PHY 102 DEMO EXAM - STUDENTSDASH

Welcome to your PHY 102 DEMO EXAM

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Department

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Level

21) The coulomb force between the two point charges of 10pC and 5pC placed at a distance of 150cm is

A)0.2N

B)0.5N

C) 2N

D) 5N

None

24) which of the following waves can be transmitted through solids, liquids and gases

A) Transverse Wave

B) Electromagnetic Waves

C) Mechanical Waves

D) Longitudinal Waves

None

7) The function of a mirage can be explained by the principles of

D)Lateral inversion

B)Lateral inversion

C) total internal reflection

A)Reversibility of light

None

5) The defects in a simple cell which results in a back emf and increases the internal resistance is known as

C) Depolarization

A) Local Action

B) Oxidation

D) Polarization

None

14) If the superposition occurs phase to phase, the resultant displacement is

B)Zero

A)Small

D)All of the above

C)Large

None

13) Two capacitors 3 and 5 are connected in series, calculate the equivalent capacitance o the capacitors

B)3.48

C) 1.80

A)2.85

D) 1.50

None

4: Awave travels a distance of 40cm in 8 seconds. if the distance between two successive troughs of the wave is 20cm, what is the frequency of the wave?

B)0.4Hz

A)2.5Hz

D)0.4Hz

C)5Hz

None

22) what is the beat frequency of two waves with frequencies of 258Hz and 262Hz

D)260Hz

A)2Hz

B)4Hz

C)8Hz

None

16) When the object is placed at the center of curvature of a conncave mirror, the image is

A)Virtual

C) Magnified

D)Disappears

B)Inverted

None

10.

12) The fical length of a concave mirror is 6cm, if an object 4cm tall is placed 9cm from mirror, find the position of the image?

A)16cm

B)17cm

D)11cm

C)10cm

None

11.

3: If the length of the air column is a close pipe is 45cm when it emittes its first overtone calcaluate the wavelength of the tone produced

22.5cm

A) 120cm

C) 90cm

B) 60cm

None

12.

1: If the wavelength 575mm falls on a double silt and the third order bright fringe is seen at angle of 6.5 what is the separation between the double silt?

B) 10

D) 20

C) 15

A) 50

None

13.

10) Sound waves like every other waves has the following properties except

A) reflection

C)Polarization

B) diffraction

D) refraction

None

14.

19) If the reflective index fromwater to air is 3/4, then from air to water is

B)1.8

C)1.33

D)1.34

A)0.75

None

15.

9) During doppler effect the source moving away from observer causes apparem frequency to

D)All of the aboove

B) Static

C) Decrease

A) Increase

None

16.

8) Which of the following is incorrect about columbs law (i)Fx q1q2 (ii) Fxr^2 (iii) Fx 1/r^2

B )(ii) and (iii)

C) (ii)

A) (i)

D)(iii)

None

17.

None

18.

23) If the frequency of a quitar string is 220Hz what is the frequency of second harmonic

D)830Hz

C)440Hz

B)220Hz

A)210Hz

None

19.

18) If the object is placed 25cm before a convex lens of focal length 20cm, the image position is

B)102cm

C)125cm

A)100cm

D)120cm

None

20.

25) If the power of a lens is -40, its focal length is

A)4m

B)-40m

C)-0.25

D)-25m

None

21.

20) Find the focal length of a mirror whose radius of curvature is 20cm

A)0.75

D)5cm

C)40cm

B)10cm

None

22.

2)The intensity and loudness of a sound wave is related to its

B)Frequency

D) Ampliitude

C)Wavelength

A) Duration

None

23.

11) As sound travels through the air some layers of the air molecules crowd together and are known as

D)Phase

A) rerefraction areas

C) Compression areas

B) Equillibrum areas

None

24.

6) Constructive interference occurs when the part difference between wave from two sources is giving as

C) (n+alpha) 2

D) (n+ alpha)

B) (n alpha)

A) (n + 1/2)alhpa

None

25.

15) One of the following statement about wave is false

A) all waves can be reflected and refracted

D) none of the above

C)all waves can be polarized

B) two close sources, vibrating in phase produces interference

None

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