360J
C) 3420J
D) 4200J
E) 7560J
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The correct answer is E .