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

A horizontal circular loop carries a current that looks clockwise when viewed from above. It is replaced by an equivalent magnetic dipole consisting of a south pole S and a north pole N:
  1. The line SN should be along a diameter of the loop.
  2. The line SN should be perpendicular to the plane of the loop.
  3. The south pole should be slow the loop.
  4. The north pole should be below the loop.
The self-inductance of a solenoid is L. Keeping the length and area same, the number of turns in the coil is increased to two times. The self-inductance of the solenoid will now be-
Mass number is:
The element which was observed in solar spectrum is:

Conditions of diffraction is

(a)

(b)  

(c)  

(d) None of these

Wavelength of which series in hydrogen spectrum lies in visible region ?

Which of the following statement is wrong

(a) Infrared photon has more energy than the photon of visible light

(b) Photographic plates are sensitive to ultraviolet  rays

(c) Photographic plates can be made sensitive to infrared rays

(d) Infrared rays are invisible but can cast shadows like visible light rays

There is no atmosphere on moon because

(a) There is no vegetation

(b) The escape velocity at its surface is very low

(c) Diffusion constant of gases is high

(d) There is vacuum in space

A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of the material is

(a) 4.4  

(b) 2.2  

(c) 1.1  

(d) 0.22  

A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of the magnetic induction at the centre due to the current in the ring is

(a) Proportional to 2(180°  - θ)

(b) Inversely proportional to r

(c) Zero, only if θ = 180°

(d) Zero for all values of θ