CE Physics

17. Which of the following is/are correct?
(1) Volume is a scalar.
(2) Temperature is a vector because it can have negative values.
(3) Energy is a vector because it is related to velocity.

A. (1) only
B. (3) only
C. (1) and (3) only
D. (2) and (3) only


20. 1st statement
When a ball is thrown upwards,its speed reduces 10 m/s every second.
2nd statement
When the thrown ball starts to fall, its speed increases 10 m/s every second.
A.
B.
C.
D.

15.Box X is placed on box Y and the mass of X and that of Y are 3kg and 6 kg respectively.
If all surfaces are smooth, what are the accelerations of X and Y when a force of 18 N applies on Y horizontally?

Acceleration of X Acceleration of Y
A. 2 m s−2 2 m s−2
B. zero 2 m s−2
C. 6 m s−2 3 m s−2
D. zero 3 m s−2

12. A boy climbs up the ladder and a girl walks up the stairs as shown below.Compare their potential energy when the boy and the girl reach the top. Which of the following results is correct?

A. Boy's PE > girl's PE
B. Boy's PE < girl's PE
C. Boy's PE = girl's PE
D. None of the above


18. 1st statement
For a block moving down a slope from rest, we could always find its speed if its vertical distance from the starting point is given.
2nd statement
The law of conservation of energy holds for a block moving down a
slope.
A.
B.
C.
D.