Physics Exam

16. A loop of 0.1 m wide in diameter is placed in xy-plane in uniform magnetic field of 0.6 T that is perpendicular to the plane of the loop. What is the net magnetic flux through the coil?

A. 9.4 × 10⁻³ Wb
B. 4.7 × 10⁻³ Wb
C. 5.6 × 10⁻² Wb
D. 1.9 × 10⁻² Wb

17. A 12 V voltage source is connected across the primary coil of a transformer having 600 turns. If the secondary coil of a transformer has 1000 turns, what voltage appears across the secondary coil?

A. 20.0 V
B. 12.0 V
C. 7.2 V
D. 72.0 V

18. The following table shows the density of different objects at 20°C.

Substance	Density in kg/m³	Substance	Density in kg/m³
Water	1000	Gold	19300
SeaWater	1025	Bone	1800
Blood	1060	Air	1.29
Gasoline	680	Copper	8920
Ice 0⁰C	916	Iron	7860

Based on the information given in the table, if we identify substances that sink and float with respect to other substance,

A. bone, iron and seawater will sink in water.
B. gasoline, ice and blood floats on the surface of water.
C. gold, blood and copper floats in gasoline.
D. water, gasoline and ice will sink into seawater.

19. Which one of the following statements differentiates emitter, collector and base of a transistor?

A. The collector region is heavily doped as compared with emitter and base.
B. The three parts; emitter, base and collector are equally doped.
C. The base region is heavily doped as compared with base and collector.
D. The emitter region is heavily doped as compared with base and collector.

20. The following figure shows a switch of circuit consisting of a battery source, two switches represented by latter A and B a light bulb Y.

Which one of the following logic get can be represented by equivalent switch circuit?

A. OR get
B. AND get
C. NOR get
D. NAND get

21. What do you call the sound wave that is heard after reflection from a hard surface?

A. Timber
B. Pitch
C. Loudness
D. Echo

22. Which one of the following waves is identified as longitudinal wave?

A. Wave on a vibrating string
B. S-wave of Earthquake
C. Deep water wave
D. Sound wave

23. The angular momentum of a rotating object is defined as the product of its

A. moment of inertia and angular velocity.
B. mass and one-half of the square of the angular velocity.
C. mass and the angular velocity.
D. moment of inertia and the square of the angular velocity.

24. Which of the following statements is correct about the components of the velocity of a ball projected up at an angle of θ with the horizontal? Neglecting the air resistance,

A. the horizontal component of the velocity remains constant throughout its journey.
B. the horizontal velocity of the ball is equal to zero at the maximum height.
C. the vertical component of the velocity remains constant throughout its journey.
D. the vertical component of velocity increases while the horizontal component of velocity decreases.

25. Which one of the following statements is correct about the electric field due to a charged spherical solid conductor?

A. It is non-zero constant inside the sphere.
B. It is parallel to the surface of the sphere.
C. It is zero inside the sphere.
D. It is non-zero constant outside the sphere.

26. A metal wire made of coefficient of linear expansion α is heated so that its temperature is changed by ΔT. If the length of the wire before heating is L₀, which one of the following expressions is correct for the final length of the wire after heating?

A. L₀(1 + α ΔT )
B. L₀ / (1 - α ΔT)
C. L₀ α ΔT
D. L₀ / (1 + α ΔT)

27. What amount of heat energy is required to completely melt 200g of ice at 0 °C? (Take specific latent heat of melting for ice, L_f = 3.3x10⁵ J/kg)

A. Zero
B. 1.65×10³ J
C. 1.65×10⁷ J
D. 6.60 × 10³ J

28. The orbital speed of a satellite at a height of 780 km from the surface of the earth is 7,465 m/s. what is the period of the satellite?

A. 6.60 × 10² s
B. 6.60 × 10³ s
C. 6.04 × 10² s
D. 6.04 × 10³ s

29. An air filled parallel plate capacitor is connected to a potential difference V to store electric charge. If the area of the plates is A and the separation between the plates is d, then the electrical energy stored on the capacitor is

A. ε₀ d V² / A
B. 1/2 ε₀ A V² / d
C. 1/2 ε₀ d V² / A
D. ε₀ A V² / d

30. The charge of 20.0 µC is stored on the capacitor when a potential difference between its two parallel plates is 200.0 V, what is the capacitance of the capacitor?

A. 0.1 µF
B. 4.0 mF
C. 1.0 µF
D. 10.0 µF

Physics Exam

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