BISE Multan · Class 11 · Physics · 2025 · First Annual · Group 1

Q.No.1

1. 1

   $56.8546$ is rounded off to three significant figures as:

   • (A)

     $56.0$

   • (B)

     $56.8$

   • (C)

     $56.9$

   • (D)

     $57.0$

2. 2

   The S.I. unit of solid angle is:

   • (A)

     Radian

   • (B)

     Steradian

   • (C)

     Revolution

   • (D)

     Degree

3. 3

   If a body is rotating with constant angular velocity, its torque will be:

   • (A)

     Zero

   • (B)

     May be zero

   • (C)

     Constant

   • (D)

     Maximum

4. 4

   The resultant of two force $3\mathrm{N}$ and $4\mathrm{N}$ acting at right angle to each other is:

   • (A)

     $7\mathrm{N}$

   • (B)

     $6\mathrm{N}$

   • (C)

     $1\mathrm{N}$

   • (D)

     $5\mathrm{N}$

5. 5

   Ballistic missiles are useful for:

   • (A)

     Short range

   • (B)

     Intermediate range

   • (C)

     Long range

   • (D)

     All of these

6. 6

   Change in momentum is called:

   • (A)

     Force

   • (B)

     Pressure

   • (C)

     Tension

   • (D)

     Impulse

7. 7

   The consumption of energy by $60$ watt bulb in $2$ seconds is:

   • (A)

     $20\mathrm{J}$

   • (B)

     $120\mathrm{J}$

   • (C)

     $30\mathrm{J}$

   • (D)

     $0.02\mathrm{J}$

8. 8

   If orbital velocity of a satellite is $\mathrm{30,000}\mathrm{k}\mathrm{m}{\mathrm{h}}^{-1}$, its orbit will be:

   • (A)

     Parabolic

   • (B)

     Circular

   • (C)

     Elliptical

   • (D)

     Hyperbolic

9. 9

   Which theory is better about gravitation?

   • (A)

     Einstein

   • (B)

     Plank

   • (C)

     Newton

   • (D)

     Michelson

10. 10

    Water is flowing through a pipe under constant pressure. At some place, the pipe becomes narrow. The pressure of water at this place:

    • (A)

      Increases

    • (B)

      Decreases

    • (C)

      Remains same

    • (D)

      None of these

11. 11

    The wave-form of S.H.M. is:

    • (A)

      Square wave

    • (B)

      Sawtooth wave

    • (C)

      Random wave

    • (D)

      Sine wave

12. 12

    Radar is an application of:

    • (A)

      Beats

    • (B)

      Interference

    • (C)

      Doppler effect

    • (D)

      Echo

13. 13

    If a string of length "$\mathrm{\ell }$" vibrates in $n$ loops, the wavelength of stationary waves produced will be:

    • (A)

      $\frac{2\mathrm{\ell }}{n}$

    • (B)

      $\frac{n\mathrm{\ell }}{2}$

    • (C)

      $\frac{\mathrm{\ell }}{2n}$

    • (D)

      $\frac{n}{2\mathrm{\ell }}$

14. 14

    The fringe spacing in double slit experiment increases if we use:

    • (A)

      Yellow light

    • (B)

      Green light

    • (C)

      Blue light

    • (D)

      Red light

15. 15

    The final image formed by simple microscope is:

    • (A)

      Virtual and inverted

    • (B)

      Virtual and erect

    • (C)

      Real and erect

    • (D)

      Real and inverted

16. 16

    In an adiabatic process, the entropy of the system:

    • (A)

      Increases

    • (B)

      Decreases

    • (C)

      Remains same

    • (D)

      First increase then decreases

17. 17

    Temperature difference between source and sink is ${200}^{\circ }\mathrm{C}$. Their temperature difference in Kelvin scale will be:

    • (A)

      $173\mathrm{K}$

    • (B)

      $200\mathrm{K}$

    • (C)

      $273\mathrm{K}$

    • (D)

      $373\mathrm{K}$