EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
+700 J
+500 J
+1900 J
None of these
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Explanation
W = PΔV = 25 x 10³ x (48 - 20) x 10⁻³
W = 25 x 10³ x 28 x 10⁻³ = 700 J
First law: Q = ΔU + W
1200 = ΔU + 700
ΔU = +500 J
Last verified on 30-10-2026
کون سی مقدار جول فی کولمب میں ناپی جاتی ہے؟
Potential difference
Current
Resistance
None of these
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Explanation
Potential difference is the work done per unit electric charge . Its SI unit is the volt (V). One volt is equal to one joule per coulomb (1 V = 1 J/C). Last verified on 30-10-2026
15 × 10⁴ N/C
20 × 10⁴ N·m²
20 × 10⁴ N/C
None of these
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Explanation
Electric flux density = Total flux / Area
= 12,000 / 6 cm²
= 2000 lines per cm²
= 2.0 x 10⁷ lines per m² = 20 x 10⁴ lines per cm² in CGS units.
Last verified on 30-10-2026
2T1 = T2
4T1 = T2
T1 = 2T2
None of these
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Explanation
Time period = Total time / No. of oscillations
T1 = t / 2
T2 = t / 1
So t = 2T1 = T2
Last verified on 30-10-2026
1700
1600
1500
None of these
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Explanation
By Boyle's Law (T = constant): P1 V1 = P2 V2
800 x 900 = P2 x 480
P2 = 720000 / 480 = 1500 mm of Hg
Last verified on 30-10-2026
ایک مستطیل تار کے حلقے کو یکساں مقناطیسی میدان میں عموداً رکھا جاتا ہے اور پھر اس کے ایک کنارے کے گرد گھمایا جاتا ہے۔ پیدا ہونے والی برقی محرک قوت کب زیادہ سے زیادہ ہوتی ہے؟
The derivative of the flux with respect to time is zero
The flux is a maximum
The flux is zero
None of these
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Explanation
According to Faraday's law , induced emf depends on the rate of change of magnetic flux . The induced emf is maximum when the rate of change of magnetic flux is maximum. When magnetic flux is zero, its rate of change is maximum during rotation. Last verified on 30-10-2026
عرضی اور طولی لہروں کے درمیان کیا فرق ہے؟
Transverse waves can travel through liquids and solids, while longitudinal waves can only travel through solids
Transverse waves vibrate perpendicular to the direction of travel, while longitudinal waves vibrate parallel to the direction of travel
Transverse waves are slower than longitudinal waves can travel through liquids and solids, while longitudinal waves can only travel through solids
None of these
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Explanation
In transverse waves, particles vibrate perpendicular (at 90°) to the direction of wave propagation. In longitudinal waves, particles vibrate parallel to the direction of wave propagation, producing compressions and rarefactions. Examples include electromagnetic waves (transverse) and sound waves in air (longitudinal). Last verified on 30-10-2026
160 × 10⁻¹⁹ J
320 × 10⁻¹⁹ J
50 × 10⁻¹⁹ J
None of these
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Explanation
Energy = q _ V
q = 4e = 4 _ 1.6 x 10^-19 C
V = 50 V
E = 4 _ 1.6 x 10^-19 _ 50
E = 320 x 10^-19 J
Last verified on 30-10-2026
انسانی کان زیادہ سے زیادہ کتنی بیٹس فی سیکنڈ سن سکتا ہے؟
10 beats/sec
7 beats/sec
8 beats/sec
None of these
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Explanation
The human ear can distinguish approximately 10 beats per second as separate beats. Persistence of hearing is approximately 0.1 seconds . Last verified on 30-10-2026
کس عمل میں کوئی کام انجام نہیں دیا جاتا؟
Isochoric
Isothermal
Isobaric
None of these
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Explanation
In an isochoric process, the volume remains constant. Work done by a gas is calculated as W = PΔV. Since there is no change in volume (ΔV = 0), the work done is zero . Last verified on 30-10-2026