### JEE Mains (Physics) Physical World and Measurement Questions:

## Physical World and Measurement (JEE Mains Physics)

Question 1 |

If the resultant of the two forces has a magnitude smaller than the magnitude of larger force, the two forces must be

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Point in opposite directions | |

Different both in magnitude and direction | |

Mutually perpendicular to one another | |

Possess extremely small magnitude |

Question 2 |

Any vector in an arbitrary direction can always be replaced by two (or three)

Mutually perpendicular vectors which have the original vector as their resultant | |

Parallel vectors which have the original vector as their resultant | |

It is not possible to resolve a vector | |

Arbitrary vectors which have the original vector as their resultant |

Question 3 |

A boy walks uniformally along the sides of a rectangular park of size 400

*m*× 300*m*, starting from one corner to the other corner diagonally opposite. Which of the following statement is incorrectHis velocity is not uniform throughout the walk | |

His displacement is 500 m | |

His displacement is 700 m | |

He has travelled a distance of 700 m |

Question 4 |

There are two force vectors, one of 5

*N*and other of 12*N*at what angle the two vectors be added to get resultant vector of 17*N*, 7*N*and 13*N*respectively0°, 90° and 180° | |

0°, 90° and 90° | |

0°, 180° and 90° | |

180°, 0° and 90° |

Question 5 |

How many minimum number of coplanar vectors having different magnitudes can be added to give zero resultant

3 | |

5 | |

2 | |

4 |

Question 6 |

A particle is simultaneously acted by two forces equal to 4

*N*and 3*N*. The net force on the particle is5 N | |

7 N | |

1 N | |

Between 1 N and 7 N |

Question 8 |

10 units | |

5 units | |

11 units | |

18 units |

Question 9 |

The vector sum of two forces is perpendicular to their vector differences. In that case, the forces

Are equal to each other in magnitude | |

Are not equal to each other in magnitude | |

Cannot be predicted | |

Are equal to each other |

Question 10 |

Three concurrent forces of the same magnitude are in equilibrium. What is the angle between the forces ? Also name the triangle formed by the forces as sides

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120° equilateral triangle | |

120°, 30°, 30° an isosceles triangle | |

60° equilateral triangle | |

120° an obtuse angled triangle |

Question 11 |

A 150 m long train is moving to north at a speed of 10 m/s. A parrot flying towards south with a speed of 5 m/s crosses the train. The time taken by the parrot the cross to train would be:

8 s | |

15 s | |

10 s | |

30 s |

Question 12 |

Two vector

*A*and*B*have equal magnitudes. Then the vector*A*+*B*is perpendicular toA x B | |

A – B | |

All of these | |

3A – 3B |

Question 13 |

The sum of two forces acting at a point is 16

*N.*If the resultant force is 8*N*and its direction is perpendicular to minimum force then the forces are8 N and 8 N | |

6 N and 10 N | |

2 N and 14 N | |

4 N and 12 N |

Question 14 |

When three forces of 50

*N*, 30*N*and 15*N*act on a body, then the body isMoving with a uniform velocity | |

Moving with an acceleration | |

In equilibrium | |

At rest |

Question 16 |

Two equal forces (

*P*each) act at a point inclined to each other at an angle of 120°. The magnitude of their resultant isP / 4 | |

2P | |

P | |

P / 2 |

Question 17 |

Which of the following is a vector

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None of these | |

Pressure | |

Surface tension | |

Moment of inertia |

Question 18 |

A person goes 10

*km*north and 20*km*east. What will be displacement from initial point2 km | |

5 km | |

20 km | |

22.36 km |

Question 19 |

If a body is in equilibrium under a set of non-collinear forces, then the minimum number of forces has to be

Two | |

Four | |

Five | |

Three |

Question 20 |

Two cars are moving in the same direction with the same speed 30

*km/hr.*They are separated by a distance of 5*km,*the speed of a car moving in the opposite direction if it meets these two cars at an interval of 4 minutes, will be15 km/hr | |

45 km/hr | |

40 km/hr | |

30 km/hr |

There are 20 questions to complete.

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