Tag: physics

Questions Related to physics

A piece of lead falls from height of $100m$ on a fixed non-conducting slab which brings it to rest. if the specific heat of lead is $30.6 cal/kg ^ \circ C $ the increase in temperature of the slab immediately after collision is  

physics heat - measurement introduction to temperature application of various thermometric scales different types of thermometers

  1. ${6.72^ \circ }C$

  2. ${7.62^ \circ }C$

  3. ${5.62^ \circ }C$

  4. ${8.72^ \circ }C$

Show answer
Correct Option: B

A physicist says "a body contains $10\ joule$ heat" but a physics learner says "this statement is correct only when the body is in liquid state". Mark correct option or options :

physics heat - measurement introduction to temperature application of various thermometric scales different types of thermometers

  1. physicist statement is correct

  2. physics learner's statement is correct

  3. both statements are correct

  4. both statements are wrong

Show answer
Correct Option: D

Two identical rods of a mental are welded in series then 20 cal of heat flows through them in  4 minute. If the rods are welded in parallel then same amount of heat will flow in 

physics heat - measurement introduction to temperature application of various thermometric scales different types of thermometers

  1. 1 minute

  2. 2 minute

  3. 4 minute

  4. 15 minute

Show answer
Correct Option: A
Explanation:

$dq/dt = [(AK)/2x][T2-T1] = 20/4 = 5.$

 $Therefore ( AK/x)(T2-T1) = 10$

When they are one above the other,

$dq/dt = 2Ak/x][T2-T1] =20/t$

Therefore$t = 2\times10  = 20/t$

Therefore$ t = 1 min$

A liter of air at $20^oC$ is heated until both the pressure and the volume are tripled, what is the tempertare then.

physics heat - measurement introduction to temperature application of various thermometric scales different types of thermometers

  1. $2637^oK$

  2. $927^oK$

  3. $200^oK$

  4. $977^oK$

Show answer
Correct Option: A
Explanation:

Applying the formula

$PV=nRT$
$\dfrac { { P } _{ 1 } }{ { V } _{ 1 } } =\dfrac { { P } _{ 2 } }{ { V } _{ 2 } } =\dfrac { { T } _{ 1 } }{ { T } _{ 2 } } $    [$R$ is constant]
Let ${ P } _{ 1 }=P$  and ${ V } _{ 1 }=V$
As given ${ P } _{ 2 }=3P$   ${ V } _{ 2 }=3V$
${ T } _{ 1 }={ 20 }^{ 0 }C=20+2+3=293$
${ T } _{ 2 }=?$
$\dfrac { PV }{ 3P\times 3V } =\dfrac { 293 }{ { T } _{ 2 } } $
$\dfrac { 1 }{ 9 } =\dfrac { 293 }{ { T } _{ 2 } } $
${ T } _{ 2 }=293\times 9=2637$
$\therefore$    New temperature $=2637$.

Each day how many high and low tides are there?

physics gravitation tides movements of ocean and sea water circulation of ocean water

  1. 2 high tides and 2 low tides

  2. 1 high tide and 2 low tides

  3. 2 high tides and 1 low tide

  4. 1 high tide and 1 low tide

Show answer
Correct Option: A
Explanation:

2 low tides and 2 high tides are experienced every lunar day, 

i.e., 24 hours and 50 minutes.

What are known as Spring Tides?

physics gravitation tides movements of ocean and sea water circulation of ocean water

  1. When sun and moon are aligned causes strong high and low tides

  2. When sun and moon are not aligned causes strong high and low tides

  3. When sun and moon are aligned causes only low tides

  4. When sun and moon are not aligned causes only high tides

Show answer
Correct Option: A
Explanation:

Tide with the greatest difference between the high and low tide, 

that occurs just after a new or full moon is a spring tide.

A stone drop from height 'h' reaches at earth surface in 1 sec. If the some stone taken to moon and drop freely from height h then it will reaches at the surface of moon in the time:

physics gravitation tides movements of ocean and sea water circulation of ocean water

  1. $\sqrt { 6 } sec$

  2. 9 sec

  3. $\sqrt { 3 } sec$

  4. 6 sec

Show answer
Correct Option: A

When does spring tides occur?

physics gravitation tides movements of ocean and sea water circulation of ocean water

  1. During full moon and new moon

  2. During quarter moon

  3. Only during full moon

  4. Only during new moon

Show answer
Correct Option: A
Explanation:

Tide with the greatest difference between the high and low tide, that occurs just after a new or full moon is a spring tide.

Offshore, in the deep ocean the difference in tides is usually less than: 

physics gravitation tides movements of ocean and sea water circulation of ocean water

  1. 1.5 feet

  2. 1.6 feet

  3. 1.4 feet

  4. 1.3 feet

Show answer
Correct Option: B
Explanation:

Offshore in the deep ocean the difference in tides is usually less than 1.6 feet. The highest tides can however have a range of 44.6 feet, observed in the Bay of Fundy, Canada.

Tides are not caused by the direct pull of the moon's gravity. Is the statement true or False

physics gravitation tides movements of ocean and sea water circulation of ocean water

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Tides are the result of the gravitation pull of the Moon on the Earth's water body.