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Let cost of book=b Pen=p This means... 5p+7b=410. ...(1). ×7 7p+5b=334. ...(2). ×5 49p+35b=2338 25p+35b=2050 By elimination method , we have P=12(cost of one pen) Therefore, Cost of 4 pens =4×p =4×12 =84 ans.

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When an incident ray makes an angle of 40c with a normal to the air glass interface of the rectangular glass slab. The value of angle of emergence is- (a) 30° (b) 60° (c) 90° (d) 40°

Posted by Rohit Kumar 4 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Raghavi Pattar 4 years, 1 month ago

40 because angle of incidence is equal to angle of emergence ....

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Ripandeep Kaur 4 years, 1 month ago

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Parth Chaturvedi 4 years, 1 month ago

40 as I and e are equal (angles)

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When an incident ray makes an angle of 40c with a normal to the air glass interface of the rectangular glass slab. The value of angle of emergence is- (a) 30c (b) 60c (c) 90c (d) 40c

Posted by Rohit Kumar 4 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Ripandeep Kaur 4 years, 1 month ago

40c

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5 project page from the chapter diary of anne frank class 10

Posted by Prabaht Sharma 4 years, 1 month ago

CBSE > Class 10 > English Language and Literature

1 answers

Raja Dwivedi 4 years, 1 month ago

Give me your assiement

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Sustainable development

Posted by Sonu Pal 4 years, 1 month ago

CBSE > Class 10 > सामाजिक विज्ञान

1 answers

Saurav Singh 4 years, 1 month ago

Those development which is done without harming enviroanment called sustinable development

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Anyone know class10 term-1 board syllabus of all subject pls....tell me???

Posted by Yaksh Dahiya 4 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Yaksh Dahiya 4 years, 1 month ago

Pls tell me

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Rathin Md 4 years, 1 month ago

Ss i now

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Explain the various myths about entrepreneurship

Posted by Raj Thakur 4 years, 1 month ago

CBSE > Class 10 > Information Technology (402)

1 answers

Balkar Tari 4 years, 1 month ago

Answer

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Who was lord Bryon?

Posted by Jatin Kushwaha 4 years, 1 month ago

CBSE > Class 10 > Social Science

5 answers

Shravi Nikode 4 years, 1 month ago

He was an English poet who organised funds and went to fight in the war for the independence of Greece where he died of fever in 1824.

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Trupti Toke 4 years, 1 month ago

He was an English poet

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Ripandeep Kaur 4 years, 1 month ago

He was an English poet who organised funds and went to fight in the war for the independence of Greece

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Niroj Kumar 4 years, 1 month ago

English poet

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Anagha R 4 years, 1 month ago

English poet

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Ocean contain volume of water

Posted by Hari.M Sudan 4 years, 1 month ago

CBSE > Class 10 > Social Science

2 answers

Lakshay Jawla 4 years, 1 month ago

70percent

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Niroj Kumar 4 years, 1 month ago

About 70 percent

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Make a project showing consumption and conservation of resources in your locality.

Posted by August Tripathi 4 years, 1 month ago

CBSE > Class 10 > Social Science

0 answers

ANSWER

show that the mirror formula for spherical mirror also holds good for a plane mirror too....pls answer ??? pls....

Posted by Yaksh Dahiya 4 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Anushka Tyagi 4 years, 1 month ago

Using mirror formula 1 v + 1 u = 1 f 1v+1u=1f For plane mirror f = ∞ Hence 1 v + 1 u = 0 1v+1u=0 So, v = -u It means the image is at equal distance and in opposite side of object. This is the true condition in image formation through plane mirror. Hence spherical mirror formula holds equally to a plane mirror

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Find the position,nature and size of the image of an object 4cm high placed at a distance 10cm from a concave mirror of focal length 20cm

Posted by Yaksh Dahiya 4 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Tanya Bharti 4 years, 1 month ago

height of object= 4cm Object distance = -10cm Focal length. = -20cm Using, 1/f =1/V +1/U -(1/20)= 1/V -1/10 1/V = -1/20 + 1/10 1/V. = (-1+2)/20 1/V. = 1/20 v. = 20 cm m =-v/u = -20/-10 = 2 •°•The image formed is Virtual, Erect and magnified. Also, m= hi/ho 2=hi/4 •°•hi = 8 cm

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What is relationship between frequency and wavelength and velocity ?

Posted by Arnav Khadke 4 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Saumya Khushlani 4 years, 1 month ago

Wavelenght is inversely proportional to velocity

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Silver is most reactive or least?

Posted by Anupam Bror 4 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Tanya Bharti 4 years, 1 month ago

LEAST

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Parth Chaturvedi 4 years, 1 month ago

Least

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Ria Raj 4 years, 1 month ago

Silver is the least reactive metal

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Karishma Gandhi 4 years, 1 month ago

Least

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Anupam Bror 4 years, 1 month ago

Least

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The sum of 3 numbers in AP is 54 and the product of the extremes is 275 find the number

Posted by Sanju Sanjana 4 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Jab kulhado ki trasha hai bad rahi iska arth

Posted by Payal Payal 4 years, 1 month ago

CBSE > Class 10 > हिंदी ए

0 answers

ANSWER

3.3

Posted by Kanha Kumar 4 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

The molecules of water of crystallization in epsom is?

