Question

Assertion  : Isobars are the element having same mass number but different atomic number.

Reason      : Neutrons and protons are present inside nucleus.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Answer

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

In intrinsic semiconductor at room temperature, number of electrons and holes are

(a) Unequal

(b) Equal

(c) Infinite

(d) Zero

In a triode valve the amplification factor is 20 and mutual conductance is 10–3 mho. The plate resistance is

(a) 2 × 103 W

(b) 4 × 103 W

(c) 2 ×104 W

(d) 2 ×104 W

Two metal plates having charges Q, -Q face each other at some separation and are dipped into an oil tank. If the oil is pumped out, the electric field between the plates will:
  1. Increase.
  2. Decrease.
  3. Remain the same.
  4. Become zero.
A narrow beam of white light goes through a slab having parallel faces.
  1. The light never splits in different colours.
  2. The emergent beam is white.
  3. The light inside the slab is split into different colours.
  4. The light inside the slab is white.
Two batteries of emf $\in_1$ and $\in_2(\in_2>\in_1)$ and internal resistances r1 and r2 respectively are connected in parallel as shown in Fig.

Ultraviolet rays coming from sun are absorbed by:

In the circuit shown in figure the maximum output voltage V0 is

(a) 0 V

(b) 5 V

(c) 10 V

(d)  

The electric field between the plates of a parallel plate capacitor when connected to a certain battery I  . If the space between the plates of the capacitor is filled by introducing a material of dielectric constant K without disturbing the battery connections, the field between the plates shall be

(a)  

(b)  

(c)  

(d) None of the above

The electrical conductivity of pure germanium can be increased by:

Half-life of a substance is 10 years. In what time, it becomes  th part of the initial amount

(a) 5 years

(b) 10 years

(c) 20 years

(d) None of these