With an increase in temperature, the viscosity of liquid and gas, respectively will

(a)

increase and increase

(b)

increase and decrease

(c)

decrease and increase

(d)

decrease and decrease

Which of the following is not a scalar?

(a)

viscosity

(b)

surface tension

(c)

pressure

(d)

stress

Copper of fixed volume V is drawn into a wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is Δl. If Y represents the Young’s modulus, then which of the following graphs is a straight line?

(a)

\(\Delta\)l verses V

(b)

\(\Delta\)l  verses Y

(c)

\(\Delta\)l  verses F

(d)

\(\Delta\)l  verses \(\frac{1}{l}\)

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

(a)

length = 200 cm, diameter = 0.5 mm

(b)

length= 200 cm, diameter = 1 mm

(c)

length = 200 cm, diameter = 2 mm

(d)

length= 200 cm, diameter = 3 m

In a horizontal pipe of non-uniform cross section, water flows with a velocity of 1 ms^-1 at a point where the diameter of the pipe is 20 cm. The velocity of water (1.5 m s^-1) at a point where the diameter of the pipe is (in cm)

(a)

8

(b)

16

(c)

24

(d)

32