JEE Main Test 122

Result

JEE Main Test 122

Score
-
out of -
Rank
-
out of -

TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

If 5 cos χ + 12 cos y = 13, then the maximum value of 5 sinχ + 12 sin y is

A
12

B
√120

C
√20

D
13

Solution
Question 2
4 / -1

A cylindrical capacitor has charge Q and length L . If both the charge and length of the capacitors are doubled, by keeping other parameters fixed, the energy stored in the capacitor

A
remains same

B
increases two times

C
decreases two times

D
increases four times

Solution
Question 3
4 / -1

The equivalent resistance between points A and B of an infinite network of resistances, each of 1Ω, connected as shown is

A
infinite

B
2Ω

C

D
zero

Solution
Question 4
4 / -1

A battery of emf 2.0 V and internal resistance 0.10 Ω is being charged with a current of 5.0 A. The potential difference between the terminals of the battery is

A
2.0 V

B
2.5 V

C
1.5 V

D
zero

Solution
Question 5
4 / -1

A
1.8 pF

B
45 pF

C
40.5 pF

D
20.25 pF

Solution
Question 6
4 / -1

A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is

A
3 A

B
30 A

C
0.3 A

D
2.4 A

Solution
Question 7
4 / -1

A copper disc of radius 0.1 m is rotated about its centre with 20 rev/s in an uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is

A

B

C
20 π mV

D
10 π mV

Solution
Question 8
4 / -1

If the coefficient of mutual induction of the primary and secondary coils of an induction coil is 5 H and a current of 10 A is cut-off in 5 × 10^-4 s, the emf inducted (in volt) in the secondary coil is

A
5 × 10⁴

B
1 × 10⁵

C
25 × 10⁵

D
5 × 10⁶

Solution
Question 9
4 / -1

The electric field of a plane electromagnetic wave varies with time of amplitude 2 Vm ^-1 propagating along Z-axis. The average energy density of the magnetic field is (in Jm^-3)

A
13.29 × 10^-12

B
8.85 × 10^-12

C
17.72 × 10^-12

D
4.43 × 10^-12

Solution
Question 10
4 / -1

Let C be the circle with centre at (1, 1) and radius 1. If T is the circle centred at (0, k) passing through origin and touching the circle C externally, then the radius of T is equal to

A
√3 / √2

B
√3/2

C
1/2

D
1/4