37) A force of 150 acts on the end of the 900mm about O is

1) 46.2 N , anticlockwise

2) 5.62 N, clock wise

3) 46.2 N clock wise

4) 256 N anticlockwise

**Ans: 46.2 N anticlockwise**

38) An 80 kg block rests on a horizontal plane. A force P of magnitude 535 N gives the block an acceleration of 2.5 m/s^2, to the right. If the coefficient of kinetic friction between the block and the plane is µk =

**0.25**, the normal reaction on the block is1) 600 N

2) 615 N

3) 660 N

4) 800 N

**Ans: 800 N**

39) Moment of inertia of a rectangle of the width 5 cm and height 10 cm about an axis passing through its base is

1) 215 cm^4

2) 512 cm^4

3) 766 cm^4

4) 1667 cm^4

**Ans: 1667 cm^4**

40) The bob of a 2m pendulum describes an arc of a circle in a vertical pane. If the tension in the cord is 2.5 times the weight of the bob the tangential acceleration at is

1) 4.90 m/sec^2

2) 16m/sec^2

3) 2.5 m/sec^2

4) 2 m/sec^2

**Ans: 4.90 m/sec^2**

41)

If Δ = 3 -7 -4 1 -1 2

-3 8 8 7 -8 3

6 -3 -10 then -2 4 -5

is

1) Δ/2

2) –Δ/4

3) –Δ/6

4) Δ/8

**Ans: -Δ/6**

42) The value of [a + b+ c a a+ b ]

1) 3[ a b c]

2) 2[ a b c]

3) [a b c]

4) [ a b c ]^2

**Ans: [a b c]**

43) If St= 1 + 4t^2 is the equation of motion of a particle, its acceleration when velocity vanishes is

1) 0 units

2) 8 units

3) +1 unit

4) – 16 unit

**Ans: 8 units**

44) If there are two children in a family then the probability that there is atleast one girl in the family

1) ¼

2) 2/4

3) ¾

4) 7/8

**Ans: ¾**

45) If A, B, and C are points on the same straight line and the slope of the segment AB is 2/3, then the slope of the segment BC is

1) 3/2

2) 4/9

3)3/4

4) 2/3

**Ans: 4/9**

## 0 comments:

## Post a Comment

Note: only a member of this blog may post a comment.