Question

Assertion :   A star which appears blue will be much hotter than the sun

Reason     : It is based on Wien's law

(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

(a) If both assertion and reason are true and the reason is 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

Donor type impurity is found in

(a) Trivalent elements

(b) Pentavalent elements

(c) In both the above

(d) None of these

The only property possessed by ferromagnetic substance is

(a) Hysteresis

(b) Susceptibility

(c) Directional property

(d) Attracting magnetic substances

Which of the following is non-ohmic resistance?

A potential difference of 300 volts is applied to a combination of 2.0mF and 8.0mF capacitors connected in series. The charge on the 2.0mF capacitor is

(a) 2.4

(b) 4.8  

(c) 7.2

(d) 9.6

If the wavelength of light is 4000 Å, then the number of waves in 1 mm length will be

(a) 25

(b) 0.25

(c) 0.25  

(d) 25  

A coil of wire of a certain radius has 600 turns and a self inductance of 108 mH. The self inductance of a 2nd  similar coil of 500 turns will be

(a) 74 mH

(b) 75 mH

(c)  76 mH

(d) 77 mH

Taking the Bohr radius as a0 = 53pm, the radius of Li++ ion in its ground state, on the basis of Bohr’s model, will be about:
An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell

(a) 1.2 Ω

(b) 1.3 Ω

(c) 1.1 Ω

(d) 1.4 Ω

A convex lens of ______ focal length gives a greater magnification than lenses of _______ focal length.