1
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
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X different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are exited to states with principal quantum number n = 6 ? The value of X is ______________.
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2
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
Change Language
A zener diode of power rating 2W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it has to regulate voltage fluctuated between 6 V and 14 V, the value of Rs for safe operation should be ___________ $$\Omega$$.

JEE Main 2021 (Online) 27th August Evening Shift Physics - Semiconductor Question 84 English
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3
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
Change Language
Wires W1 and W2 are made of same material having the breaking stress of 1.25 $$\times$$ 109 N/m2. W1 and W2 have cross-sectional area of 8 $$\times$$ 10$$-$$7 m2 and 4 $$\times$$ 10$$-$$7 m2, respectively. Masses of 20 kg and 10 kg hang from them as shown in the figure. The maximum mass that can be placed in the pan without breaking the wires is ____________ kg. (Use g = 10 m/s2)

JEE Main 2021 (Online) 27th August Evening Shift Physics - Properties of Matter Question 140 English
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4
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
Change Language
A bullet of 10 g, moving with velocity v, collides head-on with the stationary bob of a pendulum and recoils with velocity 100 m/s. The length of the pendulum is 0.5 m and mass of the bob is 1 kg. The minimum value of v = ____________ m/s so that the pendulum describes a circle. (Assume the string to be inextensible and g = 10 m/s2)

JEE Main 2021 (Online) 27th August Evening Shift Physics - Center of Mass and Collision Question 39 English
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