NEET Physics: Questions 1380  1385 of 2098
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Question number: 1380
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
Two soap bubbles of radii r _{1} and r _{2} equal to 8 cm and 9 cm are touching each other over a common surface S _{1} S _{2}. Its radius will be
Choices
Choice (4)  Response  

a.  45 cm 

b.  58 cm 

c.  20 cm 

d.  72 cm 

Question number: 1381
» Properties of Solids & Liquids » Elastic Behavior
Question
A brass rod is to support a load of 500 N. If its elastic limit is 5.0 × l0 ^{8 } N/m ^{2} its minimum diameter must be 
Choices
Choice (4)  Response  

a.  3.71mm 

b.  1.13mm 

c.  1.26mm 

d.  2.26mm 

Question number: 1382
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
The deBroglie wavelength of an electron is 0.2 Å. Calculate the potential difference (approximate) required to retard it to rest
Choices
Choice (4)  Response  

a.  3.76 × 10 ^{3} V 

b.  3.76 × l0 ^{3} V 

c.  376.5 V 

d.  3.76 × 10 ^{3} eV 

Question number: 1383
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
Consider two hot bodies B _{1} and B _{2} which have temperature 100° C and 60° C respectively at t = 0. The temperature of surroundings is 50° C. The ratio of the respective rates of cooling R _{1} and R _{2} of these two bodies at t = 0 will be
Choices
Choice (4)  Response  

a.  R _{1}: R _{2} = 4: 5 

b.  R _{1}: R _{2} = 3: 2 

c.  R _{1}: R _{2} = 2: 3 

d.  R _{1}: R _{2} = 5: 1 

Question number: 1384
» Atoms and Nuclei » Hydrogen Spectrum
Question
The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is
Choices
Choice (4)  Response  

a.  27: 5 

b.  5: 27 

c.  4: 1 

d.  1: 4 

Question number: 1385
» Properties of Solids & Liquids » Thermal Expansion
Question
An iron tire is to be fitted on to a wooden wheel 2 m in diameter. The diameter of tire is 4mm smaller than that of wheel. The tire should be heated so that its temperature increases by a minimum of (The coefficient of cubical expansion of iron is 3.6 ×10 ^{5} /°C)
Choices
Choice (4)  Response  

a.  1000°C 

b.  500°C 

c.  167°C 

d.  334°C 
