List of top Science Questions asked in UP Board

(ii) Explain the cleansing action of soap.
Describe the transport in plants and write its importance.
Describe the structure and working method of excretory system of human.
Differentiate between Autotrophic Nutrition and Heterotrophic Nutrition with examples.
Write short notes on: (i) Reflex action
(ii) Lymph
(i) Food chain
(ii) Growth hormone in human.
(ii) Write the pH value of pure water.
(iii)What is the main purpose of earthing an electrical appliance?
(ii) What happens when (write chemical equation only):
\begin{enumerate} \item Ethanol is heated with \(\text{K}_2\text{Cr}_2\text{O}_7\) and concentrated sulphuric acid? \item Ethyl alcohol is heated with glacial acetic acid in presence of conc. \(\text{H}_2\text{SO}_4\)? \item Acetic acid reacts with sodium bicarbonate? \end{enumerate}
(i) Write the applications of the following inorganic compounds:
(a) Plaster of Paris
(b) Bleaching Powder
(c) Sodium Bicarbonate
(i) In how many steps, is impure metal obtained from concentrated sulphide ore?
(i) What happens when (write chemical equation only):
\begin{enumerate} \item Plaster of Paris reacts with water? \item \(\text{NH}_3 (g)\) and \(\text{CO}_2 (g)\) are passed in the solution of saturated aqueous solution of NaCl? \item \(\text{Ca(OH)}_2\) (dry) reacts with \(\text{Cl}_2\) (g) (dry)? \end{enumerate}
(i) Select oxidising and reducing agents with reason in the following reactions:
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(ii) What are the usual colours of the following insulations of the electric supply wires?
(ii) Explain the purification of impure copper by electrolytic method giving a neat diagram.
(i) Explain the importance of using fuse in a household electric circuit.
(iii) State Fleming's left-hand rule.
In the given electric circuit find the current shown by ammeter A.
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(ii) How does an electromagnet differ from a permanent magnet?
Why is tungsten normally used for the construction of filaments of electric bulbs?
(i) State any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends.
(i) Draw a labelled ray diagram to show the formation of a virtual magnified image of an object by a convex lens.
Which of the following is correctly matched?
(i) Explain with the help of labelled ray diagram, the defect of hypermetropia. How is it corrected by a lens?
(ii) A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.