All six capacitors shown are identical, Each can withstand maximum 200 volts between its terminals. The maximum voltage that can be safely applied between A and B is
|
(a) 1200 V |
(b) 400 V |
(c) 800 V |
(d) 200 V |
(b) 400 V
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In the circuit shown below, the power developed in the 6W resistor is 6 watt. The power in watts developed in the 4W resistor is
|
(a) 16 |
(b) 9 |
(c) 6 |
(d) 4 |
Assertion : Newton’s rings are formed in the reflected system. When the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is dark.
Reason : The reflection is Newton’s ring cases will be from a denser to a rarer medium and the two interfering rays are reflected under similar conditions.
|
(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. |
A beam of light propagating in medium A with index of refraction n (A) passes across an interface into medium B with index of refraction n(B). The angle of incidence is greater than the angle of refraction; v(A) and v(B) denotes the speed of light in A and B. Then which of the following is true
|
(a) v(A) > v(B) and n(A) > n(B) |
(b) v(A) > v(B) and n(A) < n(B) |
|
(c) v(A) < v(B) and n(A) > n(B) |
(d) v(A) < v(B) and n(A) < n(B) |
If the half life of a radioactive sample is 10 hours, its mean life is
|
(a) 14.4 hours |
(b) 7.2 hours |
(c) 20 hours |
(d) 6.93 hours |
A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to
|
(a) |
(b) p and |
(c) |
(d) p and |
The mean electric energy density between the plates of a charged capacitor is (here q = charge on the capacitor and A = area of the capacitor plate)
|
(a) |
(b) |
(c) |
(d) None of the above |
Biaxial crystal among the following is
|
(a) Calcite |
(b) Quartz |
(c) Selenite |
(d) Tourmaline |
A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 90o |
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 |
