General Science - MCQ Practice Questions

The phenomenon of senescence in plants is primarily controlled by which hormone?

In photosynthesis, the Z-scheme diagram shows the flow of electrons between which two photosystems?

Which of the following is a chemosynthetic organism commonly found in soil?

The transpiration coefficient (amount of water transpired per unit dry matter produced) is lowest in:

Which structure in plant cells is analogous to the centrosome in animal cells?

The rate of photosynthesis increases with an increase in CO2 concentration until it reaches a plateau. This plateau is called:

Which of the following statements about plasmolysis is TRUE?

A body is thrown vertically upward with a velocity of 40 m/s. What is the maximum height reached? (Take g = 10 m/s²)

Which of the following is NOT a SI base unit?

A car moving at 20 m/s suddenly applies brakes with deceleration of 5 m/s². How far does it travel before stopping?

What is the SI unit of pressure?

A lens has a focal length of 15 cm. What is its power?

An object is placed 30 cm in front of a concave mirror with focal length 10 cm. Where is the image formed?

Which phenomenon explains the formation of a rainbow?

A transformer has 500 turns in primary and 100 turns in secondary coil. If primary voltage is 220V, what is the secondary voltage?

What is the angle of incidence when light ray falls on a plane mirror and the angle of reflection is 35°?

A current-carrying conductor is placed in a magnetic field perpendicular to it. What force acts on it?

Which of the following has the lowest refractive index?

A radioactive element has a half-life of 10 years. After 30 years, what fraction of the original sample remains?

Which statement about elastic collisions is correct?