CBSE Class 8 - Science - Chapter 8 - Cell Structure and Functions (Q and A)

Cell Structure and Functions

Questions and Answers based on NCERT Chapter

Q1: Define Cell 

Answer: Cell is the basic structural and functional unit of life.


Q2: Who was the first person to see the cell?

Answer: Robert Hooke, who was the first person to see the cell, in 1665 observed slices of cork under a simple magnifying device.


Q3: What is cork made up of?

Answer: It is a part of the bark of a tree and is made of dead cells.


Q4: Can we see cells with unaided eye?

Answer: Usually animal and plant cells are so small that these can't be seen by the unaided eye. We need a microscope to observe cells. There are few exceptions like hen's egg cell or ostrich's egg which is made up of one large cell that can be seen by an unaided eye.


Q5: Name the largest cell.

Answer: Ostrich's egg.


Q6: What does "cellula" mean in Latin?

Answer: It means a small chamber.


Q7: Name the scientist who discovered nucleus of the cell?

Answer: Robert Brown

CBSE Class 10 - Maths - Probability - 5 Questions That Your Teacher Can Ask To Confuse You

Probability

5 Questions Your Maths Teacher Can Ask To Confuse You

Q1: A fair coin is tossed twice, find the probability of getting different outcomes of this experiment. What will be the sum of all these probabilities?


Answer: A coin is tossed twice, the sample space (possible outcomes) will be:

S = {HH, HT, TH, TT}

Let A be the event getting two heads then

	Number of Favourable Outcomes for event A		1
P(A) =		=
	Total Number of Outcomes		4

Let B be the event getting first head and then tail (HT) then

	Number of Favourable Outcomes for event B		1
P(B) =		=
	Total Number of Outcomes		4

Let C be the event getting first tail then head (TH) then

	Number of Favourable Outcomes for event C		1
P(C) =		=
	Total Number of Outcomes		4

Let D be the event getting two tails (TT) then

	Number of Favourable Outcomes for event D		1
P(D) =		=
	Total Number of Outcomes		4

Sum of all probabilities P(A) + P(B) + P(C) + P(D) = 4/4 = 1


Q2: Find the probability that a leap year selected randomly will have 53 Sundays? 
(Note: If first two days lands on a Sunday in a leap year it would have 53 Sundays. How to prove?). 

CBSE Class 10 - Maths - Circles (Quiz 2016)

Circles 

MCQs

Q1: A tangent to a circle intersects it at how many points?

(a) 1
(b) 2
(c) 3
(d) none of these


Q2: Both tangents and radii

(a) orignate from the center of a circle.
(b) meet a circle at exactly one point.
(c) are half a circle’s length.
(d) are straight angles.



Q3: A tangent to a circle (center O) drawn from an exterior point to the circle and touches the circle at a point P on the circumference. Which of the following statement is TRUE?

(a) ∠TPO > 90°
(b) ∠TPO = 90°
(c) ∠TPO < 90°
(d) ∠TPO = 180°


Q4: Two concentric circles are of radii 13 cm and 12 cm. What is the length of the chord of the larger circle which touches the smaller circle?

(a) 8 cm
(b) 6 cm
(c) 10 cm
(d) 4 cm


Q5: A parallelogram circumscribing a circle a ____

(a) square
(b) rhombus
(c) rectangle
(d) incircle

CBSE Class 12 - Informatics Practices- Sample Question Paper with Marking Scheme(2016)

CBSE Class 12 - Informatics Practices- Sample Question Paper with Marking Scheme(2016) 

CBSE Class 10 - Maths - 5 Minutes Revision of Probability

Probability

5 Minutes Revision

1. The sample space of an experiment is the set of all possible outcomes of the experiment.


2. The sample space when a coin is tossed three times is

     S  = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}

3. Basic formula to find Probability of an event (E) is

	Number of Favourable Outcomes
P(E) =
	Total Number of Outcomes

4. An event that is not very likely has a probability close to 0.


5. An event that is very likely has a probability close to 1 (100%).


6. If probability of happening an event is x then probability of not happening that event is (1-x).


7. If probability of winning a game is 0.6 then probability of loosing it is (1-0.6) = 0.4

CBSE Class 7 - Maths Quiz (2016)

Maths Quiz

MCQs

Q1: The next two terms of the sequence are:
    7, 14, 28, 56, ...

(a) 72, 96
(b) 112, 224
(c) 96, 192
(d) 72, 144


Q2: The probability of getting a consonant from the word "MISSISIPI" is ________?

(a) 4/9
(b) 5/9
(c) 2/3
(d) 2/9



Q3: A parallelogram has ________

(a) No line of symmetry
(b) One line of symmetry
(c) Two lines of symmetry
(d) Three lines of symmetry



Q4: The measures of an angle supplement to the angle of 70° is ______.

(a) 20°
(b) 110°
(c) 70°
(d) 160°


Q5: Anu wanted to score 26 points in the game of cards, but ends up only 8/3 points. By how many points did she fail short?

(a) 70/3
(b) 16/5
(c) 64/3
(d) 62/5

CBSE Class 12 - Biology- Sample Question Paper with Marking Scheme(2016)

CBSE Class 12 - Biology- Sample Question Paper with Marking Scheme(2016)