Question

Please answer these MCQ's 1.Newton's first law of motion is valid only in the absence a-Friction b-Net force2.A string is stretched by two equal opposite force 10N each.The tension in the string is .a-Zero b-20N3.The number of force that can be added by head to tail rule are.a-3b-2c-4d-Any number4.A couple os formed by.a-Two equal and opposite force in same line.b-Two equal and opposite forces not in the same line.5.A body is in equilibrium when its.a-Speed is uniform.b-Speed and acceleration are uniform.6.The alitude of geostationary orbits in which communication satelites are launched above surface of the Earth is.a-6400kmb-42,3007.The work done in lifting a brick of masses 2kg through a height of 5m above ground will be.a-10Jb-100J

Answer 1

1-a 5-b 7-b (not sure about 3;4,6)(3- d.4-a. 6- b) please cross check them and if is there any correction please inform me.

Answer 2

1. Newton's first law of motion is valid only in the absence of

  a. Friction

2. A string is stretched by two equal opposite force 10 N each. The tension in the string is

  b. 20 N

3. The number of force that can be added by head to tail rule are

   d. Any number

4. A couple is formed by

  b. Two equal and opposite forces not in the same line

5. A body is in equilibrium when its

   a. Speed is uniform (as no forces should act when body is in equilibrium)

6. The altitude of geostationary orbits in which communication satellites are launched above surface of the Earth is

    b. 42300 km

7. The work done in lifting a brick of masses 2 kg through a height of 5 m above ground will be

    Work done = F S cos θ = 2 * 5 * cos 180° = -10 J

    a. -10 J