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

How do submarines sink and float in water?

Differentiate positive & negative buoyant.

Describe the purpose, principle, and working of the Lactometer.

Assertion (A): Lactometer is used to check the purity of milk.
Reason (R): Lactometer measures the cream content of milk.

Assertion (A): A bird perches on a high power line and nothing happens to the bird.
Reason (R): The level of the bird is very high from the ground.

Define the following:

Synaptic signals

Define the following:

Magnetic effect of current

For a plane mirror, magnification m = ______.

Magnification for the convex mirror is ______.

If the angle of incidence i = 0, the angle of reflection r = ______.

A negative sign in the value of magnification indicates that the image is ______.

Assertion: The focal length of the mirror is /and the distance of the object from the focus is V then the magnification of the mirror will be `("f"/"f−u")`

Reason: Magnification = `"image distance"/ "object distance"` = `(-"v"/"u")`

What do you mean by linear magnification?

What is the nature of the image formed by a concave mirror if the magnification produced by the mirror is +4?

How should a ray of light be incident on a rectangular glass slab so that it comes out from the opposite side of the slab without being displaced?

Higher-Order Thinking Skills:

Are the laws of reflection true in the case of irregular reflection?

Sweating causes cooling because water has a ______.

Ice does not melt rapidly because of ______.

A change of state is a change of a substance from ______.

The solid, liquid, and phases of water can coexist in equilibrium at ______.