Q1 Five equal forces of 100N are applied at a point and lying in one plane. If the angle between them is equal, then the resultant force is?
- (a) 10N
- (b) 20N
- (c) `2\sqrt{10}`
- (d) 0 N
- (d) 0 N
Q2 Which one is true about null vector
- (a) It has zero magnitude
- (b) It has no specific direction
- (c) Both a and b
- d) None of the above
- (c) Both a and b
Q3 Minimum number of unequal vectors which can give zero resultant is
- ( a) 2
- (b) 4
- (c) 3
- (d) None of the above
- (c) 3
Q4 The vectors A and B are such that their sum is equal to their difference. The angle between these two vectors will be
- a) `90^{0}`
- b) `0^{0}`
- c) `40^{0}`
- d) `180^{0}`
- a) `90^{0}`
Q5 Dot product of a null vector with any vector is always zero.
- a) True
- b) False
- a) True
Q6 Lami’s Theorem is based on the cosine rule of trigonometry.
- a) True
- b) False
- b) False
Q7 A moves at a speed of 65 km/hr while B who is behind A moves at the speed of 80 km/hr. what is the relative velocity of B w.r.t. A..
- a) 60 km/hr
- b) 80 km/hr
- c) 145 km/hr
- d) 15 km/hr
- d) 15 km/hr Using Formula for relative velocity = VB-VA, 80 – 65 = 15 km/hr
Q8 The rain falling vertically downward with the velocity of 3km/hr. A person moves on a straight road with the velocity of 4 km/hr then the relative velocity of rain w.r.t. person is
- a) 1 km/hr
- b) 5 km/hr
- c) 4 km/hr
- d) 3km/hr
- b) 5 km/hr
Q9. A bus is moving towards east and car is moving toward north with same speed of 50 km/hr. What is the direction of motion of car to the passenger in the bus?
- a) `30^{0}`
- b) `0^{0}`
- c) `60^{0}`
- d) `45^{0}`
- d) `45^{0}`
Q10 A man can protect himself from rain by holding his umbrella at an angle ╬╕ =
- a) `30^{0}`
- b) `0^{0}`
- c) `60^{0}`
- d) None of the above
- d) None of the above
