Work And Energy — Science STD 9 — Question

One of the following does not undergo sublimation. This one is:

Animal cell lacking nuclei would also lack in:

Evaporation is a _______ phenomenon.

The latent heat of fusion of ice is:

1. 3.34 × 10⁵J/ kg
2. 22.5 × 10⁵J/ kg
3. 3.34 × 10⁴J/ kg
4. 22.5 × 10⁴J/ kg

A solution of copper oxide was prepared by heating, igniting and precipitation. Which of the following method will give higher ratio of copper oxide:

In a compound, the ratio of the atoms or element by mass remains always the same irrespective of:

Which of the following is true?

P.E of a spring increases when it is in the state of:

Identify the type of force involved in opening the door of refrigerator:

Find out the correct sentence about manure.

1. Manure contains large quantities of organic matter and small quantities of nutrients.
2. It increases the water holding capacity of sandy soil.
3. It helps in draining out of excess of water from clayey soil.
4. Its excessive use pollutes environment because it is made of animal excretory waste.

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