List of top Questions asked in Jharkhand Polytechnic- 2026

If semi-vertical angle of a cone of radius 7 cm is \(30^{\circ}\), then the curved surface area of the cone (in sq cm) is : (Take \(\pi = \frac{22}{7}\))

During alloy formation if one of the metal is Hg (Mercury), then the alloy is called as:

Protecting steel and iron from rusting by coating them with a thin layer of zinc is called:

At what temperature is gypsum heated to form Plaster of Paris?

Which of the following ore is concentrated by Froth floatation process?

Metal items are tarnished when kept open in air for some time. Silver utensils become blackish, copper utensils become greenish due to corrosion. The gases responsible for this corrosion respectively are:

Why do ionic compounds have high melting points?

Some metal oxides react with acid as well as base to produce salt and water, these are known as amphoteric oxides. The examples of amphoteric oxides are:

Aqua regia is a mixture of concentrated HCl and concentrated \(HNO_3\) in the ratio of ____________ respectively.

Four metals A, B, C and D were taken in five different solutions of silver nitrate, zinc sulphate, copper sulphate and iron sulphate and the observations have been listed below:

Reactivity order of metals A, B, C and D is:

The chemical formula of washing soda is :

How many water molecules does hydrated calcium sulphate contain?

Gold is used in making ornaments because it is :

An element X reacts with oxygen and forms oxide of X which turns red litmus to blue. The element X is a :

Phosphorus is stored in :

When chlorine gas is passed in lime water, it forms chemical compound 'M' (main constituent of bleaching powder) and 'N' (used for bleaching in textile industry). Identify the correct option.

Which of the following is known as 'Slaked Lime'?

Why a mild base like magnesium hydroxide is used during indigestion?

Brine is an :

Match Column-I (Different substances) with Column-II (pH values) and choose the correct option from the codes given below :

Tooth-enamel is made up of :

Which one of the following does not have water of crystallization?

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue?

All of the following acids dissociate completely in water, except :

Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was evolved. The gas was passed through lime water, which turned milky. It was concluded that: