Tiwari Academy Discussion

Nakul jha

Asked: October 29, 2020In: Class 10

(i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? (ii) Suppose the bulb drawn in (i) is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective ?

NCERT Solutions for Class 10 Maths Chapter 15 Important NCERT Questions PROBABILITY NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 9.1 Page No:309 Questions No:17

Nakul jha

Asked: October 29, 2020In: Class 10

A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two-digit number (ii) a perfect square number (iii) a number divisible by 5.

NCERT Solutions for Class 10 Maths Chapter 15 Important NCERT Questions PROBABILITY NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 9.1 Page No:309 Questions No:18

Nakul jha

Asked: October 29, 2020In: Class 10

A game consists of tossing a one rupee coin 3 times and noting its outcome each time. Hanif wins if all the tosses give the same result i.e., three heads or three tails, and loses otherwise. Calculate the probability that Hanif will lose the game.

NCERT Solutions for Class 10 Maths Chapter 15 Important NCERT Questions PROBABILITY NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 9.1 Page No:309 Questions No:23

Bhagyasri Singh

Asked: October 29, 2020In: Class 10

Two customers Shyam and Ekta are visiting a particular shop in the same week (Tuesday to Saturday). Each is equally likely to visit the shop on any day as on another day. What is the probability that both will visit the shop on (i) the same day? (ii) consecutive days? (iii) different days?

Important NCERT Questions PROBABILITY NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 15.2 Page No:311 Questions No:1

Bhagyasri Singh

Asked: October 29, 2020In: Class 10

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.

NCERT Solutions for Class 10 Maths Chapter 15 Important NCERT Questions PROBABILITY NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 15.2 Page No:311 Questions No:3

Bhagyasri Singh

Asked: October 29, 2020In: Class 10

A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find x.

NCERT Solutions for Class 10 Maths Chapter 15 Important NCERT Questions PROBABILITY NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 15.2 Page No:311 Questions No:4

Ekaksh Singh

Asked: October 28, 2020In: Class 10

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

NCERT Solution for Class 10 Science Chapter 15 Our Environment NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-260 Questions No-1

Ekaksh Singh

Asked: October 28, 2020In: Class 10

What is the role of decomposers in the ecosystem?

NCERT Solution for Class 10 Science Chapter 15 Our Environment NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-260 Questions No-2

Ekaksh Singh

Asked: October 28, 2020In: Class 10

Why are some substances biodegradable and some non-biodegradable?

NCERT Solution for Class 10 Science Chapter 15 Our Environment NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-262 Questions No-2

Ekaksh Singh

Asked: October 28, 2020In: Class 10

Give any two ways in which biodegradable substances would affect the environment.

NCERT Solution for Class 10 Science Chapter 15 Our Environment NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-262 Questions No-2

A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two-digit number (ii) a perfect square number (iii) a number divisible by 5.

A game consists of tossing a one rupee coin 3 times and noting its outcome each time. Hanif wins if all the tosses give the same result i.e., three heads or three tails, and loses otherwise. Calculate the probability that Hanif will lose the game.

Two customers Shyam and Ekta are visiting a particular shop in the same week (Tuesday to Saturday). Each is equally likely to visit the shop on any day as on another day. What is the probability that both will visit the shop on (i) the same day? (ii) consecutive days? (iii) different days?

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.

A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find x.

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

What is the role of decomposers in the ecosystem?

Why are some substances biodegradable and some non-biodegradable?

Give any two ways in which biodegradable substances would affect the environment.

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