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Important uses of polaroids are as follows—

1. Sun glasses fitted with polaroid sheets protect the eye from glare,

2. Wind shields of automobiles are also made of polaroid sheets,

3. They are useful in three dimensional motion pictures.

Given, x=8secθ and y=8tanθ
=> secθ=x/8 and tanθ=y/8
Now, we know that sec²θ-tan²θ=1
=> (x/8)²-(y/8)²=1
=> x²/64-y²/64=1 -------(1)
on comparing (1) with equation of hyperbola i.e.,
x²/a²-y²/b²=1, we get
a=8 and b=8
Now, eccentricity van be find out as
b²=a²(e²-1)
=> 8²=8²(e²-1)
=> 1=e²-1
=> e=√2
Now, distance between their directrix
=a/e-(-a/e)=a/e+a/e=2a/e
= 2(8/√2)=8√2

Difference between Reflection and Refraction

2X + 3Y → 4I + m.

8 mole of x requires → 3/2 ​× 8 = 12 mole of Y

or 15 moles of Y requires → 2/3 ​× 15 = 10 moles of X

but only 8 moles of X are given so.

(i). X is limiting reagent (which decides product)

(ii). 8 moles of X gives 16I and 4m.

(iii). 3 moles of Y remains unreacted.

Correct option is  C) been / just

Correct option is C) broken

Correct option is A) in

Correct option is A) took off / put on

Correct option is D) turned / inside out

Correct option is D) take in

Correct option is D) had to

 ans- 

had to 

thank u

Correct option is A) take / up

Correct option is B) turned down

Correct option is D) took / in

Correct option is C) so much

Correct option is D) seen / eats

BMI 

The body mass index which is the weight (in kg) divided by the square of the height (in m² ) is the most appropriate mode to measure the body's weight and health conditions. By comparing our BMI with the BMI index we can check whether we are underweight, overweight or normal.

Correct option is B) lock

Lounge area should be clean and without any unpleasant odours. Magazines and newspapers should be kept neatly. Make sure the coffee machines are operational and clean. Offer water to the client and make them comfortable.

Correct option is A) ground

Correct option is D) weight

Correct option is C) rack

#include <iostream>

using namespace std; 

int main() 

{ 

int n,i; 

long fact = 1;

cout<<“Enter a number”;

cout>>n; 

for(i=1;i<=n;i++) 

fact = fact × i; 

cout<<“The factorial of “<<n<<"is"<<"fact;

}

#include<iostream.h>

#include<iomainp.h>

Void main()

{

int n,i,fact=1;

count<<"Enter the number to find its factorial"<<endl;

cin>>n;

for(i=1;i<=n;i++)

fact=fact*i

cout<<"The factorial of"<<n<<"is"fact<<endi;

}

Correct option is C) neither can we

Correct option is C) He / it 

Terephthlaic acid

Correct option is B) wearing

The correct answer is 1803-1805.

C. Treaty of Baris

Sindhia's troops were defeated by General Wellesley at Assaye.

Gandhi believed that at the core of every religion was truth (satya), non-violence (ahimsa) and the Golden Rule. Despite his belief in Hinduism, Gandhi was also critical of many of the social practices of Hindus and sought to reform the religion.

The Treaty between Ranjit Singh and the British was signed at Amritsar.

When did the Cripps Mission, 1942 had practically repeated the August Offer 1940 visit India.

(d) failure of the British to define their war aim

The Treaty of Lahore was signed between the Sikhs and the British in India in the year 1846.

The United East India Company refers to the company in India formed by the Dutch.

Rowlatt after whom Rowlatt Act was named was a Justice.

(d) Aix-la-Chapelle

(a) Bengal and Punjab

(d) Detain a person for any duration without a trial