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Recent questions and answers in CBSE XI
Questions
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CBSE XI
CBSE XI
Math
Physics
Chemistry
Biology
What is weight of NaOH present in 250 cc of a 2M Solution ?
cl135748
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 2, 2022
by
meena.clay6
1
answer
Prove the following statement by the principle of mathematical induction :
1
+
5
+
9
+
.
.
.
+
(
4
n
−
3
)
=
n
(
2
n
−
1
)
for all natural numbers
n
.
cbse
class11
ch4
mathematical-induction
exemplar
q16
answered
Feb 3, 2021
by
abdulrahimshafiuyusuf
1
answer
Choose the correct answer for all
n
∈
N
,
3.5
2
n
+
1
+
2
3
n
+
1
is divisible by
cbse
class11
ch4
mathematical-induction
exemplar
q27
answered
Sep 25, 2020
by
apoorva14544
1
answer
State the three steps of sexual cycle in fungi.
class11
biology
sec-c
biological classification
answered
Jun 28, 2020
by
kphasnashirin
2
answers
Discuss how classification systems have undergone several changes over a period of time. Since the dawn of civilization, many attempts have been made to classify organisms.
class11
biology
sec-d
biological classification
answered
Jun 28, 2020
by
kphasnashirin
2
answers
Describe briefly the four major groups of protozoa. The four groups of Protozoa are classified based on their locomotory organs.
class11
biology
sec-d
biological classification
answered
Jun 28, 2020
by
kphasnashirin
2
answers
What is relative mass and charge of an electron?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Feb 17, 2020
by
dashsourav53
1
answer
A stone is shot upwards with a speed of 20 m/s from a tower
200
m
high . The speed with which the stone strikes the ground is approximately .
cbse11
physics
ch2
motion-in-straight-line
answered
Jan 8, 2020
by
aniket.mankar001
2
answers
A ball is thrown vertically upwards from top of tower at
4.9
m
/
s
. It strikes the base of the tower after 3 seconds. The height of tower .
cbse11
physics
ch2
motion-in-straight-line
answered
Jan 8, 2020
by
aniket.mankar001
2
answers
Acceleration of a particle changes when
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 21, 2019
by
meena.clay6
1
answer
A particle has velocity
v
=
2
ˆ
r
+
4
ˆ
j
and acceleration
→
a
=
0.1
ˆ
i
+
0.4
ˆ
j
Find the speed after 10 seconds
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 20, 2019
by
meena.clay6
1
answer
A particle starts with constant acceleration At a time t s speed is found to be 100 m/s and one second later speed becomes 150 m/s. Find the acceleration
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 20, 2019
by
meena.clay6
1
answer
If the velocity of a particle is given by
v
=
(
180
−
15
x
)
1
/
2
. Then its acceleration will be
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 20, 2019
by
meena.clay6
1
answer
The velocity of bullet is reduced from 200 m/s to 100 m/s. While travelling through a wooden block, of thickness 10m.what is the retordation.
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 20, 2019
by
meena.clay6
1
answer
A body starts from rest. What is the ratio of the distance travelled by the body during fourth and 2nd second
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 19, 2019
by
meena.clay6
1
answer
A particle has speed
6.25
m
/
s
is decelerated at sale of given by
d
v
d
t
=
−
2.5
√
v
where v is instantaneous speed. The time taken for the object to come to real is
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 19, 2019
by
meena.clay6
1
answer
The motion of a particle is described by equation
x
=
a
+
b
t
2
where
a
=
15
c
m
,
b
=
3
c
m
/
s
The instantaneous velocity at time 3 will be
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 19, 2019
by
meena.clay6
1
answer
A 210 m long train is moving north at a speed of
25
m
/
s
. A small bird is flying south a little above the train with speed of
5
m
/
s
. The time after which the bird crosses the train is :
cbse11
physics
ch2
motion-in-straight-line
answered
Aug 19, 2019
by
meena.clay6
1
answer
If
P
(
n
)
:
2
n
<
n
!
,
n
∈
N
, then
P
(
n
)
is true for all
n
≥
______ .
cbse
class11
ch4
mathematical-induction
exemplar
q29
answered
Aug 14, 2019
by
s9466813326
1
answer
A body A is projected upward with velocity 98m/s. The second body B is projected with same initial velocity after 4 seconds . Both bodies will meet after
cbse11
physics
ch2
motion-in-straight-line
asked
Jul 29, 2019
by
meena.clay6
0
answers
Consider the motion of the tip of the minute hand of a clock. In one hour
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 29, 2019
by
meena.clay6
1
answer
A body starts from road. What is the ratio of the distance travelled by the body during 4th and 3rd second
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 29, 2019
by
meena.clay6
1
answer
One car is moving on a straight road covers one third of the distance with
20
k
m
/
h
r
and rest with
60
k
m
/
h
r
. The average speed
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 29, 2019
by
meena.clay6
1
answer
Water drops fall at regular interval from tap which is 5 m above the ground . The third drop is leaving the tap at the instant first drop touches the ground . How far above the ground is the second drop at that instant.
