i and ii only
i, ii and iii only
iii and iv only
iv and v only
iii, iv and v only
Correct answer is B
The advantages of use of mercury in a barometer are :
0.5 msec-1
1.5 msec-1
1 msec-1
2 msec-1
4 msec-1
Correct answer is C
Gun momentum = bullet momentum
5 x v = 0.05 x 100
v = 1 msec-1
An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?
The water level remains the same
there is a drop in the level of water in the glass due to condensation on its outside
the water in the glass overflows
the level of water drops because melted ice occupies less volume
none of the above is correct
Correct answer is A
The law of flotation states that a floating object displaces its own weight of the fluid in which it floats. This implies that no extra volume of water is added as the ice melts.
A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?
60
6
6 x 10-2
6 x 10-3
0.6
Correct answer is C
Strain = \(\frac{\Delta L}{L}\)
Extension produced = 6mm or 0.6cm
Original length = 10cm
= \(\frac{0.6}{10}\)
= 0.06 or 6 x 10\(^{-2}\)
9s
4.5s
6s
7.5s
3s
Correct answer is E
Using the equation of motion
S = ut + \(\frac{1}{2}\)at2
45 = (0 x t) + (\(\frac{1}{2}\) x 10 x t2)
t = 3s