Mark 6
Q.3) Answer the following questions. (any two)
1) Write the three laws given by Kepler.
2) State the principle and working of electric motor.
3) Illustrate Newland's law of octaves with the suitable example.
4) Complete the following types of chemical reaction.
Reaction
Types of reaction.
1) NH3 + HCL - NHACI
2) 2HgO
→ 2Hg+02
3) CuO+H2 -> Cu+H2O
4) Zn+2HCI → ZnCl2+H21
5) CuCl2 +2KI —> Culz+2KCI
6)2CH3OH+2Na.-> 2C2H5ONa+H21
Answers
Answer:
Q- Write the three laws given by Kepler.
Ans- There are actually three, Kepler’s laws that is, of planetary motion: 1) every planet’s orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet sweeps out equal areas in equal times; and 3) the square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit. As it’s the third which is most often used, Kepler’s law usually means Kepler’s third law (of planetary motion).
Q- State the principle and working of electric motor.
Ans- The principle of an electric motor is based on the current carrying conductor which produces magnetic field around it. A current carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.