WBCS Exe. Prelims 2019 Prev. Yr. Paper

An arc of length $121\text{cm}$ subtends an angle of $77^{\circ }$ at the centre of a circle. The radius of the circle is:

The arithmetic mean of the six numbers $9$, $12$, $15$, $18$, $20$, and $22$ is increased by $1$ if the number $15$ is replaced by which of the following numbers?

The total number of spinal nerves present in the human body is:

A bomb is released from a moving aeroplane flying horizontally at a uniform speed. Neglecting air resistance, what path does the bomb appear to follow according to the pilot?

Which of the following elements or elemental chemical compounds is commonly utilized in beauty parlors for the purpose of chemical hair setting?