List of practice Questions

Radiation of wavelength 200 nm is incident on a photosensitive surface of work function 4.2 eV. The kinetic energy of fastest photoelectrons emitted from this surface will be close to :

The phase difference between the two superimposing waves that give rise to a bright spot in a Young's double-slit experiment is (n is an integer) :

Assertion (A) : Nuclear forces are always attractive.
Reason (R) : The nuclear force between protons and neutrons in a nucleus is a weak force.

A ray of monochromatic light travelling in air is incident on a glass slab and is partly reflected and partly refracted. Both the reflected and refracted lights will have :

When the forward bias voltage in a semiconductor diode is changed from 0.8 V to 1.0 V, the forward current changes by 2.0 mA. The forward bias resistance of the diode will be :

A square loop of side L lies in the x-y plane in a magnetic field \( \vec{B} = B_0 (2\hat{i} + 3\hat{j} + 4\hat{k}) \), where \( B_0 \) is a constant. The magnetic flux through the loop is :

An electric dipole with dipole moment \( \vec{P} = (2.54 \times 10^{-28} \text{ C.m}) (2.00\hat{i} + 3.00\hat{j}) \) is placed in an electric field \( \vec{E} = \left( 1000 \frac{\text{N}}{\text{C}} \right) \hat{i \). An external agent turns the dipole until its electric dipole moment is \( \vec{P} = (2.54 \times 10^{-28} \text{ C.m}) (- 3.00\hat{i} + 2.00\hat{j}) \). The work done by the agent is :

A thin plano-convex lens and a thin equi-concave lens are kept coaxially in contact as shown in the figure. Assuming both the lenses are made of glass of refractive index \( \mu \), and R is the radius of curvature of each curved surface, the focal length of the combination is :

If the given figure, \( V_0 \) is the potential barrier across a p-n junction in an unbiased condition. Which of the following statements is correct ?

A plane electromagnetic wave travels through a medium and the magnetic field associated with it is given by
\( B = 5 \times 10^{-8} \sin (3 \times 10^{10} t - 150 x) \) T
where x is in metres and t is in seconds.
The velocity of the wave is :

Identify the consumers' expectations while purchasing goods:
A. Reasonable price
B. Quality products
C. Spurious product
D. Correct weights and measures
Choose the correct answer from the options given below:

Which among the following is NOT a consumer right under the Consumer Protection Act (2019)?

In the context of standardization, ISI stands for ______.

Arrange the following housekeeping personnel in a hierarchical order from top to bottom:
A. Assistant Housekeeper
B. Linen Supervisor
C. Executive Housekeeper
D. Helper
Choose the correct answer from the options given below:

______ is the head of the kitchen responsible for planning, organising and controlling the kitchen operations.

Which of the following is a Delhi based consumer organisation?

In the context of consumer problems, when some substances are either added to or removed from a product, it is known as ______.

______ was a nationwide communication campaign for generating awareness about HIV/AIDS.

Arrange the steps of laundry functioning in hospitals in correct sequence:
A. Washing, hydro-extraction
B. Drying, pressing
C. Collection from various specialised centres and wards
D. Mending, packing, distribution
Choose the correct answer from the options given below:

Match LIST-I with LIST-II
Choose the correct answer from the options given below:

Which of the following functions are performed by corporate PR Departments?
A. Development of public relations policy
B. Preparation of statements and press releases
C. Maintain liaisons with government units
D. Preparing and publishing in-house magazines
Choose the correct answer from the options given below:

Match LIST-I with LIST-II
Choose the correct answer from the options given below:

Soaking in cold water and then washing in dilute ammonia is a method of removing which of the following type of stain?

If dyeing is being done at yarn stage, what type of design/s will be produced?

Which among the following is NOT a principle of public relations management as given by Arthur W. Page, as a means of implementing his philosophy?