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A heavy uniform chain lies on horizontal table top.If the coeffecient of friction between the chain and the table surface is 0.25,then the maximum friction of the length of the chain that can hang over one edge of the table is

(A)

20 %

(B)

25 %

(C)

35 %

(D)

15 %

Question-2

An air craft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15° .What is the radius of the loop?

(A)

13 x 10^{3} m

(B)

15.2 x 10^{3} m

(C)

13.6 x 10^{3} m

(D)

None of these

Question-3

The rear side of a truck is open and a box of 50 kg mass is placed 5 m away from the rear end.The coefficient of friction between the box and the surface below it is 0.15.On a straight road the truck starts from rest and accelerates at 2 m/s^{2} .At what distance from the starting point does the box fall off the truck ?(g = 10 m/s^{2} )

(A)

10 m

(B)

5 m

(C)

25 m

(D)

20 m

Question-4

A gun of mass 1kg fires a bullet of mass 1g with a velocity of 1ms^{-1}.The recoil velocity of the gun is

(A)

1ms^{-1}

(B)

0.1ms^{-1}

(C)

0.01ms^{-1}

(D)

0.001ms^{-1}

Question-5

When a bullet of mass 5 kg is fired, the impulse on it is 200 Ns. If the mass of the gun is 10 kg, then the recoil velocity of the gun is

(A)

20 ms^{-1}

(B)

2 ms^{-1}

(C)

0.2 ms^{-1}

(D)

0.02 ms^{-1}

Question-6

A rocket with a lift of mass 20,000 kg is blasted upward with an initial acceleration of 5 m/s^{2} .Calculate the initial thrust of the blast.

(A)

3.25 x 10^{5} N

(B)

2.96 x 10^{5} N

(C)

4.35 x 10^{5} N

(D)

1.45 x 10^{5} N

Question-7

A force of 15 Newton acts on a body of weigh 30 Newton. What is the acceleration produced in metres per second?

Take g = 10ms^{-2}.

(A)

15.00

(B)

5.00

(C)

1.50

(D)

0.50

Question-8

A machine gun fires a bullet of mass 40 g with a velocity 1200 m/s.The man holding it can exert a maximum force of 144 N on the gun.How many bullets can he fire per second at the most ?

(A)

one

(B)

four

(C)

two

(D)

three

Question-9

A force of 100 N need to be applied parallel to a smooth inclined plane just to hold a body on it. The angle of inclination of the inclined plane is 300. How much horizontal force need to be applied to do the same?

(A)

50 N

(B)

87 N

(C)

100 N

(D)

115 N

Question-10

A block of 10 kg is pulled at a constant speed on a rough horizontal surface by a force of 20 N.Find the co- effecient of kinetic friction .Given that g = 10 m/s^{2} .

(A)

0.2

(B)

0.5

(C)

0.85

(D)

0.7

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