Workshop Calculations Semester 4 January 2018

Workshop Calculation & Science - Semester IV (Jan 2018)

1. The coefficient of friction μ is equal to:
   a) F/R ✔
   b) F × R
   c) R/F
   d) None of these
2. What will be the coefficient of friction when a force of 30 N is required to move a mass of 5 kg?
   a) 0.0875
   b) 0.8
   c) 0.795
   d) 0.695 ✔
3. When frictional force is equal to applied force, it is known as:
   a) Dynamic friction
   b) Limiting friction ✔
   c) Sliding friction
   d) Rolling friction
4. The property of one surface to oppose motion of another is called:
   a) Force
   b) Friction ✔
   c) Both a & b
   d) None of these
5. The centre of gravity of a cone lies at:
   a) 1/4 height ✔
   b) 1/3 height
   c) 2/3 height
   d) 3/4 height
6. A sheet of negligible thickness is called lamina and its C.G. is called:
   a) Center
   b) Centroid ✔
   c) Mids
   d) Bisectors
7. Which is not the property of temporary magnet?
   a) Strength can be varied
   b) Polarity can be changed
   c) Magnetization can be controlled
   d) N & S poles are always permanent ✔
8. Which one is not the property of magnetic lines of force?
   a) While travelling in same direction attract each other ✔
   b) Behaves like stretched elastic string
   c) They do not cross each other
   d) Pass through all media
9. Which device has temporary magnet?
   a) Solenoids ✔
   b) Loud speakers
   c) Ear phone
   d) Magnetic needle
10. Which insulation has resistance to heat, oil ageing and water?
    a) Rubber
    b) Neoprene artificial ✔
    c) PVC
    d) Plastic
11. Which wire is used as heating element?
    a) Copper
    b) Steel
    c) Brass
    d) Nichrome ✔
12. The resistance of a conductor is calculated by:
    a) R = A × L / ρ
    b) R = ρL / A ✔
    c) R = ρ × L × A
    d) R = ρ × A
13. Which formula represents straight line?
    a) y = mx + c ✔
    b) x = my − c
    c) x = y − c
    d) m = x + y
14. The point of intersection of two axes is called:
    a) 1st quadrant
    b) 2nd quadrant
    c) 3rd quadrant
    d) Origin ✔
15. Midpoint of (36,5) and (6,10) is:
    a) (21, 7.5) ✔
    b) (15, 7.5)
    c) (1, 2.1)
    d) (7.5, 15)
16. ‘Less than type’ and ‘more than type’ are types of:
    a) Class distribution
    b) Cumulative class distribution
    c) Cumulative frequency distribution ✔
    d) Upper limits distribution
17. Arithmetic mean of first ten whole numbers is:
    a) 5.5
    b) 5
    c) 4.5 ✔
    d) 4
18. Which gas is used for gas carburizing?
    a) Acetylene
    b) Hydrogen
    c) Methane ✔
    d) Oxygen
19. Which process is used for heat treatment of crank shaft?
    a) Carburising
    b) Tempering
    c) Case hardening ✔
    d) Nitriding
20. Which is not a carburizing salt?
    a) Sodium carbonate
    b) Sodium sulphate ✔
    c) Sodium cyanide
    d) Barium chloride
21. The ideal gas equation is:
    a) P/T = constant
    b) P/V = constant
    c) PV = constant
    d) PV/T = constant ✔
22. Which law relates volume and temperature at constant pressure?
    a) Charles law ✔
    b) Boyle’s law
    c) Gas law
    d) Pascal law
23. At what temperature gas has no volume?
    a) 273°C
    b) -273°C ✔
    c) 0°C
    d) 100°C
24. If number of observations = 30 and mean = 15, sum =:
    a) 15
    b) 450 ✔
    c) 200
    d) 45
25. A pulley rotating at 500 rpm with dia 52 cm, tensions 50 kg & 25 kg. Power transmitted is:
    a) 2.54 HP ✔
    b) 25.4 HP
    c) 0.454 HP
    d) 4.54 HP