NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1380  1385 of 2142
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
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 