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 25, 2019
by
meena.clay6
1
answer
A boy walks to his school at a distance of 6 km with constant speed of 2.5 km/hr and walks both with a constant speed of 4 km/hr . His average speaks for the round trip is
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 25, 2019
by
meena.clay6
1
answer
Two trains each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time of crossing is
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 25, 2019
by
meena.clay6
1
answer
A stone is thrown vertically upwards with a velocity
98
m
/
s
Its velocity will be zero after
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 25, 2019
by
meena.clay6
1
answer
A particle starts from rest with constant acceleration
2
m
/
s
2
. Find the displacement in 5th sec
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 25, 2019
by
meena.clay6
1
answer
Two bodies of different masses say 1 kg and 5 kg are dropped simultaneously a tower. They will reach the ground
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 25, 2019
by
meena.clay6
1
answer
A car moving along a straight highway with speed
126
k
m
/
h
r
is brought to a stop with in a distance of 200 m . ?What is the retardation of the car, and how long does it take for the car to stop .
cbse11
physics
ch2
motion-in-straight-line
answered
Jul 25, 2019
by
meena.clay6
1
answer
A planet is at a distance of
8.427
×
10
8
k
m
from earth. Its angular diameter
=
35.72
″
of an arc. Calculate diameter of planet.
cbse11
physics
ch1
units-and-measurement
answered
Jul 25, 2019
by
meena.clay6
1
answer
If Area(A) , velocity(V) and density
(
ρ
)
are base units , then dimensional formula of force
cbse11
physics
ch1
units-and-measurement
answered
Jul 25, 2019
by
meena.clay6
1
answer
The percentage error in measuring radius of a sphere is found to be
0.05
%
calculate the percentage of error is measuring its volume
cbse11
physics
ch1
units-and-measurement
answered
Jul 25, 2019
by
meena.clay6
1
answer
Magnification of a microscope is 150. A person find the average width of a thread to be 3 mm . what is estimate of thickness of thread
cbse11
physics
ch1
units-and-measurement
answered
Jul 25, 2019
by
meena.clay6
1
answer
Find density of lead if its relative density = 11.3
cbse11
physics
ch1
units-and-measurement
answered
Jul 24, 2019
by
meena.clay6
1
answer
convert 1kg
m
2
s
−
2
into = ______
g
c
m
−
2
S
−
2
cbse11
physics
ch1
units-and-measurement
answered
Jul 23, 2019
by
meena.clay6
1
answer
Find the distance between Quasar (the most distance objects from earth) in km if light takes 3.0 billion year h reach us
cbse11
physics
ch1
units-and-measurement
answered
Jul 23, 2019
by
meena.clay6
1
answer
Error in measurement of length is found to be
0.2
%
what is the error in meaning the volume of a cube .
cbse11
physics
ch1
units-and-measurement
answered
Jul 23, 2019
by
meena.clay6
1
answer
If
d
y
d
x
=
2
e
cos
(
ω
t
+
ϕ
)
the dimensional formula for
(
ω
t
+
ϕ
)
is
cbse11
physics
ch1
units-and-measurement
answered
Jul 23, 2019
by
meena.clay6
1
answer
Algae are known to reproduce asexually by variety of spores under different environmental conditions. Name these spores and the conditions in which they are produced.
class11
biology
sec-d
biological classification
answered
Jul 18, 2019
by
swapnarajan1982
1
answer
State the characteristic features exhibited by Kingdom ANimalia.
class11
biology
sec-c
biological classification
answered
Jul 18, 2019
by
swapnarajan1982
1
answer
Write a note on lichens?
class11
biology
sec-c
biological classification
answered
Jul 18, 2019
by
swapnarajan1982
1
answer
What are bacteriophages? Who discovered them? Name their genetic material. Draw a diagram of TMV.
class11
biology
sec-c
biological classification
answered
Jul 18, 2019
by
swapnarajan1982
1
answer
Name any three parasitic protozoans and mention the disease each of them causes in human beings?
class11
biology
sec-c
biological classification
answered
Jul 18, 2019
by
swapnarajan1982
1
answer
Draw a well labeled diagram of Nostoc.
class11
biology
sec-c
biological classification
answered
Jul 18, 2019
by
swapnarajan1982
1
answer
Name a bacterium that causes each of the following: Citrus canker, Bacterial blight of rice and Crown gall in plants
class11
biology
sec-c
biological classification
answered
Jul 18, 2019
by
swapnarajan1982
1
answer
Draw a well labeled diagram of a bacterial cell.
class11
biology
sec-c
biological classification
asked
Jul 18, 2019
by
swapnarajan1982
1
answer
Fungi are cosmopolitan. Write the role of fungi in your daily life.
class11
biology
sec-c
biological classification
asked
Jul 18, 2019
by
swapnarajan1982
1
answer
At a stage of their cycle, ascomycetes fungi produce the fruiting bodies like apothecium, perithecium or cleistothecium. How are these types of fruiting bodies different from each other?
class11
biology
sec-c
biological classification
asked
Jul 18, 2019
by
swapnarajan1982
1
answer
Why are viruses called obligate intracellular parasites?
class11
biology
sec-b
biological classification
asked
Jul 18, 2019
by
swapnarajan1982
1
answer
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