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- Question
A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:
Options- A. both the balls undergo an equal change in momentum
- B. the change in momentum suffered by rubber ball is more than the lead ball
- C. the change in momentum suffered by rubber ball is less than the lead ball
- D. none of the above
- Correct Answer
- the change in momentum suffered by rubber ball is more than the lead ball
- 1. Slow speed of the spindle is necessary in
Options- A. thread cutting
- B. turning a work of larger diameter
- C. turning a hard or tough material
- D. all of these Discuss
- 2. A zinc diffusion process is called
Options- A. galvanising
- B. anodising
- C. parkerising
- D. sherardizing Discuss
- 3. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
Options- A. 0.25 kW
- B. 0.75 kW
- C. 1.75 kW
- D. 3.75 kW Discuss
- 4. A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.
Options- A. Agree
- B. Disagree Discuss
- 5. A basic hole is one whose
Options- A. lower deviation is zero
- B. upper deviation is zero
- C. lower and upper deviations are zero
- D. none of these Discuss
- 6. The cutting fluid mostly used for machining steel is
Options- A. water
- B. soluble oil
- C. dry
- D. heavy oils Discuss
- 7. Which of the following iron exist between 910° C and 1403° C?
Options- A. ?-iron
- B. ?-iron
- C. ?-iron
- D. ?-iron Discuss
- 8. The loss of pressure head in case of laminar flow is proportional to
Options- A. velocity
- B. (velocity)2
- C. (velocity)3
- D. (velocity)4 Discuss
- 9. The refrigerant carbon dioxide is not widely used because of its __________ power require ments per tonne of refrigeration and high operating pressures.
Options- A. low
- B. high Discuss
- 10. Shrinkage allowance is made by adding to external dimensions and subtracting from internal dimensions.
Options- A. Agree
- B. Disagree Discuss
More questions
Correct Answer: all of these
Correct Answer: sherardizing
Correct Answer: 1.75 kW
Correct Answer: Agree
Correct Answer: lower deviation is zero
Correct Answer: soluble oil
Correct Answer: ?-iron
Correct Answer: velocity
Correct Answer: high
Correct Answer: Agree
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