NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1158  1160 of 2184
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Question number: 1158
» Properties of Solids & Liquids » Thermal Expansion
Question
A bimetallic strip is formed out of two identical strips, one of copper and other of brass. The coefficients of linear expansion of the two metals are a _{c} and a _{b}. On heating, the temperature of the strip goes up by ∆T and the strip bends to form an arc of radius of curvature R. Then R is
(1) Inversely proportional to ∆T
(2) Proportional to
(3) Inversely proportional to
(4) Proportional to
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1,2 and 3 are correct 

b.  1 and 3 are correct 

c.  2 and 4 are correct 

d.  1 and 2 are correct 

Question number: 1159
Question
Which statements are incorrect for a zone plate and a lens?
(1) Zone plate has one focus whereas lens has multiple focal lengths
(2) Both zone plate and lens have multi focal lengths
(3) Zone plate has one focus whereas a lens has infinite
(4) Zone plate has multi focal lengths whereas lens has one
Select the correct answers and mark it according to the following codes:
Codes:
Choices
Choice (4)  Response  

a.  1 and 3 are correct 

b.  1 and 2 are correct 

c.  2 and 4 are correct 

d.  1,2 and 3 are correct 

Question number: 1160
» Properties of Solids & Liquids » Elastic Behavior
Question
The lengths and radii of two wires of same material are respectively L, 3L, and 3R, R. Equal weights are applied on then. If the elongations produced in them are l _{1} and l _{2} respectively then their ratio will be
Choices
Choice (4)  Response  

a.  1: 18 

b.  1: 8 

c.  2: 1 

d.  8: 1 
