SSLC (English Medium) Class 10 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

The value of the ionic product of water at 25°C is ______.

The ion formed by dissolution of H⁺ in water is called ______

Lemon juice has a pH of 2, what is the concentration of H⁺ ions?

Why menstrual cycle does not take place before puberty and during pregnancy?

Read the following passage and answer the question that follows:

Rahini and her parents were watching a television programme. An advertisement flashed on the screen which was promoting the use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such an advertisement.

What is first menstruation called? When does it occur?

Read the following passage and answer the question that follows:

Rahini and her parents were watching a television program. An advertisement flashed on the screen which was promoting the use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such an advertisement.

List out the napkin hygiene measures taken during menstruation?

Read the following passage and answer the question that follows:

Rahini and her parents were watching a television program. An advertisement flashed on the screen which was promoting the use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such an advertisement.

Do you think that Rahini’s objection towards her parents was correct? If so, Why?

What are the phases of the menstrual cycle? Indicate the changes in the ovary and uterus.

The luteal phase of the menstrual cycle is also called the secretory phase. Give reason.

The menstrual cycle ceases during pregnancy.

By convention, the clockwise moments are taken as ______ and the anticlockwise moments are taken as_______.

A 100-watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. Calculate the energy consumed (in kWh) in the month of January.

A torch bulb is rated at 3 V and 600 mA. Calculate it’s

1. power
2. resistance
3. energy consumed if it is used for 4 hours.

What is stellar energy?

Biogas is a fossil fuel.

The gas released from vehicles exhaust are

1. carbon monoxide
2. Sulphur dioxide
3. Oxides of nitrogen

Green house effect refers to ______.

What are the advantages of using biogas?

Al wires are used as electric cables due to their silvery-white colour.

Answer the following question using the data given below:

• Assertion: An uncleaned copper vessel is covered with a greenish layer.
• Reason: copper is not attacked by alkali.