CBSE 11TH PHYSICS - Online Test

Answer : Option B
Explaination / Solution:

When the stone ll reach at the same point from where is was thrown it ll have same velocity but with opposite sign. 

So  initial velocity u = -20 m/s

Final velocity before hitting ground = v

Distance covered s = 50 m

Acceleration due to gravity a = 9.8 m/s​​​​​​2

We know

v2−u2=2as

=>v2−(−20)2=2×9.8×50

=>v2−400=980

=>v2=1380

=>v=1380−−−−√=±37.1

As this velocity is in opposite direction is initial velocity so sign ll be negative.

v = -37.1 m/s

Answer : Option D
Explaination / Solution:
No Explaination.

Answer : Option B
Explaination / Solution:

Vector addition is the operation of adding two or more vectors together into a vector sum. The so-called parallelogram law gives the rule for vector addition of two or more vectors. For two vectors, the vector sum is obtained by placing them head to tail and drawing the vector from the free tail to the free head.

Answer : Option B
Explaination / Solution:
No Explaination.

Answer : Option C
Explaination / Solution:

W = +ve (Expansion)

Uc−Ua=−veUb−Uc=−vehenceUb−Ua=−veUa−Ub=+ve

ΔQ=ΔU+WΔU=+veW=+veHenceΔQ=+ve

Answer : Option A
Explaination / Solution:

for monoatomic  gas CV = 1.5R, CP =  2.5R

At const volume, 

Q = 500 J

Q=nCVΔT500=1×1.5×8.31(T1−300)T1=340K

At const pressure Q = 500 J

Q=nCPΔT500=1×2.5×8.31(340−T2)T2=316K

Answer : Option D
Explaination / Solution:
No Explaination.

Answer : Option D
Explaination / Solution:
No Explaination.