NEET Physics: Questions 1212  1216 of 2142
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Question number: 1212
» Properties of Solids & Liquids » Elastic Behavior
Question
A wire of cross sectional area 4mm ^{2} is just stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 20°C. Coefficient of linear expansion a = 10 ^{5} /°C and Y = 2 × 10 ^{11} N/m ^{2}.
Choices
Choice (4)  Response  

a.  220 N 

b.  120 KN 

c.  160 N 

d.  120 N 

Question number: 1213
» Wave Optics » Young's Double Slit Experiment
Question
The intensity of the light coming from one of the slits in a young’s double slit experiment is double the intensity from the other slit. Find the ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed.
Choices
Choice (4)  Response  

a.  9: 1 

b.  34: 1 

c.  4: 1 

d.  16: 1 

Question number: 1214
» Wave Optics » Wavefront
Question
When a wave of wavelength 0.2 cm is made incident normally on a slit of width 0.004m, then the semiangular width of central maximum of diffraction pattern will be
Choices
Choice (4)  Response  

a.  0° 

b.  30° 

c.  60° 

d.  90° 

Question number: 1215
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
A wall is made up of two layers A and B. The thickness of the two layers is the same, but materials are different. The thermal conductivity of A is double than that of B. In thermal equilibrium the temperature difference between the two ends is 30°C. Then the difference of temperature at the two surfaces of A will be
Choices
Choice (4)  Response  

a.  12°C 

b.  10°C 

c.  24°C 

d.  18°C 

Question number: 1216
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
A film of water is formed between two straight parallel wires of length 15 cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water = 70 × 10 ^{2} N/m)
Choices
Choice (4)  Response  

a.  2.16 × 10 ^{5} Joule 

b.  1.44 × 10 ^{5} Joule 

c.  7.22 × 10 ^{6} Joule 

d.  5.76 × 10 ^{5} Joule 
