List of top Science Questions asked in UP Board X

Write the chemical name, formula, and two main uses of Plaster of Paris.
What is the difference between Roasting and Calcination? Give one example of each.
What is a Redox reaction? Explain with a balanced chemical equation.
Explain the mechanism of Pulmonary Circulation (Double Circulation) in the human heart.
What is the Ozone Layer, and how is it getting depleted?
State Mendel’s Law of Dominance and explain it with a monohybrid cross.
How is the sex of a child determined in humans? Explain using a flow chart.
Define Ohm’s Law and describe an experiment to verify it.
State Fleming’s Left-Hand Rule and explain its application in an electric motor.
Calculate the equivalent resistance of three resistors \( R_1, R_2, R_3 \) connected in parallel.
(i) Food chain
(ii) Growth hormone in human.
A lemon placed in a beaker full of water appears larger than its real size, when viewed sideways. The light phenomenon responsible is -
i) Write balanced equations for the following reactions:
(a) Aluminum + Copper chloride → Aluminum chloride + Copper:
(b) Magnesium + Hydrochloric acid → Magnesium chloride + Hydrogen:
(i) Select oxidising and reducing agents with reason in the following reactions:
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(i) In how many steps, is impure metal obtained from concentrated sulphide ore?
(iii) A refrigerator of 200 W is operated for 10 hours per day. Find out the cost of energy to operate it for 30 days at the rate of ₹6 per kWh.
Range of clear vision of a normal eye is -
An object is placed on the axis of a concave lens of focal length 20 cm. Image is formed at a distance of 30 cm from the lens. The distance of object from lens will be -
Valency of atom C in C_6H_6 is
(i) Show the image formation by a convex mirror by ray diagram when the object is at infinity and
(a) at infinity
(b) in between pole of the mirror and infinity
(ii) Show ray diagram for the refraction of a light ray through a prism and point out the emergent angle and angle of deviation.
Two coils of copper wire are placed closer to each other. Due to change in the value of current in one coil, current starts to flow in the other coil. Reason for this phenomenon is -
(ii) What do you understand by Electrolytic refining? Explain with diagram.
(ii) What is the meaning of magnification produced by a lens? An object of length 5 cm is at a distance of 15 cm from a convex lens. Focal length of the lens is 10 cm. What will be the size of the image?
(ii) Write the pH value of pure water.