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JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
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Questions
90
Duration
180 mins
Package
IIT-JEE Main - Previous Year Papers
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90questions
Medium
51
56.7%
Easy
35
38.9%
Hard
4
4.4%
Question type distribution
90questions
Multiple Choices
60
66.7%
Numerical Answer Type (NAT)
30
33.3%
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2021 · Physics · Modern Physics · Atoms And Nuclei
JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
Some nuclei of a radioactive material are undergoing radioactive decay. The time gap between the instances when a quarter of the nuclei have decayed and when half of the nuclei have decayed is given as :
(where \(\lambda\) is the decay constant)
(where \(\lambda\) is the decay constant)
2021 · Chemistry · Inorganic Chemistry · Isolation Of Elements
JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :
2021 · Mathematics · Algebra · Vector Algebra
JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
Let the vectors
\((2 + a + b)\widehat i + (a + 2b + c)\widehat j - (b + c)\widehat k,(1 + b)\widehat i + 2b\widehat j - b\widehat k\) and \((2 + b)\widehat i + 2b\widehat j + (1 - b)\widehat k\), \(a,b,c, \in R\)
be co-planar. Then which of the following is true?
\((2 + a + b)\widehat i + (a + 2b + c)\widehat j - (b + c)\widehat k,(1 + b)\widehat i + 2b\widehat j - b\widehat k\) and \((2 + b)\widehat i + 2b\widehat j + (1 - b)\widehat k\), \(a,b,c, \in R\)
be co-planar. Then which of the following is true?
2021 · Physics · Modern Physics · Communication Systems
JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
In amplitude modulation, the message signal
Vm(t) = 10 sin (2\(\pi\) \(\times\) 105t) volts and
Carrier signal
VC(t) = 20 sin(2\(\pi\) \(\times\) 107 t) volts
The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is \(\alpha\) kHz. The value of \(\alpha\) is :
Vm(t) = 10 sin (2\(\pi\) \(\times\) 105t) volts and
Carrier signal
VC(t) = 20 sin(2\(\pi\) \(\times\) 107 t) volts
The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is \(\alpha\) kHz. The value of \(\alpha\) is :
2021 · Chemistry · Inorganic Chemistry · S Block Elements
JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
Given below are two statements :
Statement I : None of the alkaline earth metal hydroxides dissolve in alkali.
Statement II : Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement I : None of the alkaline earth metal hydroxides dissolve in alkali.
Statement II : Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements, choose the most appropriate answer from the options given below :
2021 · Mathematics · Algebra · Mathematical Reasoning
JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
The Boolean expression \((p \Rightarrow q) \wedge (q \Rightarrow \sim p)\) is equivalent to :