JEE Main Test 91

Result

JEE Main Test 91

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Weekly Quiz Competition

Question 1
4 / -1

In an experiment to determine the focal length (f ) of a concave mirror by the u-v method, a student places the object pin A on the principal axis at a distance x from the pole P. The student looks at the pin and its inverted image from a distance keeping his/her eye in line with PA. When the student shifts his/her eye towards left, the image appears to the right of the object pin.Then,

A
x < f

B
f < x < 2f

C
x = 2f

D
x > 2f

Solution
Question 2
4 / -1

A

B

C

D
None of these

Solution
Question 3
4 / -1

Three numbers are chosen at random from 1 to 20. The probability that they are consecutive, is

A
1/190

B
1/120

C
3/190

D
5/190

Solution
Question 4
4 / -1

A
mutually exclusive and independent

B
independent but not equally likely

C
equally likely but not independent

D
equally likely and mutually exclusive

Solution
Question 5
4 / -1

The probability of simultaneous occurrence of atleast one of two events A and B is p. If the probability that exactly one of A , B occurs is q, then P (A' )+ P (B') is equal to

A
2 - 2p + q

B
2 + 2p - q

C
3 - 3p + q

D
2 - 4p + q

Solution
Question 6
4 / -1

A photodetector used to detect the wavelength of 1700 nm, has energy gap of about

A
0.073 eV

B
1.2 eV

C
7.3 eV

D
0.73 eV

Solution
Question 7
4 / -1

₉₂U²³⁵ undergoes successive disintegrations with the end product of ₈₂Pb²⁰³. The number α and β-particles emitted are

A
α = 6, β = 4

B
α = 6, β = 0

C
α = 8, β = 6

D
α = 3, β = 3

Solution
Question 8
4 / -1

A
H₂ O

B
HCHO

C
CO

D
CH₃ CHO

Solution

Benzene reacts with carbon-monoxide in the presence of AlCl₃ followed by treating with HCl gives Benzaldehyde.
Question 9
4 / -1

The energy released in the explosion of an atom bomb is mainly due to

A
nuclear fusion

B
nuclear fission

C
controlled nuclear chain reaction

D
None of the above

Solution

Nuclear fission takes place with huge temperature.
Question 10
4 / -1

When electric current is passed through acidified water for 1930 s, 1120 mL, of H₂ gas is collected (at STP) at the cathode. What is the current passed in amperes?

A
0.05

B
0.50

C
5.0

D
50

Solution