One of the following is a scalar quantity?

A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of its acceleration

The relationship between the coefficient of linear expansion \( \alpha \) and volumetric expansion (\( \gamma \)) is-----------------

A bar magnet is divided into two pieces, which of the following statement is correct?

An object 40 cm high is 30cm from the pin hole camera. If the height of the image formed is 20 cm. What is the distance of the image from the pin height?

Tyres are treaded to?

Consider the wave equation \(y = 5\text{mm} \sin [1\text{cm}^{-1}x - 60\text{s}^{-1}t]\). The wave number is?

Which of these is a derived unit?

A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?