Multiplication of Vectors MCQs
1. A force of 50 N acts on a body and displaces it through a distance of 10 meters in a direction making an angle of 600 with the force. What is the work done by the force?
a) 100 J
b) 150 J
c) 200 J
d) 250 J
Answer: (d) 250 J
2. If the sum of two vectors is perpendicular to the difference between them. The ratio of their magnitude will be
a) 1
b) 2
c) 3
d) 4
Answer: (a) 1
Current Electricity MCQ
1. What does the internal resistance of a cell mean?
(a) The resistance of the material used in the cell
(b) The vessel of the cell
(c) The electrodes of the cell
(d) The electrolyte used in the cell
Answer: (d) The electrolyte used in the cell
2. A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?
(a) Because the method involves a combination
(b) There are cells involved
(c) Because of potential gradients
(d) As there is no flow of current through the galvanometer
Answer: (d) As there is no flow of current through the galvanometer
3. Consider copper and aluminium wire whose length and resistance are the same. Also, the specific resistance of aluminium is more than copper. Select the correct statement
(a) Copper and aluminium mass are the same
(b) Copper wire has more mass than the aluminium wire
(c) Copper wire has less mass than the aluminium wire
(d) The information given is incomplete
Answer: (d) The information given is incomplete
4. What is the ratio of power dissipated if two electric bulbs are connected in series and the ratio of their resistance is 1:2?
(a) 1:4
(b) 1:2
(c) 2:1
(d) 1: 1
Answer: (b) 1:2
5. What is the principle behind thermocouple
(a) Joule effect
(b) Thomson effect
(c) Seebeck effect
(d) Peltier effect
Answer: (c) Seebeck effect
