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3.	General Knowledge mcqs	4.	Pak Studies
5.	Physics mcqs

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is _______

2
3
4
5

A stone is dropped from the top of a tower of height h. After 1 second another stone is dropped from the balcony 20 m below the top of the tower. Both reach the bottom simultaneously. What is the value of h ? take g = 10 m/s²

3125 m
312.5 m
31.25 m
25.31 m

For a two input logic gate, the truth table has 4 possible.input combinations. For a 3 input logic gate the number of combinations (entries. in the input side of the truth table are_______

4
6
8
10

A 200W sodium street lamp emits yellow light of wavelength 0.6 mm. Assuming it to be 25% efficient converting electrical energy to light, the number of photons of yellow light it emits per second is___________

62 × 10²⁰
3 × 10¹⁹
1.5 × 10²⁰
6 × 10¹⁸

Modern EDM uses which among the following waves?

Visible rays
Thermal infra-red
Modulated infra-red
Radio waves

For a particle executing S.H.M.________

the energy of a particle always changes
the restoring force is constant
restoring force is always directed towardss a fixed point
velocity of a particle is minimum at the centre of the path

2 For which logic gate the following statement is true ? All low inputs produce a high output.______

OR
AND
NAND
NOT

A string is wound round the rim of a mounted fly wheel disc of mass 20 kg and radius 20 cm. A steady pull of 25 N is applied on the cor Neglecting friction and mass of the string, the angular acceleration of the wheel is_________

50 rad/s²
25 rad/s²
12.5 rad/s²
6.25 rad/s²

Which is the wrong statement from the following?

Optical fibres may have a homogeneous core with suitable cladding
Optical fibres can be of graded refractive index
The only disadvantage of optical fibres is that they are subjected to electromagnetic interference from outside
Optical fibres have an extremely small transmission loss

The distance in EDM is measured by______________

Frequency of the wave
Wave length
Phase difference
Amplitude

Spheres P and Q are uniformly constructed from the same material which is a good conductor of heat and the radius of Q is thrice of radius of P. The rate of fall of temperature of P is x times that of Q when both are at the same surface temperature. The value of x is ________

¼
⅓
3
4

Light waves do not travels strictly in straight line,can be best explained by :

Particle nature of light
Diffraction
Interference
Polarisation

A charge of 10μC lies at the centre of a square. Work done in carrying a charge of 2μC from one corner of square to the diagonally opposite corner is__________

20J
5J
Zero
20μJ

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