Tissues — Science STD 9 — Question

Which one of the following tissue gives mechanical support to young dicotyledonous stem?

Generally, smaller the cell:

What is the source of centripetal force that a planet requires to revolve around the Sun?

Which of the following has highest relative density:

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

1. Increasing pressure on hydrogen contained in a closed container.
2. Some hydrogen gas leaking out of the container.
3. Increasing the volume of the container of hydrogen gas.
4. Adding more hydrogen gas to the container without increasing the volume of the container.

1. (i) and (ii)
2. (i) and (iv)
3. (ii) and (iii)
4. (ii) and (iv)

On listening to his friend, Amit said “Moon does not work as it goes round our earth”, because:
A: Moon displaces perpendicular to direction of force.
B: No force acts on the moon.
C: Momentum change is non-zero.
Which of the combination is/ are correct?

An iron sphere of mass 10kg has the same diameter as an aluminium sphere of mass 3.5kg. Both the spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

Out of the following, an example of matter which can be termed as fluid is:

Cell arises from pre-existing cell was stated by:

Slope of a velocity-time graph gives: