Q.41)-We always see the same surface of the Moon because-
- It is smaller than the Earth
- It rotates on its axis
- It takes the same time to rotate on its axis and moving around the Earth
- It moves with the same speed at which Earth moves around the Sun
Q.42)-The darkest part of the shadow during eclipse is-
- Halo
- Umbra
- Penumbra
- Black Hole
Q.43)-Low tides are-
- Strong
- Weak
- Moderate
- Very Weak
Q.44)-Which of the following is caused by the combined effects of the gravitational forces exerted by the Moon and the Sun on sea levels?
- Currents
- Runoff
- Tides
- Waves
Q.45)-Tides are caused by the gravitational forces of-
- Of Earth on Moon
- Of Earth on Sun
- Of Sun and Moon on Earth
- Of Moon on Earth
Q.46)-When does tides rise in sea?
- Only on lunar day
- Full Moon and half Moon
- When Moon is on first phase
- Only half Moon
Q.47)-Which of the following celestial body contains Helium-4 in abundance?
- Earth
- Moon
- Venus
- Saturn
Q.48)-The Earth is tilted on its axis-
- 23.5 degree
- 22.5 degree
- 21.5 degree
- 20 degree
Q.49)-In how much time, Earth rotates once on its axis?
- 23 hours 30 minutes
- 23 hours 56 minute 4.9 sec
- 23 hours 10 minute 2 sec
- 24 hours
Q.50)-Day and Night are formed-
- Due to the shape of the orbit of Earth
- Due to the motion of revolution
- Due to the speed of rotation
- None of these