P-1 Heat — Science STD 10 — Question

Write the characteristics with reference to their classification:
Penguin:

An electric iron is rated at 230V, 750W. Calculate,

1. The maximum current.
2. The number of units of electricity it would use in 30 minutes.

Which hormones are responsible for changes in human body occurring during onset of sexual maturity?

What is meant by ‘unisexual flowers’ and ‘bisexual flowers’ ? Give two examples of each.

State the various characteristics of chemical reactions.

Give an example of characteristics being used to determine how close two species are in evolutionary terms.

When a 12V battery is connected across an unknown resistor, there is a current of 2.5mA in the circuit. Calculate the value of the resistance of the resistor.

According to Newton’s law of gravitation, the earth’s gravitational force is higher on an object of larger mass. Why doesn’t that object fall down with higher velocity as compared to an object with lower mass?

How were the positions of cobalt and nickel resolved in the modern periodic table?

Write two uses of biotechnology related to human health.