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The inner diameter of a test tube can be measured accurately using a

A. micrometer screw guage
B. pair of dividers
C. metre rule
D. pair of vernier calipers

How much energy is required to heat 7.5kg of ice from -30 to steam at 200C?
A 2497500J
B 3139500J
C 24567000J

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Good morning to all Physics Gurus, it's been long I posted questions on the platform due to my exams, very soon I will constantly posting questions in the room.

If the frequency of an emitted x-ray is 1.6 x 1016Hz, the accelerating potential is?
[e = 1.6 x 10-19C, h = 6.63 x 10-34Js]

A. 6630.0V
B. 663.0V
C. 66.3V
D. 6.6V

A 4kg ball moving at 8m/s collide with a stationary ball of mass 12kg, and they stick together. calculate the final velocity .
A 2 m/s
B 3 m/s
C 4 m/s
D 5m/s

A rockeck of mass 1000kg containing a propellant gas of 3000kg is to be launched vertically. If the fvel is conrumed at the steady rate of 60kg/s calculate the least velocity of the exhaust gases if the rockect and content will just lift off the launching pad immediately after firing A 666.67m/s B 656.67m/s C 661.67m/s D 664.67m/s

A boy of 1.5m height plucked a mango with a bamboo stick, the mango landed on his head after 0.7sec, calculate the height of the mango from the ground.
A 4.95m
B 5.95m
C 2.95m
D 3.95m

A pregnant woman of mass 7.5kg stand on a scale, the scale read the weight of the woman to be 84.3N. Calculate the mass of the foetus in the woman's womb.
A 0.083kg
B 0.93kg
C 0.750k
D 0.11kg