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1. A block kept on a rough surface starts sliding when the inclination of the surface is ‘θ’ with respect to the horizontal. The coefficient of static friction between the block and the surface is............
A tan θ
B cos θ
C sec θ
D sin θ
2. Two bodies of masses m1 and m2 are acted upon by a constant force F for a time t. They start from rest and acquire kinetic energies E1 and E2 respectively. Then E1/E2 is
A m2/m1
B 1
C √m1m2/m1m2
D m1/m2

The X and Y components of a force F acting at 30º to x-axis are respectively

4. Spheres of iron and lead having same mass are completely immersed in water. Density of lead is more than that of iron. Apparent loss of weight is W1for iron sphere and W2 for lead sphere. Then W1/W2 is.............
A between 0 and 1
B = 0
C > 1
D = 1
5. A hot body is allowed to cool. The surrounding temperature is constant at 30º C. The body takes time t1 to cool from 90º C to 89º C and time t2 to cool from 60º C to 59.5º C. Then,
A t2 = t1/2
B t2 = 4t1
C t2=t1
D t2=2t1

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