List of top Science Questions

(i) State Ohm's law. What will be the value of current and potential difference at the ends of each resistance in the given circuit?
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(i) Mention any two properties of magnetic field lines.
(ii) What do you understand by the heating effect of electric current? In a heater of resistance \(10 \, \Omega\), a current of \(15 \, \text{A}\) is flowing for 30 minutes. What will be the amount of heat produced in the heater?
(i) Clarify the meaning of power of accommodation of eye lens of human eye. Where is the image formed by the eye lens?
(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?
Which of the following is top carnivore?
Physical factor of ecosystem is:
The technique of producing many plants from a single plant under infection-free condition is called—
Chlorophyll is important
(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
Which of the following is an animal hormone?
Homologous series among the following is:
Unsaturated hydrocarbon from the following is:
A six carbon molecule, Glucose is broken down into a three carbon molecule, Pyruvate. This process takes place:
The bond in diatomic molecule of Nitrogen is:
Dialysis is related to:
Formula for Baking Soda is:
Complete the following chemical equation:
\(\underline{\hspace{2cm}}\) + CO_2 \rightarrow \text{CaCO}_3 + \text{H}_2\text{O}
Match the physical quantities given in Column A with the units given in Column B and choose the correct option:
\[\begin{array}{|c|c|} \hline Column A & Column B \\ \hline \text{(1) Electrical resistivity} & \text{(i) Coulomb} \\ \hline \text{(2) Electric potential difference} & \text{(ii) Watt-hour} \\ \hline \text{(3) Electrical energy} & \text{(iii) Joule per coulomb} \\ \hline \text{(4) Electric charge} & \text{(iv) Ohm-meter} \\ \hline \end{array}\]
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 -
Chemical reaction:
\text{Fe(s) + CuSO}_4\text{(aq)} \rightarrow \text{FeSO}_4\text{(aq)} + \text{Cu(s)}
What type of reaction is this?
Two resistances each of 10 ohm are connected in parallel. A battery of 10 V is connected with this combination. Amount of charge flowing per second will be -
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 -
A lemon placed in a beaker full of water appears larger than its real size, when viewed sideways. The light phenomenon responsible is -