Posted by Ripandeep Kaur 4 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Laxmi Kumari 4 years, 1 month ago

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Deepak Tiwari 4 years, 1 month ago

Two

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Tanya Bharti 4 years, 1 month ago

Two

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Pratik Kumar 4 years, 1 month ago

1Thank You

Rituraj Pandey 4 years, 1 month ago

1Thank You

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I need the answer key of setrite for class 10th can anyone pls share it ????

Posted by Kratika Agarwal 4 years, 1 month ago

CBSE > Class 10 > French

3 answers

Hardik Dayaramani 4 years ago

Bro mere pas h

4Thank You

Mohit Yadav 4 years, 1 month ago

Kya

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Ritika Yadav 4 years, 1 month ago

Kya

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About rancidity

Posted by Aman Yadav 4 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Harshit Singh 4 years, 1 month ago

Rancidity is the oxidation of fats and oils present in food items. To prevent it you can store them in air tight container

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Laxmi Kumari 4 years, 1 month ago

Water oxygen ke karan rust lag jata hai iron mai usi ko rancidity kahte hai

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Sanjay Yadav 4 years, 1 month ago

Sensibility Ek Aisa process Hai Jiske andar jo hai Ham food Jo Hota Hai vah Kaise Ho Jata Ho Jata Hai Jata Hai sakte hain

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Ripandeep Kaur 4 years, 1 month ago

You can prevent it :- 1 Adding anta-oxtidants 2 Vaccum packing 3 Replacing air with nitrogen 4 Refrigerating of food stuff

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Ripandeep Kaur 4 years, 1 month ago

It's nothing but oxidation of fats and oils present in the food which leads to a bad smell

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If 2x+y=23 and 4x-y=19 then the value of (5y-3x) and (y/x-2) are:

Posted by Kunal Kumar 4 years, 1 month ago

CBSE > Class 10 > Mathematics

3 answers

Tapasya !! 4 years, 1 month ago

By elimination method we have: 2x + y = 23 ...?➡️ 4x - y = 19 ...?➡️ ➡️ 6x = 42 ....? ➡️➡️➡️ From eq.3 we have x = 7 On substituting value of x in any of the eq: (let be in eq.2) 2x + y = 23➡️ {We know, x=7} 2(7)+y = 23➡️ 14+y = 23➡️ y = 23-14➡️ y = 9➡️➡️➡️ Now, we have values of both x and y {x=7; y=9}➡️➡️➡️ Final ques➡️ Find value of (5y-3x) and (y/x-2)➡️➡️➡️ Part-1➡️ 5y-3x {x=7; y=9}➡️ 5(9)-3(7)➡️ 45-21➡️ Ans [24]➡️ ➡️➡️➡️ Part-2➡️ y/x -2 {x=7; y=9)➡️ 9/7 -2➡️ 9/7 -14/7➡️ Ans [-5/7]➡️

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Tapasya !! 4 years, 1 month ago

By elimination method we have: 2x + y = 23 ...?➡️ 4x - y = 19 ...?➡️ ➡️ 6x = 42 ....?➡️➡️➡️➡️➡️➡️From eq.? we have x = 7➡️➡️➡️➡️➡️➡️➡️ On substituting value of x in any of the eq: (let be in eq.?) ➡️➡️➡️➡️➡️➡️ 2x + y = 23 {We know, x=7} 2(7)+y = 23 14+y = 23 y = 23-14 y = 9 ➡️➡️➡️➡️➡️➡️ Now, we have values of both x and y {x=7; y=9} ➡️➡️➡️➡️➡️➡️ Final ques Find value of (5y-3x) and (y/x-2) ➡️➡️➡️➡️➡️➡️ Part-1 5y-3x {x=7; y=9} 5(9)-3(7) 45-21 Ans [24] ➡️➡️➡️➡️➡️➡️ Part-2 y/x -2 {x=7; y=9) 9/7 -2 9/7 -14/7 Ans [-5/7]

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Tapasya !! 4 years, 1 month ago

By elimination method we have: 2x + y = 23 ...1 4x - y = 19 ...2 ➡️ 6x = 42 ....3 From eq.3 we have x = 7 On substituting value of x in any of the eq: (let be in eq.2) 2x + y = 23 {We know, x=7} 2(7)+y = 23 14+y = 23 y = 23-14 y = 9 Now, we have values of both x and y {x=7; y=9} Final ques Find value of (5y-3x) and (y/x-2) Part-1 5y-3x {x=7; y=9} 5(9)-3(7) 45-21 Ans [24] Part-2 y/x -2 {x=7; y=9) 9/7 -2 9/7 -14/7 Ans [-5/7]

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Assertion (A): The compound MgCl₂ will not conduct electricity in solid-state. Reason (R) Movement of ions in ionic compounds is not possible in solid-state.

Posted by Moksh Yadav 4 years, 1 month ago

CBSE > Class 10 > Science