78. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

A.38 m

B.62.5 m

C.96 m

D.240 m

79. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to

A.25

B.50

C.100

D.250

80. y2 = 9/16 x2-36 is the equation of a 16

A.Cricle

B.Ellipse

C.Parabola

D.Hyperbola

81. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one

A.Ellipse

B.Hyperbola

C.Parabola

D.Circle

82. Which of the following is not the unit of energy

A.Kg-m

B.Kcal

C.Watts

D.Watt hours

83. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal

A.Density of metal can't be determined

B.Metal is twice as dense as water

C.Metal will float in water

D.Metal is twice as dense as unknown fluid

84. The C.G. of a solid hemisphere lies on the central radius

A.At distance 3r/2 from the plane base

B.At distance 3r/4 from the plane base

C.At distance 3r/5 from the plane base

D.At distance 3r/8 from the plane base

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