Question

1) Which one of the following statement about scientific hypothesis is FALSE
b) A scientific hypothesis is an explanation for natural phenomenon.
c)In order to be useful, a scientific hypothesis must be testable in a. way that is replicable by other scientist
d)The previously known outcome of an observation or experienment can be used as solid proof that a newly created scientific hypothesis is absolutely true

2)How does the path of the Sun change with the seasons for an observer located near the North Pole?
b)The maximum altitude of the is higher in the sky during summer
c)The maximum altitude of the inn the sky increases in the autumn
d)The maximum altitude of the in the sky decreases in the spring

4)IN the Northern Hemisphere, an observer at a higher latitude sees more circumpolar stars compared to an observer at a lower latitude, this is because?
a)The North Celestial pole is higher in the sky for an observer at a higher latitude
b)The north celestial pole is lower in the sky for an observer at a higher latitude
c) the zenith is her in the sky for an observer at a higher latitude

5)Choose the correct statement about precession of the Earth's axis?
a) Precession of the Earth's axis of rotation is caused by changes in the shape of the Earth's orbit due only to the gravitational pull of the Sun.
b)After thousands of years, the Earth's spin axis will have drifted away from Polaris and will point in a different direction.
d)Precession of Earth;s rotational axis does not affect the position of Earth's pole star

6)The worse of Earth's gravity pulls down on a snowfaleka s it floats gently toward the ground. What is the "equal and opposite force" during this interaction, according to Newton;s third law?
a)The force of the air pushing up on the snowflake
b)The force of the snowflake gravity pulling up on the Earth
d) there is no equal and opposite force in this case

Answer 1

1) Option D

A scientific hypothesis can be based on previous experiments, that can not be explained with the help of existing theories. But a hypothesis can not be said to be absolutely true, based on previous experiments. Further research and proofs are required to say that the hypothesis is 'absolutely' true.

2) Option B

In north pole, (or any point north of 22.5 degree north latitude, but this is clearly visible in polar region only) the highest position of the sun occur on a day called summer solstice, when the sun is directly above the tropic of cancer. This day, as the name implies, comes in summer.

4) Option A

For an observer in the exact equator, the north celestial pole is in the north horizon (where the sky and earth meet in the north direction) This is the position of the pole star.

As we go closer to the north pole, the position of the polestar rises in the sky, making the the north celestial pole higher. So, more circumpolar stars (stars revolving the polestar) will be visible.

5) Option B

The north direction of earth does not change. But the stars above the poles change their position slowly over time. Presently, the star above the north pole of the earth is the pole star. But after a thousand years, this position will be changed

6) Option B

If gravity is the force pulling down the snow flake, the equal and opposite force is also gravity. The force pulling the snowflake down is the force on the snow flake due to the earth. The reaction force is the force on earth due to the snow flake