1
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The half life period of a radioactive substance is 60 days. The time taken for $$\frac{7}{8}$$th of its original mass to disintegrate will be :

A
120 days
B
130 days
C
180 days
D
20 days
2
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the solar cell characteristics from the following options :

A
JEE Main 2022 (Online) 28th July Morning Shift Physics - Semiconductor Question 40 English Option 1
B
JEE Main 2022 (Online) 28th July Morning Shift Physics - Semiconductor Question 40 English Option 2
C
JEE Main 2022 (Online) 28th July Morning Shift Physics - Semiconductor Question 40 English Option 3
D
JEE Main 2022 (Online) 28th July Morning Shift Physics - Semiconductor Question 40 English Option 4
3
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

In the case of amplitude modulation to avoid distortion the modulation index $$(\mu)$$ should be :

A
$$\mu \leq 1$$
B
$$\mu \geq 1$$
C
$$\mu = 2$$
D
$$\mu = 0$$
4
JEE Main 2022 (Online) 28th July Morning Shift
Numerical
+4
-1
Change Language

If the projection of $$2 \hat{i}+4 \hat{j}-2 \hat{k}$$ on $$\hat{i}+2 \hat{j}+\alpha \hat{k}$$ is zero. Then, the value of $$\alpha$$ will be ___________.

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