Top Physics 1000 MCQs

Top Physics MCQs

چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔

Atmospheric pressure at sea level is _______?

سطح سمندر پر ماحولیاتی دباؤ کتنا ہوتا ہے؟

760 mm
746 mm
820 mm
None of these

(0)

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When the time on the watch is 1:30, the angle between hour and minute hand is?

45°
135°
120°
150°

(0)

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Tea cools faster in a?

Thermos flask
Ceramic cup
Steel cup
Plastic cup

(0)

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What is the mathematical statement of the first law of thermodynamics?

تھرموڈینامکس کے پہلے قانون کا ریاضیاتی بیان کیا ہے؟

ΔE = q + W
ΔE = -q -W
ΔE = -q - W
ΔE= q -W

(0)

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Water is flowing in steam line motion through a horizontal tube. The pressure at a point in the tube is P where the velocity of flow is v. at another point, where the pressure is P/2, the velocity of flow is [density of water=p]?

(V2 - p/p)
(V2 + p/p)
(V2 - 2p/p)
None of these

(0)

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Explanation

Step 1: Bernoulli’s equation
For horizontal flow:

$P_{1} + \frac{1}{2} ρ v_{1}^{2} = P_{2} + \frac{1}{2} ρ v_{2}^{2}$

Here: $P_{1} = P$ , $v_{1} = v$ , $P_{2} = P / 2$ , $v_{2} = ?$ , $ρ = p$ .

Step 2: Substitute

$P + \frac{1}{2} p v^{2} = \frac{P}{2} + \frac{1}{2} p v_{2}^{2}$ $P - \frac{P}{2} + \frac{1}{2} p v^{2} = \frac{1}{2} p v_{2}^{2}$ $\frac{P}{2} + \frac{1}{2} p v^{2} = \frac{1}{2} p v_{2}^{2}$

Step 3: Solve for $v_{2}$
Multiply by 2:

$P + p v^{2} = p v_{2}^{2}$ $v_{2}^{2} = \frac{P}{p} + v^{2}$ $v_{2} = \sqrt{v^{2} + \frac{P}{p}}$

A man throws a ball vertically upwards in compartment of an accelerated train. The ball will fall _______?

In his hand
In front of him
Behind him
None of these

(0)

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Two glass prisms P1 and P2 are to be combined together to produce dispersion without deviation. The angle of the prisms P1 and P2 are selected as 40 and 30 respectively. If the refractive index of prism P1 is 1.54, then that of P2 will be _____?

1.48
1.62
1.72
None of these

(0)

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Explanation

Step 1: Condition for dispersion without deviation
For two prisms of refracting angles $A_{1}$ and $A_{2}$ , and refractive indices $n_{1}$ and $n_{2}$ (for a particular wavelength), the condition for no net deviation is:

A_{1} (n_{1} - 1) = A_{2} (n_{2} - 1)

Step 2: Substitute given values
$A_{1} = 4^{\circ}$ , $A_{2} = 3^{\circ}$ , $n_{1} = 1.54$

4 \times (1.54 - 1) = 3 \times (n_{2} - 1)

4 \times 0.54 = 3 \times (n_{2} - 1)

2.16 = 3 (n_{2} - 1)

n_{2} - 1 = \frac{2.16}{3} = 0.72

n_{2} = 1.72

A ball is thrown vertically upward with a velocity of 98 m/s if it takes 10 seconds to reach the highest point then the acceleration of the ball is _____?

9.8 m/s²
98 m/s²
980 m/s²
None of these

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Explanation

Step 1: Motion under gravity
When thrown upward, acceleration = $- g$ (if upward is positive).

Step 2: Given data
Initial velocity $u = 98 m/s$
Time to reach highest point $t = 10 s$
At highest point, $v = 0$ .

Step 3: Use $v = u + a t$

$0 = 98 + a \times 10$ $a = - \frac{98}{10} = - 9.8 {m/s}^{2}$

Magnitude = $9.8 {m/s}^{2}$ , direction downward.

A bar magnet of magnetic moment 200 A − m² is suspended in a magnetic field of intensity 0.25 N/A − m. The couple required to deflect it through 30° is _____?

15 N − m
50 N − m
25 N − m
None of these

(0)

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Explanation

Step 1: Torque on a magnetic dipole

$τ = m B \sin θ$

where , , $θ = 30^{\circ}$ .

Step 2: Calculate

$τ = 200 \times 0.25 \times \sin 30^{\circ}$ $τ = 50 \times \frac{1}{2}$

PHYSICS

The ideal gas equation is?

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Explanation

Atmospheric pressure at sea level is _______?

سطح سمندر پر ماحولیاتی دباؤ کتنا ہوتا ہے؟

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

When the time on the watch is 1:30, the angle between hour and minute hand is?

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

Tea cools faster in a?

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Explanation

What is the mathematical statement of the first law of thermodynamics?

تھرموڈینامکس کے پہلے قانون کا ریاضیاتی بیان کیا ہے؟

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

Water is flowing in steam line motion through a horizontal tube. The pressure at a point in the tube is P where the velocity of flow is v. at another point, where the pressure is P/2, the velocity of flow is [density of water=p]?

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

A man throws a ball vertically upwards in compartment of an accelerated train. The ball will fall _______?

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

Two glass prisms P1 and P2 are to be combined together to produce dispersion without deviation. The angle of the prisms P1 and P2 are selected as 40 and 30 respectively. If the refractive index of prism P1 is 1.54, then that of P2 will be _____?

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

A ball is thrown vertically upward with a velocity of 98 m/s if it takes 10 seconds to reach the highest point then the acceleration of the ball is _____?

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Explanation

A bar magnet of magnetic moment 200 A − m² is suspended in a magnetic field of intensity 0.25 N/A − m. The couple required to deflect it through 30° is _____?

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

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اس سوال کو وضاحت کے ساتھ پڑھیں

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