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 51: If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is
Options:
A) 5.00W
B) 4.00W
C) 2.00W
D) 25W
Show Answer
The correct answer is B .
-
Question 52:
Mercury is a better barometric fluid than water because
i. it needs no colouring
ii. its density is many times greater than that of water
iii. it does not wet glass
iv. it has a high vapour pressure
v. it has a high boiling point.
Which of the above statements are true?
Options:
A) i and ii only
B) i, ii and iii only
C) iii and iv only
D) iv and v only
E) iii, iv and v only
Show Answer
The correct answer is B .
-
Question 53: An air force jet flying with a speed of 335ms-1 went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?
Options:
A) 838m
B) 3350m
C) 670m
D) 1675m
E) 67m
Show Answer
The correct answer is D .
-
Question 54:
A ball of mass 0.5kg moving at 10ms collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.
Options:
A) 0.2ms
B) 0.5ms
C) 5.0ms
D) 5.5ms
Show Answer
The correct answer is C .
-
Question 55: the ratio of electrostatic force FE to gravitational force FG between two protons each of charge e and mass m, at a distance d is
Options:
A) e/4πԐoGm
B) e2/Gm2
C) Gm2/4πԐoe2
D) e2/4πԐoeGm2
Show Answer
The correct answer is D .
-
Question 56: The heat from the sun reaches the earth by the process
Options:
A) insulation
B) precipitation
C) conduction
D) convection
E) radiation
Show Answer
The correct answer is E .
-
Question 57: Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo
Options:
A) number of turns in the coil is increased
B) strength of the field magnet is increased
C) slip rings are replaced with split ring cummutator
D) coil is wound on a soft iron armature
Show Answer
The correct answer is C .
-
Question 58: A hydraulic press has a large circular piston of radius 0.8m and a circular plunger of radius 0.2m. A force of 500N is exerted by the plunger. Find the force exerted on the piston
Options:
A) 8000N
B) 4000N
C) 2000N
D) 31N
Show Answer
The correct answer is D .
-
Question 59: Three cells each of e.m.f. 1.5v and an internal resistance of 1.0 are connected in parallel across a load resistance of 2.67. Calculate the current in the load?
Options:
A) 0.26A
B) 0.41A
C) 0.50A
D) 0.79A
Show Answer
The correct answer is C .
-
Question 60:
In the diagram above , the current I is
Options:
A) 3/8
B) 9/11
C) 11/9
D) 8/3
Show Answer
The correct answer is B .