Free Printable JEE PRACTICE TEST 1 X

1.

Krichhoff's law is in accordance with law of conservation of

a)

charge

b)

current

c)

energy

d)

angular momentum

2.

Kirchhoff's law of junction is also called the law of conservation of

a)

energy

b)

charge

c)

momentum

d)

angular momentum

3.

Wheatstone's bridge cannot be used for measurement of very _______ resistances

a)

high

b)

low

c)

low (or) high

d)

zero

4.

In a balanced wheatstone's network, the resistances in the arms Q and S are interchanged. As a result of these:

a)

galvanometer and the cell must be interchanged to balance

b)

galvanometer shows zero deflection

c)

network is not balanced

d)

network is still balanced

5.

If a galvanometer and battery are interchanged in balanced Wheatstone bridge, then

a)

the battery discharges

b)

the bridge still balances

c)

the balance point is changed

d)

the galvanometer is damaged due to flow of high current

6.

In a Wheatstone's bridge three resistors P,Q,R connected in three arms and the fourth arm is formed by two resistors S_1,S₂ connected in parallel. The conditions for bridge will be

a)

$\frac{P}{Q}=\frac{R}{S_1+S_2}$

b)

$\frac{P}{Q}=\frac{2R}{S_1+S_2}$

c)

$\frac{P}{Q}=\frac{R\left(S_1+S_2\right)}{S_{1_{ }}S_2}$

d)

NONE OF THESE

7.

According to the Krichhoff's law the algebraic sum of the products of current and resistance as well as e.m.f in a closed loop is

a)

zero

b)

greater than zero

c)

less than zero

d)

to be decided by the e.m.f

8.

If n no.of meshes are in an electrical circuit, then the number of independent loop equations will be

a)

n

b)

n-2

c)

n-1

d)

n-3

9.

the Krichhoff's first law $\left(\Sigma i=0\right)$ and second law $\left(\Sigma ir+\Sigma E\right)=0$ , where the symbols have their usual meanings, are respectively based on :

a)

conservation of charge, conservation of momentum

b)

conservation of energy, conservation of charge

c)

conservation of momentum, conservation of charge

d)

conservation of charge, conservation of energy

10.

The physical quantity which remains same in series combination of resistors is _________

a)

Resistance

b)

Current

c)

Potential

d)

All of these

11.

The physical quantity which remains same in parallel combination of resistors is __________

a)

Resistance

b)

Current

c)

Potential

d)

All of these

12.

If 'n' number of equal resistors each of resistance R are connected in parallel then the effective resistance is

a)

$\frac{R}{n}$

b)

$\frac{R}{n^2}$

c)

$nR$

d)

$n+R$

13.

If 'n' number of equal resistors each of resistance R are connected in series then the effective resistance is

a)

$\frac{R}{n}$

b)

$\frac{R}{n^2}$

c)

$nR$

d)

$n+R$

14.

Statement I: In series combination, the current is same in every part of the circuit.

Statement II: In parallel Combination, the potential difference across each resistance is same

a)

Both Statements are true

b)

Both Statements are false

c)

Statement I is true, Statement II is false

d)

Statement I is false, Statement II is true

15.

From the figure, Choose the correct option.

a)

$I_A=I_D$

b)

$I_B=I_C$

c)

$I_A>I_B$

d)

All the above

16.

A current of 2 amperes is flowing through a circular coil of radius 10cm containing 100 turns. The magnetic flux density at the center of the coil is (in wb/m²)

a)

0.126x10^-2

b)

1.26x10^-3

c)

1.26x10^-4

d)

1.26x10^-5

17.

A long straight wire carries an electric current of 2A. The magnetic induction at a perpendicular disctance of 5m from the Wire is $\left(\mu=4\pi x10^{-7\ }Hm^{-1}\right)$

a)

$4\times10^{-8}T$

b)

$8\times10^{-8}T$

c)

both 1 & 2

d)

none of these

18.

for a given distance from a current element, the magnetic induction is maximum at an angle measured with respect to axis of the current carrying conductor is

a)

$\frac{3\pi}{4}$

b)

$\frac{\pi}{4}$

c)

$\frac{\pi}{2}$

d)

$2\pi$

19.

If we double the radius of a current carrying coil keeping the current unchanged, the magnetic field at its Centre is

a)

Becomes four times

b)

Doubled

c)

Remains unchanged

d)

Halved

20.

Two circular coils are made of two identical wires of same length and carry same current. If the number of turns of the two coils are 4 and 2, then the ratio of magnetic induction at the centres will be ______

a)

4:1

b)

2:1

c)

3:1

d)

2:2

JEE PRACTICE TEST 1 X

Total questions: 20

Worksheet time: 10mins

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