List of top Science Questions asked in UP Board X

Common name for \( \text{Na}_2\text{CO}_3 \) is:
Alkali metal among the following is:
Match the compounds given in Column A with their examples in Column B.
Alkali metals are:
The reaction \( \text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2 \) is a:
Focal lengths of both a spherical mirror and a lens are -25 cm. Most probably the mirror and lens are:
A person having normal eye can clearly see an object, if the distance of the object from the eye is:
A light ray passing through the centre of curvature of a concave mirror is incident on the mirror surface. The value of the angle of reflection will be:
In a circuit, keeping potential difference constant, resistance in the circuit is tripled. Current in the circuit will become:
In a house, electricity is supplied at 200 volts. Two electric bulbs of resistance 100 \(\Omega\) and 200 \(\Omega\) are used daily in the house for 1 hour. Daily consumption of electric power is:
In an electrical circuit, three resistances of 2 \(\Omega\), 4 \(\Omega\) and 6 \(\Omega\) are connected in series. A current of 2 A is flowing in the circuit. The potential difference at the ends of these resistances will be in the order:
A light ray passes through a point inside a lens without any deviation. That point of the lens will be its:
What is nutrition? Describe autotrophic and heterotrophic nutrition with suitable examples.
Draw a well labelled diagram of longitudinal section of flower and describe various floral organs.
Describe human male reproductive system with diagram.
Describe the process of sex determination in human beings in detail.
Write atomic number and valency of the following elements: (i) Nitrogen (ii) Magnesium
What do you understand by base and acid? Write two applications of pH in daily life.
Write a property of Plaster of Paris and its two applications.
What do you mean by sustainable management of natural resources? Describe different measures for their conservation and management.
Write down any two applications of a concave mirror. Draw ray diagram for the image formation by a concave mirror when the object is (a) in between infinity and centre of curvature, (b) in between focus and pole of the mirror.
Balance the following equations:
(i) \(\text{Ca(OH)}_2 (aq) + \text{CO}_2 (g) \rightarrow \text{CaCO}_3 (s) + \text{H}_2\text{O} (l)\)
(ii) \(\text{CH}_4 (g) + \text{O}_2 (g) \rightarrow \text{CO}_2 (g) + \text{H}_2\text{O} (l)\)
State Ohm's law. Mention any two factors which affect the resistance of a wire. A bulb of 400 W is connected with an electric source of 200 V. The bulb is used only for five minutes. Find the current flowing in the bulb and the magnitude of heat produced in the bulb.
(i) Write the names of reactants and products for the reaction: \[ \text{Fe} + \text{CuSO}_4 \rightarrow \text{FeSO}_4 + \text{Cu} \downarrow \]
(ii) Give one example of a thermal decomposition reaction (only equation for the reaction).
Mention any two properties of magnetic field lines. Define Maxwell's cork-screw rule for finding direction of magnetic field due to a straight current carrying wire. Depict the magnetic field lines due to a vertical current carrying conductor. Show uniform magnetic field in a given region.