Tissues — Science STD 9 — Question

The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as follows. Which symbol is the correct one?

1. CO
2. AL
3. He
4. So

Rutherford's alpha-particle scattering experiment showed for the first time that an atom has:

A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car:

1. Does not change.
2. Becomes twice that of initial potential energy.
3. Becomes 4 times that of initial potential energy.
4. Becomes 16 times that of initial potential energy.

Algae are characterized by:

1. Pyrenoids.
2. Aquatic habit.
3. Unicellular sex organ.
4. All of the above.

Where are the organelles embedded in a cell?

Rhythmic contraction and relaxation throughout life, are shown by:

Cylindrical muscle fibres which show alternate light and dark bands are:

You are sitting in a stationary car. There is a helium balloon tied to its floor. You accelerate and obviously feel like you are being pushed backwards (against the direction of your accelerations). The balloon.

A force acts between two bodies if:

Identify the correct statement about cells.