Correct Answer: Nitrogen dioxide

Solution : The correct option is Nitrogen dioxide.

When Lead Nitrate (Pb(NO₃)₂) is heated, it undergoes thermal decomposition. The reaction can be represented as: Pb(NO₃​)₂(s)​ → PbO(s)​ + NO₂(g) ​+ O₂(g)​

When Lead

Correct Answer: Punjab

Solution : The correct option is Punjab.

Punjab, with its fertile soil and well-developed irrigation infrastructure, was one of the first regions in India to benefit significantly from the Green Revolution. The introduction of high-yielding varieties of wheat and rice, along with the use of fertilisers and

Correct Answer: The basic unit of the nervous system

Solution : The correct answer is The basic unit of the nervous system.

A neuron is a specialized cell in the nervous system that transmits information through electrical and chemical signals. It is the basic building block of the brain and

Correct Answer: 2

Solution : Given: $2 \sec ^2 \theta-9 \sec \theta+7=0$
Let $\sec\theta = x$
Now,
$2x ^2-9x+7=0$
⇒ $2x ^2-9x+7=0$
⇒ $2x ^2-2x-7x+7=0$
⇒ $2x(x-1)-7(x-1)=0$
$\therefore x = 1, \frac{7}{2}$
Now, $\cos ^2 \theta+\sec ^2 \theta$
$=\frac{1}{\sec ^2 \theta}+\sec ^2 \theta$
$=\frac{1}{x^2}+x^2 $
Putting the value of $x=1$,

Correct Answer: U.S.A., Russia and China

Solution : The correct answer is the U.S.A, Russia and China.

The United States of America, Russia, Australia, China and India are the top five countries in the world with the largest coal reserves. While China, India and the U.S.A. top the yearly coal

Correct Answer: 50.1

Solution : x = 0.05 × 0.36 ÷ 0.4 + 0.055 + 1.50 ÷ 0.03
⇒ x = 0.05 × 0.9 + 0.055 + 50
⇒ x = 0.045 + 0.055 + 50
⇒ x = 50.1
Hence, the correct answer is 50.1.

Correct Answer: INR 1,00,000

Solution : Let the cost price of 1 ring and 1 bangle be Rs.$x$ and Rs.$y$, respectively.
According to the question,
$4x + 2y = 40000$
$⇒2.5 (4x + 2y) = 2.5 \times 40000$
$\therefore5x + 10y =100000$
Hence, the correct answer is INR 1,00,000.

Correct Answer: no work is done on it

Solution : The correct option is: that no work is done on it.

No work is done on a body while it rotates in a circle at a constant speed. This is because the body's motion is perpendicular to the

Correct Answer: Vasant Krishan Vaidya

Solution : The correct option is Vasant Krishan Vaidya.

Vasant Krishan Vaidya was the calligrapher of the original Indian Constitution in Hindi. He was a well-known calligrapher and artist from Maharashtra, and his work on the Constitution is regarded as a calligraphic masterpiece. Vaidya

Correct Answer: Informed

Solution : Given:
Humble : Proud :: Ignorant : ?

Humble and proud are antonyms.
Similarly, ignorant and informed are antonyms.

Hence, the third option is correct.