1) Multiple Choice Questions chapter 2 Mechanical Properties of Fluids maharashtra board

Question

i) A hydraulic lift is designed to lift heavy objects of maximum mass 2000 kg. The area of cross section of piston carrying the load is 2.25 Ã— 10^-2 m². What is the maximum pressure the smaller piston would have to bear?

(A) 0.8711 × 10⁶ N/m²

(B) 0.5862 ×10⁷ N/m²

(C) 0.4869 ×10⁵ N/m²

(D) 0.3271 ×10⁴ N/m²

 

ii) Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is

(A) 1:2 (B) 2:1 (C) 1:4 (D) 4:1

 

iii) The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly

(A) 0.9 × 10^-3 J

(B) 0.4 × 10^-3 J

(C) 0.7 × 10^-3 J

(D) 0.5×10^-3 J

 

iv) Two hail stones with radii in the ratio of 1:4 fall from a great height through the atmosphere. Then the ratio of their terminal velocities is

(A) 1:2 (B) 1:12 (C) 1:16 (D) 1:8

 

v) In Bernoulli's theorem, which of the following is conserved?

(A) linear momentum

(B) angular momentum

(C) mass

(D) energy

Answer 1

i) A hydraulic lift is designed to lift heavy objects of maximum mass 2000 kg. The area of cross section of piston carrying the load is 2.25 Ã— 10^-2 m². What is the maximum pressure the smaller piston would have to bear?

(A) 0.8711  × 10⁶ N/m²

(B) 0.5862 ×10⁷ N/m²

(C) 0.4869  ×10⁵ N/m²

(D) 0.3271  × 10⁴ N/m²

Answer

(A) 0.8711  × 10⁶ N/m² 

ii) Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is

(A) 1:2 (B) 2:1 (C) 1:4 (D) 4:1

Answer

(B) 2:1

iii) The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly

(A) 0.9  × 10^-3 J (B) 0.4  × 10^-3 J

(C) 0.7  ×10^-3 J (D) 0.5 × 10^-3 J

Answer

(A) 0.9  × 10^-3 J

iv) Two hail stones with radii in the ratio of 1:4 fall from a great height through the atmosphere. Then the ratio of their terminal velocities is

(A) 1:2 (B) 1:12 (C) 1:16 (D) 1:8

Answer

(C) 1:16

v) In Bernoulli's theorem, which of the following is conserved?

(A) linear momentum

(B) angular momentum

(C) mass

(D) energy

Answer

(D) energy - is conserved