The most suitable instrument for measuring the diameter of a thin wire is a
meter rule
micrometer screw gauge
pair of dividers
pair of engineer’s calipers
venire calipers
Correct answer is B
No explanation has been provided for this answer.
When the total product starts falling, then the marginal product is
Constant
Increasing
Maximum
Negative
Zero
Correct answer is D
No explanation has been provided for this answer.
2.93A
3.16A
3.42A
25.60A
27.68A
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements is correct about volatile liquids? They have
low boiling point
Low evaporating rate
high conductivity
high density
high viscosity
Correct answer is A
No explanation has been provided for this answer.
The work done in extending a spring by 40 mm is 1.52J. Calculate the elastic constant of the spring.
38.8 Nm-1
60.8 Nm-1
190.0 Nm-1
1900.0 Nm-1
3800.0 Nm-1
Correct answer is D
Force = Elastic constant x extension
Work done = \(\frac{1}{2} K \times e^2\)
Given Work done = 1.52J; Elastic constant (k) = ?; e = 40mm = 0.04 m
\(\therefore 1.52 = \frac{k \times (0.04)^2}{2}\)
\(3.04 = k \times 1.6 \times 10^{-3}\)
\(k = \frac{3.04}{1.6} \times 10^3\)
= 1.9 x 10\(^3\)
= 1900 Nm\(^{-1}\)