UPSC Prelims Full Length Test - 71

Consider the following statements:

1. Lightning is caused due to discharge of similar charged clouds
2. Lightning conductor always develops the opposite charges as is the charge in the clouds

Which among the above is / are correct statements?

Which of the following is / are correct statements?

1. When glass rod is rubbed with silk, negative charge develops on silk
2. When Ebonite rod is rubbed with fur, negative charge develops on fur

Select the correct option from the codes given below:

Which among the following appear giving different colours mainly due to the phenomenon of interference?

1. A soap bubble
2. Rainbow
3. Oil slick on wet road

Select the correct option from the codes given below:

A motorboat directed upstream is seen to be at rest from the bank of a river. Which among the following is / are correct statement in this context?

1. In terms of Physics, the engine of the boat is doing work
2. If the engine stops, no work will be done
3. If engine stops, boat will gain kinetic energy

Select the correct option from the codes given below:

Which among the following comparisons of geostationary orbit and geosynchronous orbit is / are correct?

1. Geostationary orbit must be circular, Geosynchronous may not be circular
2. Geostationary orbit must be directly above equator, Geosynchronous orbit is not above equator
3. There is only one Geostationary orbit , while there can be many Geosynchronous orbits

Select the correct option from the codes given below: