Questions and answers for exam Preparation

MCQs

Total Questions : 150 | Page 3 of 15 pages

Question 21. Two wires have their lengths, diameters and resistances all in the ratio 1:2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is

5 ohm
10 ohm
20 ohm
40 ohm

Discuss Question

Answer: Option B. -> 10 ohm
:
B
Option:(b)

Question 22. Match List I with List II and choose the correct answer from the codes given below the lists.

Codes:

A-2,B-1,C-4,D-3
A-2,B-4,C-3,D-1
A-3,B-1,C-2,D-4
A-3,B-4,C-2,D-1

Discuss Question

Answer: Option A. -> A-2,B-1,C-4,D-3
:
A
Option:(a)

Question 23. To achieve high value of rocket velocity, one must have

high exhaust velocity and low loss of mass during propulsion
high exhaust velocity and higher loss of mass during propulsion
low exhaust velocity and higher loss of mass during propulsion
None of the above

Discuss Question

Answer: Option B. -> high exhaust velocity and higher loss of mass during propulsion
:
B
Option:(b)

Question 24. Four wires of same material and of dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?

Wire of 1 m length and 2 mm diameter
Wire of 2 m length and 2 mm diameter
Wire of 3 m length and 1.5 mm diameter
Wire of 1 m length and 1 mm diameter

Discuss Question

Answer: Option C. -> Wire of 3 m length and 1.5 mm diameter
:
C
Option:(c)

Question 25. Assertion (A): The weight of a body decreases with the increase of altitude on earth.
Reason (R): The earth is not a perfect sphere.
Codes

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true

Discuss Question

Answer: Option B. -> Both A and R are true but R is not a correct explanation of A
:
B
Option:(b)

Question 26. An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then

remains horizontal
is inclined to the horizontal with smaller depth at the rear end
is inclined to the horizontal with larger depth at the rear end
assumes parabolic curve

Discuss Question

Answer: Option C. -> is inclined to the horizontal with larger depth at the rear end
:
C
Option:(c)

Question 27. Match List I with List II and choose the correct answer from the codes given below the lists.

A -1 B -2 C -3 D -4
A -3 B -2 C -4 D -1
A -3 B -4 C -1 D -2
A -4 B -1 C -3 D -2

Discuss Question

Answer: Option C. -> A -3 B -4 C -1 D -2
:
C
Option:(c)

Question 28. Consider the following statements regarding a motor car battery
1.The voltage is usually 12 V.
2.Electrolyte used is hydrochloric acid
3.Electrodes are lead and copper.
4.Capacity is expressed in ampere-hour.
Which of the above statements are correct?