Download AppGovt. JobsFree G.K. & Current AffairsScholarshipBlog
Free PracticeContact
📚 Exam by Category
▾
Objective Questions

Latest BTSC Laboratory Assistant Science Exam Question (Objective Questions), MCQ in English

Subjects : Technical Subject (Science)

Question Bank BTSC Laboratory Assistant (Science) Exam - English
Back to Exam

Technical Subject (Science)

Question 1Single Answer
Which fundamental particle determines the atomic number of an element?
  1. A
    Neutron
  2. B
    Electron
  3. C
    Proton
  4. D
    Nucleon
Question 2Single Answer
Which subatomic particle carries a negative charge?
  1. A
    Electron
  2. B
    Neutron
  3. C
    Proton
  4. D
    Positron
Question 3Single Answer
Who discovered the electron?
  1. A
    Bohr
  2. B
    Rutherford
  3. C
    Chadwick
  4. D
    J.J. Thomson
Question 4Single Answer
Who discovered the neutron?
  1. A
    James Chadwick
  2. B
    Moseley
  3. C
    Rutherford
  4. D
    Goldstein
Question 5Single Answer
Rutherford's atomic model was based on which experiment?
  1. A
    Gold-foil experiment
  2. B
    Oil-drop experiment
  3. C
    Cathode-ray experiment
  4. D
    Photoelectric experiment
Question 6Single Answer
Most alpha particles passed through the gold foil without deflection because?
  1. A
    Alpha particles have no charge
  2. B
    Nucleus has no charge
  3. C
    Electrons are very heavy
  4. D
    Atom is mostly empty space
Question 7Single Answer
According to Rutherford's model, most of the mass of an atom is concentrated in the?
  1. A
    Valence shell
  2. B
    Nucleus
  3. C
    Electron cloud
  4. D
    Orbit
Question 8Single Answer
Rutherford's atomic model failed mainly to explain the?
  1. A
    Presence of protons
  2. B
    Atomic nucleus
  3. C
    Stability of atom
  4. D
    Scattering of alpha particles
Question 9Single Answer
According to Bohr's theory, electrons revolve around the nucleus in?
  1. A
    Fixed energy orbits
  2. B
    Arbitrary paths
  3. C
    Straight lines
  4. D
    Elliptical paths only
Question 10Single Answer
The lowest energy state of an atom is known as the?
  1. A
    Transition state
  2. B
    Excited state
  3. C
    Ionized state
  4. D
    Ground state
Question 11Single Answer
When an electron moves from a higher energy level to a lower energy level, it?
  1. A
    Absorbs a proton
  2. B
    Emits radiation
  3. C
    Absorbs a neutron
  4. D
    Loses its mass
Question 12Single Answer
The spectrum of atomic hydrogen is primarily a?
  1. A
    Continuous spectrum
  2. B
    Line spectrum
  3. C
    Black-body spectrum
  4. D
    Band spectrum
Question 13Single Answer
Which hydrogen spectral series occurs in the ultraviolet region?
  1. A
    Brackett series
  2. B
    Balmer series
  3. C
    Paschen series
  4. D
    Lyman series
Question 14Single Answer
The Balmer series of hydrogen is mainly associated with the?
  1. A
    Infrared region
  2. B
    Microwave region
  3. C
    Visible region
  4. D
    X-ray region
Question 15Single Answer
The Paschen series occurs in the?
  1. A
    Infrared region
  2. B
    Visible region
  3. C
    Ultraviolet region
  4. D
    X-ray region
Question 16Single Answer
The de Broglie hypothesis associates a wavelength with a moving?
  1. A
    Photon only
  2. B
    Stationary nucleus only
  3. C
    Material particle
  4. D
    Neutron at rest only
Question 17Single Answer
The de Broglie wavelength is inversely proportional to the particle's?
  1. A
    Charge
  2. B
    Momentum
  3. C
    Volume
  4. D
    Atomic number
Question 18Single Answer
Heisenberg's uncertainty principle states that it is impossible to determine simultaneously the exact position and exact?
  1. A
    Charge
  2. B
    Momentum
  3. C
    Mass
  4. D
    Spin quantum number
Question 19Single Answer
Which model treats an electron in an atom in terms of probability distribution?
  1. A
    Wave mechanical model
  2. B
    Rutherford model
  3. C
    Dalton model
  4. D
    Thomson model
Question 20Single Answer
The region around the nucleus where the probability of finding an electron is high is called an?
  1. A
    Isotope
  2. B
    Nucleon
  3. C
    Spectrum
  4. D
    Orbital
Question 21Single Answer
Which quantum number specifies the principal energy level?
  1. A
    Magnetic quantum number
  2. B
    Azimuthal quantum number
  3. C
    Spin quantum number
  4. D
    Principal quantum number
Question 22Single Answer
The principal quantum number is represented by?
  1. A
    n
  2. B
    m
  3. C
    l
  4. D
    s
Question 23Single Answer
The azimuthal quantum number primarily determines the?
  1. A
    Charge on electron
  2. B
    Number of neutrons
  3. C
    Shape of orbital
  4. D
    Nuclear mass
Question 24Single Answer
For an s-subshell, the value of azimuthal quantum number is?
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
Question 25Single Answer
For a p-subshell, the value of azimuthal quantum number is?
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
Question 26Single Answer
The magnetic quantum number describes the?
  1. A
    Size of nucleus
  2. B
    Electron charge
  3. C
    Orientation of orbital
  4. D
    Atomic mass
Question 27Single Answer
The spin quantum number of an electron can have values?
  1. A
    0 and 1
  2. B
    +1/2 and -1/2
  3. C
    -1 and +1
  4. D
    1 and 2
Question 28Single Answer
What is the shape of an s-orbital?
  1. A
    Linear
  2. B
    Dumbbell
  3. C
    Double dumbbell
  4. D
    Spherical
Question 29Single Answer
The general shape of a p-orbital is?
  1. A
    Spherical
  2. B
    Cubical
  3. C
    Dumbbell
  4. D
    Circular
Question 30Single Answer
How many orbitals are present in a p-subshell?
  1. A
    1
  2. B
    2
  3. C
    3
  4. D
    5
Question 31Single Answer
How many orbitals are present in a d-subshell?
  1. A
    3
  2. B
    5
  3. C
    7
  4. D
    4
Question 32Single Answer
What is the maximum number of electrons that can occupy one orbital?
  1. A
    6
  2. B
    4
  3. C
    2
  4. D
    8
Question 33Single Answer
Pauli's exclusion principle states that no two electrons in an atom can have the same set of?
  1. A
    Two quantum numbers
  2. B
    Three quantum numbers only
  3. C
    Four quantum numbers
  4. D
    Principal quantum numbers only
Question 34Single Answer
According to Hund's rule, electrons occupy degenerate orbitals first?
  1. A
    In pairs
  2. B
    With opposite spins in one orbital
  3. C
    Without spin
  4. D
    Singly with parallel spins
Question 35Single Answer
The Aufbau principle deals with the?
  1. A
    Order of filling atomic orbitals
  2. B
    Bond polarity
  3. C
    Molecular geometry
  4. D
    Nuclear stability
Question 36Single Answer
Which system of units is internationally accepted for scientific measurements?
  1. A
    CGS
  2. B
    FPS
  3. C
    SI
  4. D
    MKS only
Question 37Single Answer
The SI unit of length is?
  1. A
    Centimetre
  2. B
    Kilometre
  3. C
    Metre
  4. D
    Foot
Question 38Single Answer
The SI unit of mass is?
  1. A
    Gram
  2. B
    Kilogram
  3. C
    Milligram
  4. D
    Tonne
Question 39Single Answer
The SI unit of time is?
  1. A
    Minute
  2. B
    Hour
  3. C
    Second
  4. D
    Day
Question 40Single Answer
Which is the SI unit of electric current?
  1. A
    Ohm
  2. B
    Coulomb
  3. C
    Volt
  4. D
    Ampere
Question 41Single Answer
The SI unit of thermodynamic temperature is?
  1. A
    Kelvin
  2. B
    Degree Celsius
  3. C
    Fahrenheit
  4. D
    Calorie
Question 42Single Answer
The SI unit of amount of substance is?
  1. A
    Gram
  2. B
    Kilogram
  3. C
    Mole
  4. D
    Litre
Question 43Single Answer
The SI unit of luminous intensity is?
  1. A
    Lumen
  2. B
    Candela
  3. C
    Watt
  4. D
    Lux
Question 44Single Answer
Which is a fundamental SI quantity?
  1. A
    Energy
  2. B
    Force
  3. C
    Pressure
  4. D
    Length
Question 45Single Answer
Which is a derived physical quantity?
  1. A
    Mass
  2. B
    Time
  3. C
    Force
  4. D
    Temperature
Question 46Single Answer
The SI unit of force is?
  1. A
    Joule
  2. B
    Newton
  3. C
    Pascal
  4. D
    Watt
Question 47Single Answer
One newton is equivalent to?
  1. A
    kg m s⁻²
  2. B
    kg m² s⁻²
  3. C
    kg m² s⁻¹
  4. D
    kg m⁻¹ s⁻²
Question 48Single Answer
The SI unit of work is?
  1. A
    Pascal
  2. B
    Newton
  3. C
    Watt
  4. D
    Joule
Question 49Single Answer
The SI unit of power is?
  1. A
    Watt
  2. B
    Joule
  3. C
    Newton
  4. D
    Volt
Question 50Single Answer
The SI unit of pressure is?
  1. A
    Pascal
  2. B
    Joule
  3. C
    Newton
  4. D
    Watt
Important Questions Package

