1
Q:

For accurate scientific work, temperatures are often measured by

A) mercury thermometers B) alcohol thermometers
C) platinum resistance thermometers D) thermoelectric thermometers

Answer:   C) platinum resistance thermometers



Explanation:

The resistance of metallic conductors e.g, platinum, increases with rise of  temperature . The increase in temperature results in a decrease of current which can be recorded in a galvanometer if the conductor is included in an electrical circuit. Thus the temperature can be known; platinum resistance thermometer is used generally for accurate scientific work. When two dissimilar metals are joined at the ends, and these ends are subjected to a difference of temperature, a current flows through the metals. Greater the difference of temperature , greater the current. So the curent strength can form the basis for measuring the difference in temperature. And when one of these temperatures is known, we can calculate the other.

Subject: Physics
Q:

What is the noise level of normal conversation?

A) About 60 dB B) About 70 dB
C) About 80 dB D) About 90 dB
 
Answer & Explanation Answer: A) About 60 dB

Explanation:
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3 429
Q:

As an object falls freely its ___________________.

 

A) kinetic energy gets converted into potential energy B) potential energy gets converted into kinetic energy
C) momentum gets converted into gravitational force D) gravitational force gets converted into momentum
 
Answer & Explanation Answer: B) potential energy gets converted into kinetic energy

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0 13204
Q:

Due to an acceleration of 1  m/s2, the velocity of a body increases from 5 m/s to 10 m/s in a certain period. Find the displacement (in m) of the body in  that period.

 

A) 125 B) 37.5
C) 62.5 D) 75
 
Answer & Explanation Answer: B) 37.5

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2 472
Q:

What is measured with the Nephometer?

 

A) volume of rainfall B) Cloud volume and speed
C) Salinity of Sea D) All options are correct.
 
Answer & Explanation Answer: B) Cloud volume and speed

Explanation:
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1 4966
Q:

What is the standard room temperature in Kelvin?

 

A) 98 K B) 198 K
C) 273 K D) 373 K  
 
Answer & Explanation Answer: A) 98 K

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0 3141
Q:

An object, starting from rest, moves with constant acceleration of 4 m/s2. After 8 s, its speed is

A) 16 m/s B) 8 m/s
C) 32 m/s D) 4 m/s
 
Answer & Explanation Answer: C) 32 m/s

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1 356
Q:

1 watt is equal to 1 ____________

 

A) J s-1   B) J s
C) J s-2 D) J
 
Answer & Explanation Answer: A) J s-1  

Explanation:
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2 5368
Q:

A body is initially moving with a velocity of 10 m/s. It undergoes an acceleration of 2 m/s2 for 5 seconds. Find the displacement (in m) of this body in these 5 seconds.

 

A)  25 B)  37.5
C)  50 D)  75
 
Answer & Explanation Answer: D)  75

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0 377