73.

74.

75.

76.

77.

78.

Which of the following statement is/are correct about Laws of friction?

@ ‘Frictional force is directly proportional to the normal reaction between contacting
surfaces

(1) Frictional force acts opposite to the direction of motion

(iii) Frictional force is dependent over the area and shape of contacting surfaces
(ಯ) Only (i) and (ii) (B) Only 06) and (iii)
(C) Both (i) and (iii) ൯൬) Allof the above (i), (ii) and (iii)

Which of the following statement is/are correct about centre of gravity?

(i) The centre of gravity of a circle is its centre

(ii) The centre of gravity of a right circular Cone is at a 1/8 distance of from its base

(iii) The centre of gravity of a triangle is at the point where the medians of the triangle

meet
(^) Only (i) and (ii) (B) Only @) and (11)
(C) Both (ii) and (iii) ൯൬) Allof the above (i), (ii) and (iii)

Which of the following statement is/are correct about Centesimal system?

0) This is called British System and in this system, one right angle is divided into 90 equal
parts which are called degrees

(ii) This is called French System and in this system, the right angle is divided into 100
equal parts which are called grades

(iii) In this system, the unit of measuring angles is radian
(A) Only (i) (B) Only Gi)
(C) Only Gii) ൯) All of the above (i), (ii) and (iii)

Find the length of arc of a sector of circle, whose radius is 14 cm and the angle of sector is
90 :
(A) 22cm (B) 11 लाप
(0) 44cm (D) 88cm

Which of the following statement is/are correct about stress?

0) When a material is subjected to two equal and opposite axial pulls, the material tends
to increase in length. The resistance offered against this increase in length is called
tensile stress

(i) When a material is subjected to two equal and opposite axial pushes, the material tends
to decrease in length. The resistance offered against the decrease in length is called
compressive stress

(iii) When a material is subjected to two equal and opposite forces acting tangentially across
the resisting section, the body tends to be sheared off across the cross section. The
stress included is called shear stress

(ಯ) Only (i) and (ii) (B) Only (i) and (iii)
(C) Only Gi) and (iii) ൯) All of the above (i), (ii) and (iii)
If x + y=10 and xy = 24 Find x* + y??
(A) 148 (B) 100
(C) 52 (D) 48
11 210/2028

[P.T.0.]