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All eyes on the 300 Mega Giveaway Winners! 👁️✨
Big congrats to all of our Mega Giveaway 300 FREE prime Courses champions! 🥳
Big congrats to all of our Mega Giveaway 300 FREE prime Courses champions! 🥳
❤1
A convex lens forms a real, inverted image of same size. The object is placed at:
Anonymous Poll
20%
F
54%
2F
23%
Between F and 2F
3%
Beyond 2F
A ray of light passes from air to glass. The speed of light:
Anonymous Poll
23%
Increases
66%
Decreases
9%
Remains same
2%
Becomes zero
❤3
Assertion (A): Concave mirror can form both real and virtual images.
Reason (R): Image depends on object position relative to focus.
Reason (R): Image depends on object position relative to focus.
Anonymous Poll
64%
Both true and R explains A
21%
Both true but R not explanation
10%
A true, R false
6%
A false, R true
A convex lens forms a virtual image when the object is placed:
Anonymous Poll
19%
Beyond 2F
16%
At 2F
58%
Between F and optical center
6%
At infinity
👎2👍1
A ray of light passes through the optical center of a convex lens. It:
Anonymous Poll
34%
Deviates towards principal axis
18%
Deviates away
27%
Passes undeviated
21%
Reflects back
❤1
Which of the following has maximum refractive index?
Anonymous Poll
22%
Air
15%
Water
11%
Glass
52%
Diamond
❤1
A ray of light enters from water into air. The ray will:
Anonymous Poll
27%
Bend towards normal
56%
Bend away from normal
12%
Travel straight
6%
Reflect completely always
❤1
Which of the following statements is correct about metals?
Anonymous Poll
41%
Metals gain electrons to form cations
41%
Metals lose electrons to form cations
8%
Metals form only covalent bonds
9%
Metals have low melting points
❤2👍1
A student observes that a plant kept in sunlight shows bubbles in water during experiment.
What do the bubbles indicate?
What do the bubbles indicate?
Anonymous Poll
51%
Oxygen release
30%
Carbon dioxide release
8%
Nitrogen release
11%
Hydrogen release
Which of the following reactions is a displacement reaction?
Anonymous Poll
25%
HCl + NaOH → NaCl + H₂O
61%
Zn + CuSO₄ → ZnSO₄ + Cu
11%
CaCO₃ → CaO + CO₂
3%
CH₄ + O₂ → CO₂ + H₂O
❤1
Which of the following metals will NOT displace hydrogen from dilute acid?
Anonymous Poll
19%
Zn
26%
Fe
38%
Cu
17%
Mg