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 471: The r.m.s value of a supply voltage is quoted at 200v. What is the approximate peak value of the voltage?
Options:
A) 200volts
B) 300volts
C) 283volts
D) 250volts
Show Answer
The correct answer is C .
-
Question 472: The speed of sound in air at sea-level is 340ms-1 while that of light is 300 000kms-1. How far (to the nearest meter) from the center of a thunderstorm is an observer who hears a thunder 2s after a lightening flash?
Options:
A) 170ms-1
B) 340ms-1
C) 600ms-1
D) 680ms-1
Show Answer
The correct answer is D .
-
Question 473: A force F required to keep a 5 kg mass moving round a cycle of radius 3.5 m at a speed of 7 ms-1. What is the speed, if the force is tripled?
Options:
A) 4.0 ms-1
B) 6.6 ms-1
C) 12.1 ms-1
D) 21.0 ms-1
Show Answer
The correct answer is C .
-
Question 474: It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?
Options:
A) an electron
B) a -particle
C) an -particle
D) a proton
E) an atom
Show Answer
The correct answer is D .
-
Question 475:
A progressive wave equation is represented by y = a sin(150 πt - πx/4). if the phase difference of a progressive wave is 45°, the value of x in the equation is
Options:
A) 3 cm
B) 4 cm
C) 1 cm
D) 2 cm
Show Answer
The correct answer is C .
-
Question 476: 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
Show Answer
The correct answer is A .
-
Question 477: The instrument that measures both a.c and d.c is?
Options:
A) a current balance
B) a moving current ammeter
C) a moving iron ammeter
D) an inverter
Show Answer
The correct answer is C .
-
Question 478:
A body of mass 10kg on a smooth inclined plane is connected to a smooth pulley to a mass of 15kg as shown above, the acceleration of the system is
Options:
A) 1/4g
B) 8/25g
C) 1/2g
D) 2/5g
E) 3/4g
Show Answer
The correct answer is D .
-
Question 479: In homes, electrical appliances and lamps are connected in parallel because
Options:
A) Parallel connections do not heat up the wires
B) series connections use high voltage
C) less current will be used
D) less voltage will be used
Show Answer
The correct answer is C .
-
Question 480: 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 .