Matter in Our Surroundings — Science STD 9 — Question

The _________ force is responsible for providing the necessary centripetal force to planets moving around the Sun.

Which of the following situations involves the Newton's second law of motion?

1. A force can stop a lighter vehicle as well as a heavier vehicle which are moving.
2. A force can accelerate a lighter vehicle more easily than a heavier vehicle which are moving.
3. A force exerted by a lighter vehicle on collision with a heavier vehicle results in both the vehicles cor to a standstill.
4. A force exerted by the escaping air from a balloon in the downward direction makes the balloon to go upwards.

Work done is said to be positive when a force causes displacement:

1 W. S = ________?

Dermal tissue is derived from:

Which is not a function of epidermis?

Nucleolus is a seat of:

When both crops and livestock are raised on the same farm, it is known as:

1. Mixed farming.
2. Mixed cropping.
3. Intercropping.
4. Crop rotation.

The mean radius of the earth's orbit round the sun is 1.5 × 10¹¹. The mean radius of the orbit of mercury round the sun is 6 × 10¹⁰ m. The mercury will rotate around the sun in:

In the Pila, the gastropod mollusk, the organ of the locomotion is:

1. Mantle.
2. Foot.
3. Tentacles.
4. Legs.