Work And Energy — Science STD 9 — Question

A 20kg gun fires a bullet of mass 20g with a city of 400m/ s. The action on the shoulder of the person per second by the gun is:

The value of quantity G in the formula for gravitational force:

1. Depends on mass of the earth only.
2. Depends on the radius of earth only.
3. Depends on both mass and radius of earth.
4. Depends neither on mass nor on radius of earth.

Which of the following is not a molecule?

Which of the following atom has a valency of three:

A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time.The upper layer in the separating funnel will be:

Tincture of iodine has antiseptic properties. This solution is made by dissolving:

1. Iodine in potassium iodide.
2. Iodine in acetone.
3. Iodine in water.
4. Iodine in alcohol.

Intracellular compartments are absent in:

Which of these is not related to endoplasmic reticulum?

The growing of ____ crops on a piece of land in a pre-planned succession is known as crop rotation:

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