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.
-
Question 61: The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?
Options:
A) 7500m
B) 300m
C) 75m
D) 15m
Show Answer
The correct answer is B .
-
Question 62: If the refractive index of crown glass is 1.51, its critical angel is.
Options:
A) 48.6°
B) 22.5°
C) 41.5°
D) 45.0°
Show Answer
The correct answer is C .
-
Question 63: Thermionic emission is the process whereby
Options:
A) β - rays are produced
B) holes are produced
C) x - rays are produced
D) electrons leave a hot element
Show Answer
The correct answer is D .
-
Question 64:
The figure above represents a frictionless pulley system in which a weight W is in equilibrium with a weight of 40N. Find the value of W.
Options:
A) 13.3N
B) 20.0N
C) 40.0N
D) 80.0N
Show Answer
The correct answer is C .
-
Question 65:
In the above circuit diagrams A is the ammeter and V is the Voltmeter. Which of the circuits is correct for finding the correct value of the resistance R
Options:
A) I
B) II
C) III
D) IV
Show Answer
The correct answer is A .
-
Question 66:
For a pear-shaped conductor shown above, the concentration of charge on the outside is highest at?
Options:
A) X
B) Z
C) Y
D) K
Show Answer
The correct answer is A .
-
Question 67: In a Daniel cell, the depolarizer, positive and negative electrodes are respectively
Options:
A) copper sulphate, copper and zinc
B) manganese dioxide, carbon and zinc
C) sulphuric acid, lead oxide and lead
D) potassium hydroxide, nickel and iron.
Show Answer
The correct answer is A .
-
Question 68: 4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?
Options:
A) 1 days
B) 8 days
C) 30 days
D) 80 days
Show Answer
The correct answer is C .
-
Question 69: A gas has a volume of 100cm3 at 27oC. If it is heated to temperature T until a final volume of 120cm3 is attained, calculate T
Options:
A) 33oC
B) 60oC
C) 87oC
D) 114oC
Show Answer
The correct answer is C .
-
Question 70: A good calorimeter should be of
Options:
A) low specific heat capacity and low heat conductivity
B) low specific heat capacity and high heat conductivity
C) high specific heat capacity and low heat conductivity
D) high specific heat capacity and low heat conductivity
E) dull surface and low heat conductivity
Show Answer
The correct answer is B .