### MCQs on Physical World and Measurement:

**Ques.** Two forces of 12 *N* and 8 *N* act upon a body. The resultant force on the body has maximum value of

(a) 4 N

(b) 0 N

(c) 20 N

(d) 8 N

**Ques.** A hall has the dimensions 10 m x 12m x 14 m A fly starting at one corner ends up at a diametrically opposite corner. What is the magnitude of its displacement

(a) 17 m

(b) 26 m

(c) 36 m

(d) 20 m

**Ques.** A body moves due East with velocity 20 *km/hour *and then due North with velocity 15 *km/hour.* The resultant velocity

(a) 5 km/hour

(b) 15 km/hour

(c) 20 km/hour

(d) 25 km/hour

**Ques.** A man standing on a road hold his umbrella at 30° with the vertical to keep the rain away. He throws the umbrella and starts running at 10 *km/hr.* He finds that raindrops are hitting his head vertically, the speed of raindrops with respect to the road will be

(a) 10 km/hr

(b) 20 km/hr

(c) 30 km/hr

(d) 40 km/hr

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**Ques.** Following sets of three forces act on a body. Whose resultant cannot be zero

(a) 10, 10, 10

(b) 10, 10, 20

(c) 10, 20, 23

(d) 10, 20, 40

**Ques.** Angular momentum is

(a) A scalar

(b) A polar vector

(c) An axial vector

(d) None of these

**Ques.** The resultant of two vectors *A* and *B* is perpendicular to the vector *A* and its magnitude is equal to half the magnitude of vector *B.* The angle between *A* and *B* is

(a) 120°

(b) 150°

(c) 135°

(d) None of these

**Ques.** Which of the following is a scalar quantity?

(a) Displacement

(b) Electric field

(c) Acceleration

(d) Work

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**Ques.** A particle has displacement of 12 *m* towards east and 5 *m* towards north then 6* m* vertically upward. The sum of these displacements is

(a) 12 m

(b) 10.04 m

(c) 14.31 m

(d) None of these

**Ques.** Surface area is

(a) Scalar

(b) Vector

(c) Neither scalar nor vector

(d) Both scalar and vector

**Ques.** A particle has displacement of 12 *m* towards east and 5 *m* towards north then 6* m* vertically upward. The sum of these displacements is

(a) 12 m

(b) 10.04 m

(c) 14.31 m

(d) None of these

**Ques.** How many minimum number of non-zero vectors in different planes can be added to give zero resultant

(a) 2

(b) 3

(c) 4

(d) 5

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**Ques.** Maximum and minimum magnitudes of the resultant of two vectors of magnitudes *P *and *Q* are in the ratio 3 : 1 Which of the following relations is true

(a) P = 2Q

(b) P = Q

(c) PQ = 1

(d) None of these

**Ques.** Two forces, each of magnitude *F* have a resultant of the same magnitude *F.* The angle between the two forces is

(a) 45°

(b) 120°

(c) 150°

(d) 60°

**Ques.** Dot product of two mutual perpendicular vector is

(a) 0

(b) 1

(c) 2

(d) None of these

**Ques.** How many minimum number of non-zero vectors in different planes can be added to give zero resultant

(a) 2

(b) 3

(c) 4

(d) 5

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**Ques.** Which pair of the following forces will never give resultant force of 2 *N*

(a) 2 N and 2 N

(b) 1 N and 1 N

(c) 1 N and 3 N

(d) 1 N and 4 N

**Ques. **If for two vectors

the vectors

(a) Are perpendicular to each other

(b) Are parallel to each other

(c) Act at an angle of 60°

(d) Act at an angle of 30°

**Ques.** The maximum and minimum magnitude of the resultant of two given vectors are 17 *units* and 7 *unit* respectively. If these two vectors are at right angles to each other, the magnitude of their resultant is

(a) 14

(b) 16

(c) 18

(d) 13

**Ques. **The vector

are perpendicular to each other. The positive value of *a *is

(a) 3

(b) 4

(c) 9

(d) 13

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**Ques.** The resultant of the two vectors having magnitude 2 and 3 is 1. What is their cross product

(a) 6

(b) 3

(c) 1

(d) 0

(a) Zero

(b) Along west

(c) Along east

(d) Vertically downward

Questions 20 was different last time