NUST NET 2 SAMPLE PHYSICS QUESTIONS

National University of Science and Technology NUST is top rated engineering university of Pakistan. NUST was founded in 1991 with an aim of providing quality education to the students and to create better carrier opportunities for them so that they can succeed in their lives. NUST grow up dramatically in a very little time period because of their focus towards quality education and dedication toward their work. NUST offer many undergraduate programs every year, NUST test is also considered to be one of the most difficult test in Pakistan. Due to their quality education, the fee is quite high but they facilitate poor and needy students through need base scholarship.

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TOPIC:

Fluid Dynamics

QUESTION:

Water hose with internal radius of 0.01m has water flowing at the rate of 10 kg per 20s. What is the water speed at the outlet? Density of water is 1000 kg/m³.

OPTIONS:

1. 1.6m/s
2. 2.8m/s
3. 3.2m/s
4. 3.8m/s

CORRECT OPTION:

1.6m/s

EXPLANATION:

From continuity equation A*V = flow rate of water = volume/s;

Volume/s = mass/s * density = 0.5/1000;

A*V = 0.5/1000; A = 3.14 * (0.01)²;

V = 0.5/ (3.14*(0.01)²*1000) = 1.6m/s

TOPIC:

Heat & Thermodynamics

QUESTION:

At triple point of water, the pressure of gas is 2680 Pa. By changing T the pressure changed to 4870 Pa. The value of T is?

OPTIONS:

1. 496 K
2. 438 K
3. 0
4. 438 F

CORRECT OPTION:

496 K

EXPLANATION

p.V = n.R.T

Since volume V and mass hence number of moles is constant:

p/T = n.R/V = constant

=> p1/T1 = p2/T2

=> T2 = T1.p2/p1

T1 is the triple point temperature of water, i.e

T1 = 0.01⁰C = 273.16 K

Hence:

T2 = 273.16 K * 4870Pa/2680Pa = 496.38K

Topic:

Electromagnetism

Question:

The material used in florescent screen of CRO is?

Options:

• Magnesium
• Glass
• Phosphor
• Sodium

Correct Option:

Phosphor

Explanation:

A phosphor, most generally, is a substance that exhibits the phenomenon of luminescence. Somewhat confusingly, this includes both phosphorescent materials, which show a slow decay in brightness (>1 ms), and fluorescent materials, where the emission decay takes place over tens of nanoseconds.

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