SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

One of the means of indirect transmission of a disease is ______.

______ is a vector of viral disease dengue.

Name the vector of the malarial parasite. Mention the species of malarial parasite which cause malignant and fatal malaria.

Assertion: Dengue can be treated by intake of antibiotics.

Reason: Antibiotics blocks the multiplication of viruses.

What is common to both direct and alternating current?

In India, the frequency of the alternating current is, ______.

The device used to convert AC to DC is called ______.

Define the following:

Frequency

Define the following:

Rectifier

Explain in detail the application of electromagnets.

Unlike magnetic poles ______ whereas like poles ______.

Assertion (A): When 2 long parallel wires, hanging freely are connected in parallel to a battery, they come closer to each other.
Reason (R): Wires carrying current in opposite directions repel each other.

Explain the working of the following device.

Speaker

Explain the working of the following device.

Magnetic levitation trains.

The distance of underwater objects can be deduced by the formula ______.

What is Reverberation?

Why are the roots and walls of the auditorium covered with rough plaster?

What is paper chromatography?

What is a combination reaction?

______ is one of the most important pieces of evidence in crime investigation.