SSLC (English Medium) Class 7 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Make labeled diagram of a candle flame.

Picture based question

Arul and Aakash were doing an experiment in which water was to be heated in a beaker. Arul kept the beaker near the wick in the yellow part of candle flame. Aakash kept the beaker in the outer most part to the flame. Whose water will get heated in a shorter time?

______ is the total number atoms present in one molecule of an element, compound, or a substance.

Assertion (A): We must offer first aid to a bleeding person.
Reason (R): We must not use gloves while helping them.

In which position is the key placed in a circuit?

Name the component of a circuit which help us to start or stop the appliances & safely and easily.

Name the component which connects electrical components to one another.

The rate of evaporation ______ with rising temperature.

Evaporation is a fast process and occurs only at the surface of the liquid.

The rate of evaporation is more when the surface area is greater.

When lemon juice is mixed with soda water, they produce brisk effervescence.

The process of evaporation is not a good technic to separate salt from seawater give a reason.

Assertion (A): Reptiles are warm-blooded animals.
Reason (R): They have scales.

Light travels ______ kilometers per second in air or vacuum. In theory, nothing can travel faster than light.

Materials that allow light to pass through completely are known as ______ material.

Objects that allow light to pass through partially are called ______ material.

Materials that are not able to allow light to pass through, are called ______ material.

Materials that allow light to pass through completely are known as transparent materials.

Define transparent materials. 

Define opaque material.