SSLC (English Medium) कक्षा ९ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Negative acceleration is called ______.

State whether true or false. If false, correct the statement.

Acceleration can get negative value also.

Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction or both of them.

Reason: Acceleration can be produced only by change in magnitude of the velocity. It does not depend the direction.

What do you understand about negative acceleration?

Exercise Problem.

A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?

State Pascal’s law.

Assertion: Pascal’s law is the working principle of a hydraulic lift.

Reason: Pressure is thrust per unit area.

State whether true or false. If false, correct the statement.

Ammeter is connected in parallel in any electric circuit.

______ is used as reflectors in torchlight.

State whether true or false. If false, correct the statement.

When an object is at the centre of curvature of concave mirror the image formed will be virtual and erect.

The radius of curvature of a concave mirror whose focal length is 5cm is ______

Large ______ mirrors are used to concentrate sunlight to produce heat in solar furnaces.

According to cartesion sign convention, which mirror and which lens has negative focal length?

Name the mirror(s) that can give (i) an erect and enlarged image, (ii) same sized, inverted image

Concave mirrors are used by dentists to examine teeth. Why?

Pick out the concave and convex mirrors from the following and tabulate them.

Rear-view mirror, Dentist’s mirror, Torchlight mirror, Mirrors in shopping malls, Make-up mirror.

Ceres is a______.

The period of revolution of planet A around the Sun is 8 times that of planet B. How many times is the distance of planet A as great as that of planet B?

State whether true or false. If false, correct the statement.

Halley’s comet appears after nearly 67 hours.

When we mix a drop of ink in water we get a ______.