List of top Science Questions

When two compounds namely sodium chloride and calcium chloride are heated directly, one by one on the flame of a burner, they impart different colours to the flame.
Name the colour imparted by (1) sodium chloride and (2) calcium chloride.
Assertion (A) : A rainbow is an artificial spectrum of white light appearing in the sky after a rain shower.
Reason (R) : The water droplets act like small prisms.
Assertion (A) : Each human trait is influenced by both paternal and maternal DNA.
Reason (R) : As compared to the father, the mother contributes more amount of genetic material to the child.
Assertion (A) : A hormone called abscisic acid inhibits growth in plants.
Reason (R) : The role of auxins is opposite to that of abscisic acid in plants.
The shape of magnetic field lines produced (i) inside a solenoid (ii) around a straight conductor, both carrying current of the same magnitude are, respectively :

The resistance of a wire does not depend on its :

A material used for making heating elements of electrical heating devices should have :
The organism in which an outgrowth on the parent body develops into a new individual is :
Which one of the following metals is malleable and a poor conductor of electricity ?
In the electrolysis of water, if the mass of the gas collected at the anode is $m_a$ and the mass of the gas collected at the cathode is $m_c$, the value of $\frac{m_c}{m_a}$ is :
Which of the following is necessary to obtain nuclear energy?
The maximum value of magnification in a convex mirror is
Out of a combination of resistors, one resistor is removed and it is found that the net resistance has increased. The resistor was connected in
Two appliances rated as (60 W, 200 V) and (40 W, 200 V) are connected across a 100 V supply in a room. The total power consumed is
Which of the following expressions represent(s) electric power in the circuit?
Potential difference is measured by
Which of the following statements is true?
Which of the following substances is a conductor?
Which disease is related to the respiratory system?
Which part of food is digested in the buccal cavity?
Pollen grains are formed in which of the following?
Blood pressure is controlled by which of the following?
The sugar level in blood is controlled by which of the following?
Which is the longest cell in the human body?
In which of the following binary fission does not occur?