Question

Due to thermal expansion with rise in temperature
(a) Metallic scale reading becomes lesser than true value
(b) Pendulum clock goes fast
(c) A flowing body sinks a little increases
(d) The weight of a body in a liquid increases

• A. only (a) is correct
• B. (a) & (b) are correct
• C. (a),(b) & (d) are correct
• D. (a),(c) & (d) are correct

Answer 1

The correct option is A only (a) is correct

(a)since length increases therefore true scale reading also shifts and true scale reading is lesser than the actual length.
(b)Time period = $2\pi \sqrt{L/g}$ of pendulum clock increases therefore, it gets slower not faster with increase in length of material
(c)since volume increases therefore, density of substance decreases hence the it floats
(d)Since density decreases weight of the oblect will also decrease in liquid.
Therefore only (a) is correct
Option(A) is correct