1:   Work done by a centripetal force F for moving a body round a circular path of radius R is
Options:
  1. 2RF
  2. 2RF/pi
  3. RF
  4. zero

Answer: Option 4

Explanation:

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2:   0.1 HP is equal to
Options:
  1. 746 watt
  2. 74.6 watt
  3. 7.46 watt
  4. 7460 watt

Answer: Option 2

Explanation:

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3:   The dimensional formula of work
Options:
  1. MLT-2
  2. M2LT-2
  3. M2L-2T
  4. ML2T-2

Answer: Option 4

Explanation:

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4:   Geostationary satellite
Options:
  1. falls with g towards the earth
  2. has period of 24 h
  3. has equatorial orbit
  4. all the above

Answer: Option 4

Explanation:

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5:   A spring of spring constant 5 X 10^3 N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm, is
Options:
  1. 12.50 Nm
  2. 18.75 Nm
  3. 25 nm
  4. 6.25 Nm

Answer: Option 2

Explanation:

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6:   Which is most elastic
Options:
  1. iron
  2. copper
  3. quartz
  4. wood

Answer: Option 3

Explanation:

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7:   The potential energy of a molecule increases when it is brought to the surface from the interior of a liquid because
Options:
  1. at the free liquid surface gravitational potential energy is more
  2. work has to be done to move a molecule to the surface against the repulsive component of the inter molecular forces
  3. work has to be done to move a molecule to the surface against the attraction from other molecules
  4. none of these

Answer: Option 2

Explanation:

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8:   A wire suspended vertically from one of its ends is stretched by attaching a weight of 200 N to the lower end. The weight stretches the wire by 1 mm. Then the elastic energy stored in the wire is
Options:
  1. 0.2 J
  2. 10 J
  3. 20 J
  4. 0.1 J

Answer: Option 4

Explanation:

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9:   Writing on black board with a piece of chalk is possible by the property of
Options:
  1. adhesive force
  2. cohesive force
  3. surface tension
  4. viscosity

Answer: Option 1

Explanation:

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10:   Write copper, steel, glass and rubber in order increasing coefficient elasticity
Options:
  1. steel, rubber, copper, glass
  2. rubber, glass, copper, steel
  3. rubber, glass, copper, steel
  4. none of these

Answer: Option 3

Explanation:

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Believe there is a great power silently working all things for good, behave yourself and never mind the rest.
-Beatrix Potter