1
NEET 2021
MCQ (Single Correct Answer)
+4
-1
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ?
A
4A
B
0.2A
C
0.4A
D
2A
2
NEET 2021
MCQ (Single Correct Answer)
+4
-1
A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of ,

(i) an equilateral tringle of side 'a'

(ii) A square of side 'a'

The magnetic dipole moments of the coil in each case respectively are :
A
4Ia2 and 3Ia2
B
$$\sqrt 3 $$ Ia2 and 3I a2
C
3Ia2 and Ia2
D
3Ia2 and 4Ia2
3
NEET 2021
MCQ (Single Correct Answer)
+4
-1
A particle of mass 'm' is projected with a velocity $$\upsilon $$ = kVe = (k < 1) from the surface of the earth. (Ve = escape velocity)

The maximum height above the surface reached by the particle is :
A
$${{R{k^2}} \over {1 - {k^2}}}$$
B
$$R{\left( {{k \over {1 - {k^2}}}} \right)^2}$$
C
$$R{\left( {{k \over {1 + {k^2}}}} \right)^2}$$
D
$${{{R^2}k} \over {1 + k}}$$
4
NEET 2021
MCQ (Single Correct Answer)
+4
-1
A series LCR circuit containing 5.0 H inductor, 80$$\mu$$F capacitor and 40$$\Omega$$ resistor is connected to 230V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be :
A
42 rad/s and 58 rad/s
B
25 rad/s and 75 rad/s
C
50 rad/s and 25 rad/s
D
46 rad/s and 54 rad/s
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