Wellcome!

Question 1. Asked on :31 December 2018:01:49:06 PM

#### What is differences between speed and velocity?

 Speed Velocity 1. It is a scalar quantity.2. It is a distance covered in unit time.3. Average speed of moving object can not be zero. 4. Speed of an object can never be zero. 1. It is a vector quantity.2. It is a displacement covered in unit time with direction.3. Average velocity of moving object can be zero. 4. Velocity of an object can be positive, negative or zero.

-Answered by Nishant Verma On 17 October 2019:02:40:37 PM

Question 2. Asked on :31 December 2018:12:06:37 PM

#### Write any three characteristiscs of colloids.

Three characteristics of colloids are -

(i) They do not settle down when left undisturbed, that is, a colloid is quite stable.

(ii) They show tyndall effects.

(ii) Colloidal particles can not be seperated by the process of filteration

-Answered by priyanshu kumar On 03 November 2019:03:15:24 PM

Question 3. Asked on :31 December 2018:09:25:45 AM

#### What is sublimation?

The process in which solids convert directly into gases and gases convert into solid is called sublimation.

-Answered by priyanshu kumar On 03 November 2019:03:15:33 PM

Question 4. Asked on :31 December 2018:09:20:26 AM

#### Find the median of 11, 12, 2x + 2, 3x, 21, 23 where x is the mean of 5, 10, 3.

For finding the value of x first we find mean of 5, 10, 3

sum of observation = 5 + 10 + 3 = 18

mean = 18 / 3 = 6

Therefore, x = 6

Now we have data for median 11, 12, 14, 18, 21, 23

n = 6 { n is an even number}

n/2 th trem = 14

and (n/2 + 1)th trem = 18

Median = (14 + 18)/2 = 32/ 2 = 16 Answer

-Answered by priyanshu kumar On 03 November 2019:03:15:43 PM

Question 5. Asked on :30 December 2018:09:33:16 AM

#### What is common in all acids?

-Added by Pawan Kumar Science » Acid Base Salt

All acids have H+ ions. H+ ion is a chemical properties of acid

-Answered by priyanshu kumar On 03 November 2019:03:15:57 PM

Question 6. Asked on :30 December 2018:12:07:49 AM

#### What is different between Ameter and galvanometer?

-Added by Master Purushottam Science » Electricity

Ameter measures the amount of current in a cunductor while galvanometer detects the current.

-Answered by priyanshu kumar On 03 November 2019:03:16:04 PM

Question 7. Asked on :29 December 2018:02:15:17 AM

#### आपेक्षित घनत्व का मात्रक क्या होता है?

-Added by Apurva Institute Science » घनत्व

प्रायः किसी पदार्थ के घनत्व को पानी के घनत्व की तुलना में व्यक्त करना सुविधजनक होता है।

किसी पदार्थ का आपेक्षिक घनत्व उस पदार्थ का घनत्व व पानी के घनत्व का अनुपात है।

चूँकि आपेक्षिक घनत्व समान राशियों का एक अनुपात है, अतः इसका कोई मात्राक नहीं होता।

-Answered by Prince Rawat On 09 September 2019:01:58:29 PM

Question 8. Asked on :29 December 2018:01:35:07 AM

#### What is galvanometer?

-Added by Apurva Institute Science » Electricity

It is a device to detect current in electric circuit.

-Answered by priyanshu kumar On 03 November 2019:03:13:19 PM

Question 9. Asked on :29 December 2018:01:00:20 AM

#### If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

S7 = 7/2(2a + 6d)

=> 49 = 7a + 21d

=> 7 = a + 3d   ------------ (i)

S17 = 17/2 (2a + 16d)

=> 289 = 17a + 136

=> 17 = a + 8d --------------  (ii)

Substracting equation (i) from (ii)

we have ...

17 - 7 = a - a + 8d - 3d

10 = 5d

d = 10/5

d = 2

Putting the value in Equation (i)

7 = a + 3d

7 = a + 3 x 2

a = 7 - 6

a = 1

Sum of first n terms = n/2 [2a + (n - 1) d]

= n/2 [2x 1 + (n - 1)2]

= n/2 [2 + 2n - 2 ]

= n/2 (2n)

= nxn = n2

-Answered by Harshita Rathore On 26 August 2019:03:25:54 PM

Question 10. Asked on :28 December 2018:11:00:50 PM

#### How many terms of the AP : 9, 17, 25, . . . must be taken to give a sum of 636?

A.p= 9,17,25

a=9

d=17-9

=8

Sum of n terms=n÷2[2a+(n-1)d

636=n÷2[2(9)+(n-1)8]

636=n÷2[18+8n-8]

636=n÷2[10+8n]

1272=10n+8n^2

8n^2+10n-1272=0

2[4n^2+5n-636]=0

4n^2+5n-636=0

4n^2+53n-48n-636=0

n(4n+53)-12(4n+53)=0

(n-12)(4n+53)=0

n-12=0

n=12

12 terms must be given to sum of 636

-Answered by Master Purushottam On 22 August 2019:08:54:23 PM

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