physics test.pdf

In the series combination of two or more than two resistances

• (A) the current through each resistance is same.
• (B) (b) the voltage through each resistance is same.
• (C) (c) neither current nor voltage through each resistance is same.
• (D) (d) both current and voltage through each resis-tance are same.

In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will

• (A) change in previous direction
• (B) not change
• (C) change in opposite direction
• (D) none of these.

12. Which of the following I-V graph represents ohmic conductors?

• (A) option a
• (B) option b
• (C) option c
• (D) option d

Give the number of electrons passing through a wire per minute. The current flowing through it is 500mA.

• (A) 1.875 × 10^20
• (B) b) 6.875 × 10^20
• (C) c) 1.875 × 10^-20
• (D) d) 6.875 × 10^-20

Which of these is a correct definition of conventional current?

• (A) Current that flows from lower potential to higher potential
• (B) Current constituted by the flow of ions
• (C) Current that flows from higher potential to lower potential
• (D) none of the above

7. Identify the dimensional formula of electric current.

• (A) option a
• (B) option b
• (C) option c
• (D) option d

Which type of a physical quantity is electric current?

• (A) vector quantity
• (B) scalar quantity
• (C) Bipolar quantity
• (D) Thermodynamic quantity

7. The emf of a battery is 86V and internal resistance 1 ohms in the figure shown below. Calculate the current drawn from the battery.

• (A) 3A
• (B) 4.5A
• (C) 6A
• (D) 7.2A

6. In the Wheatstone bridge given below, what should be values of R₁ and R2 so that the bridge is balanced?

• (A) a) R1 = 6 ohms; R2 = any finite value
• (B) b) R1 = 6 ohms; R2 = 3 ohms
• (C) c) R1 = 29.4; R2 = 2 ohms
• (D) d) R1 = any finite value; R2 = 3 ohms

6. Calculate resultant resistance between the points A and B in the circuit shown in the figure below.

• (A) 3 ohms
• (B) 2 ohm
• (C) 4.6 ohm
• (D) 2.6ohm