Physics Past Questions and Answers

A force F is applied to a body P as shown in the diagram above. If the body moves through a distance, a, which of the following represents the work done?

A Fa
B Fa Cos θ
C \(\frac{Fa}{\cos \theta}\)
D FaSin θ
E \(\frac{Fa}{\sin \theta}\)

Question 222:

In which of these fields are repulsive forces NOT experienced?

I. Magnetic field
II. Gravitational field
III. Electric field

A I only
B II only
C III only
D I and III only
E II and III only

Question 223:

The component of a vector in a given direction is ____________

A Equal to the magnitude of the resultant vector in that direction
B Equal to the magnitude of the resultant vector in the opposite direction
C Its effective magnitude
D Its effective value in that direction
E Its effective value in the opposite direction

Question 224:

A plane which is Inclined at an angle of 30 ° to the horizontal has a velocity ratio of ____________

A 2
B 1
C 0.87
D 0.67
E 0.5

Question 225:

A mass of 5kg is suspended from the ceiling of a lift with a light inextensible string. As the lift moves upwards with an acceleration of 2ms^-2, the tension in the string is [g = 10ms^-2]

A 25N
B 40N
C 50N
D 60N
E 70N