Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice-versa?

An optical illusion which occurs mainly in deserts during hot summer is based on the principle of

At which place earth's magnetic field becomes horizontal?

The speed of a car travelling on a straight road is listed below at successive intervals of 1 s.

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Which of the following is/are correct? The car travels

1. with a uniform acceleration of 2 m/s².

2. 16 m in 4 s.

3. with an average speed of 4 m/s.