### SAT - Science - Physics - Current Electricity

#### Question - 1

If R1 and R2 are respectively the filament resistances of a 200w bulb and a 100w bulb designed to operate on the same voltage.

• A R1 is two times R2
• B R2 is two times R1
• C R1 is four times R2
• D R2 is four times R1

#### Question - 2

Total number of electrons present in 4 A current flowing for Is is

• A $1.25\times10^{23}$
• B $25\times10^{20}$
• C $6\times10^{8}$
• D $2.5\times10^{19}$

#### Question - 3

The current in the branch CDin the circuit shown below will be • A I1+I2
• B I1+I3
• C I2+I3
• D I1-I3

#### Question - 4

The resistance of a metallic wire becomes 8 times when

• A length is doubled
• B length is tripled
• C length is doubled and radius is halved
• D length is halved and radius is doubled

#### Question - 5

In the following figure the current through 4Ω resistor is • A 1.4 A
• B 0.4 A
• C 0.7 A
• D 1.0 A

#### Question - 6

Five identical lamps, each of resistance 1100 Ω are connected to 200 V as shown in the following figure. The reading of an ideal ammeter A is • A $\frac{250}{1100} \times 5A$
• B $\frac{220}{110} \times1A$
• C $\frac{220}{1100} \times 3A$
• D $\frac{220}{1100} \times 2A$

#### Question - 7

The plot represents the flow of current through a wire at 3 different times. The ratio of charges flowing through the wire at different times is • A 2:1:2
• B 1: 3: 3
• C 1: 1: 1
• D 2:3:4

#### Question - 8

Electric intensity is

• A scalar
• B vector
• C neither scalar nor vector
• D sometimes scalar and sometimes vector

#### Question - 9

In Coulomb's law, the constant of proportionality K has units

• A Nm
• B N
• C Nm2/C2
• D NC/m

#### Question - 10

The masses arid lengths of 3 wires of copper are in the ratio 1 : 3 : 5 and 5 : 3 : 1 respectively. The ratio of electrical resistance is

• A 1 : 3 : 5
• B 5 : 3 : 1
• C 125:15:1
• D 1: 125 : 15     