NEET TEST SERIES 88 PHYSICS
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1. A ray of light travelling in a transparent medium f refractive index μ, falls on a surface separating the medium from air at an angle of incidence of 45°. For which of the following value of μ the ray can undergo total internal reflection?
a) μ=1.33
b) μ=1.40
c) μ=1.50
d) μ=1.25
Deselect Answer
a)
b)
c)
d)
None
2. The peak voltage of an ac supply is 440 V, then its rms voltage is
a) 31.11V
b) 311.1V
c) 41.11V
d) 411.1V
Deselect Answer
a)
b)
c)
d)
None
3. In series LCR circuit, the phase angle between supply voltage and current is
Deselect Answer
a)
b)
c)
d)
None
4. A metal surface ejects electrons when hit by green light but none when hit by yellow light. The electrons will be ejected when the surface is hit by
a) blue light
b) heat rays
c) infrared light
d) red light
Deselect Answer
a)
b)
c)
d)
None
5. In photoelectric effect, stopping potential depends on
a) frequency of incident light
b) nature of the emitter material
c) intensity of incident light
d) both (a) and (b)
Deselect Answer
a)
b)
c)
d)
None
6. A galvanometer has a resistance 100Ω and gives a full-scale deflection for a current of 0.1 A. It is to be converted into a voltmeter of range of 50 V. The resistance of voltmeter so formed is
a) 400Ω
b) 500Ω
c) 200Ω
d) 80Ω
Deselect Answer
a)
b)
c)
d)
None
7. In an experiment to determine the Young’s modulus of the material of a wire, the length of the wire and the suspended mass are doubled. Then the Young’s modulus of the wire
a) becomes double’s
b) becomes four time
c) remains unchanged
d) becomes half
Deselect Answer
a)
b)
c)
d)
None
8. The refracting angle of the prismis60°.What is the angle of incidence for minimum deviation? The refractive index of material of prism is√2.
a) 45
b) 30
c) 60
d) 50
Deselect Answer
a)
b)
c)
d)
None
9. Three sound sources A, B and C have frequencies 400, 401 and 402HZ, respectively. Calculate the number of beats noted per second.
a) 4
b) 1
c) 2
d) 0
Deselect Answer
a)
b)
c)
d)
None
10. If the kinetic energy of a particle is doubled, by what factor the de Broglie wavelength of the particle increase or decrease?
a) increase by factor 2
b) decrease by factor 2
c) increase by factor 4
d) decrease by factor 4
Deselect Answer
a)
b)
c)
d)
None
11. Identical charges (-q) are placed at each corner of a cube of side b. The electrostatic potential energy of charge (+q) placed at the centre of the cube will be
Deselect Answer
a)
b)
c)
d)
None
12. A negatively charged pendulum is oscillating in a uniform electric field as shown in figure. Its time period of SHM as compared to that when it was uncharged. (mg>qE)
a) Will increase
b) will decrease
c) will not change
d) Will first increase then decrease
Deselect Answer
a)
b)
c)
d)
None
13. In bringing an electron towards another electron, the electrostatic potential; energy of the system
a) decreases
b) increases
c) becomes zero
d) remains the same
Deselect Answer
a)
b)
c)
d)
None
14.
Deselect Answer
a)
b)
c)
d)
None
15. In the nucleus of
11
Na
23
, the number of protons, neutrons and electrons is
a) 11, 12, 0
b) 12, 11, 0
c) 11, 12, 11
d) 12, 11, 11
Deselect Answer
a)
b)
c)
d)
None
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