Questions and answers for exam Preparation

MCQs

Total Questions : 1284 | Page 6 of 129 pages

Question 51. ‘u₁’ and ‘u₂’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v₁’ and ‘v₂’. as per newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

e = v₁ - v₂/u₂ - u₁
e = u₂ - u₁/v₁ - v₂
e = v₂ - v₁/u₁ - u₂
e = v₁ - v₂/u₂ + u₁

Discuss Question

Answer: Option C. -> e = v₂ - v₁/u₁ - u₂

Question 52. ‘u₁’ and ‘u₂’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v₁’ and ‘v₂’. as per newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

e = v₁ - v₂/u₂ - u₁
e = u₂ - u₁/v₁ - v₂
e = v₂ - v₁/u₁ - u₂
e = v₁ - v₂/u₂ + u₁

Discuss Question

Answer: Option C. -> e = v₂ - v₁/u₁ - u₂

Question 53. ‘ω’ rad/sec is the angular velocity of a crank whose radius is ‘r’. if it makes θ° with inner dead centre and obliquity of the connecting rod ‘l’ is ‘ϕ’, the velocity v of the piston, is given by the equation

ω² (l cos ϕ + r sin ϕ tan θ)
ω² (l sin ϕ + r cos φ tan θ)
ω (l sin ϕ + r cos ϕ tan θ)
ω² (l sin ϕ - r cos θ tan ϕ)

Discuss Question

Answer: Option C. -> ω (l sin ϕ + r cos ϕ tan θ)

Question 54. ‘ω’ rad/sec is the angular velocity of a crank whose radius is ‘r’. if it makes θ° with inner dead centre and obliquity of the connecting rod ‘l’ is ‘ϕ’, the velocity v of the piston, is given by the equation

ω² (l cos ϕ + r sin ϕ tan θ)
ω² (l sin ϕ + r cos φ tan θ)
ω (l sin ϕ + r cos ϕ tan θ)
ω² (l sin ϕ - r cos θ tan ϕ)

Discuss Question

Answer: Option C. -> ω (l sin ϕ + r cos ϕ tan θ)

Question 55. ‘ω’ rad/sec is the angular velocity of a crank whose radius is ‘r’. if it makes θ° with inner dead centre and obliquity of the connecting rod ‘l’ is ‘ϕ’, the velocity v of the piston, is given by the equation

ω² (l cos ϕ + r sin ϕ tan θ)
ω² (l sin ϕ + r cos φ tan θ)
ω (l sin ϕ + r cos ϕ tan θ)
ω² (l sin ϕ - r cos θ tan ϕ)

Discuss Question

Answer: Option C. -> ω (l sin ϕ + r cos ϕ tan θ)

Question 56. Ball ‘a’ of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball ‘b’ on the table. if the impact is perfectly elastic, the velocity of the ball ‘b’ just after impact would be

Zero
5 m/sec
10 m/sec
None of these

Discuss Question

Answer: Option C. -> 10 m/sec

Question 57. Ball ‘a’ of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball ‘b’ on the table. if the impact is perfectly elastic, the velocity of the ball ‘b’ just after impact would be

Zero
5 m/sec
10 m/sec
None of these

Discuss Question

Answer: Option C. -> 10 m/sec

Question 58. Ball ‘a’ of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball ‘b’ on the table. if the impact is perfectly elastic, the velocity of the ball ‘b’ just after impact would be

Zero
5 m/sec
10 m/sec
None of these

Discuss Question

Answer: Option C. -> 10 m/sec

Question 59. ‘μ’ is coefficient of friction. a wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is

μ
2μ
3μ
½μ

Discuss Question

Answer: Option B. -> 2μ

Question 60. ‘μ’ is coefficient of friction. a wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is