Question

Assertion  :   An electric bulb is first connected to a dc source and then to a ac source having the same brightness in both the cases.

Reason    : The peak  value of voltage for an A.C. source is  times the root mean square voltage.

(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 assertion is false but reason is true.

Answer

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

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When the nucleus of a radioactive element emits an alpha particle, the atomic number is decreased by:

Assertion  :   The tyres of aircraft's are slightly conducting.

Reason      : If a conductor is connected to ground, the extra charge induced on conductor will flow to ground.

(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.

Consider a capacitor-charging circuit. Let Q1 be the charge given to the capacitor in a time interval of 10ms and Q2 be the charge given in the next time interval of 10ms. Let 10mC charge be deposited in time interval t1 and another 10mC charge be deposited in the next time interval t2.
  1. Q1 > Q2, t1 > t2
  2. Q1 > Q2, t1 < t2
  3. Q1 < Q2, t1 > t2
  4. Q1 < Q2, t1 < t2
An element X has mass number 10, and number of neutrons = 7. Then what will be the number of proton?

Refractive index of material is equal to tangent of polarising angle. It is called

(a) Brewster’s law

(b) Lambert’s law

(c) Malus’s law

(d) Bragg’s law

Match List I with List II and select the correct answer using the codes given below the lists :

List I

(Position of the object)

List II

(Magnification)

(I) An object is placed at focus before a convex mirror

(A) Magnification is -

(II) An object is placed at centre of curvature before a concave mirror

(B) Magnification is 0.5

(III) An object is placed at focus before a concave mirror

(C) Magnification is +1

(IV) An object is placed at centre of curvature before a convex mirror

(D) Magnification is  -1

 

(E) Magnification is 0.33

Codes :

(a) I-B, II-D, III-A, IV-E

(b) I-A, II-D, III-C, IV-B

(c) I-C, II-B, III-A, IV-E

(d) I-B, II-E, III-D, IV-C

Electric switches and appliances should be tested only with:
One Volt is equal to:
The hysteresis cycle for the material of permanent magnet is:

To get an output 1 from the circuit shown in the figure, the input must be

(a) A = 0, B = 1, C = 0

(b) A = 1, B = 0,  C = 0

(c) A = 1, B = 0, C = 1

(d) A = 1, B = 1, C = 0