BTSC Laboratory Assistant Science Exam Online Question Bank Package

Buy BTSC Laboratory Assistant Science Important Questions, MCQ, question answer in Hindi & English. It will help you to score high marks in BTSC Laboratory Assistant Science question bank 2026 in Online, PDF & Print study material.

+ Free Monthly Current Affairs, GK & more PDF Download
Sr.Package NameAmount
1.BTSC Laboratory Assistant (Science) Exam - Hindi
Description : 1000 Question with Answer
₹101 [₹500]
2.BTSC Laboratory Assistant (Science) Exam - Hindi
Description : 2000 Question with Answer
₹151 [₹500]
3.BTSC Laboratory Assistant (Science) Exam - Hindi
Description : 2950 Question with Answer
₹181 [₹500]
4.BTSC Laboratory Assistant (Science) Exam - English
Description : 1000 Question with Answer
₹101 [₹500]
5.BTSC Laboratory Assistant (Science) Exam - English
Description : 2000 Question with Answer
₹151 [₹500]
6.BTSC Laboratory Assistant (Science) Exam - English
Description : 3000 Question with Answer
₹181 [₹500]
7.BTSC Laboratory Assistant (Science) Exam - Hindi
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151 [₹450]
8.BTSC Laboratory Assistant (Science) Exam - English
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151 [₹450]
9.BTSC Laboratory Assistant (Science) Exam Question Bank Book - Hindi
Description : 1000 Question with Answer (Printed Material)
₹450 [₹800]
10.BTSC Laboratory Assistant (Science) Exam Question Bank Book - English
Description : 1000 Question with Answer (Printed Material)
₹390 [₹600]
11.BTSC Laboratory Assistant (Science) Exam - Hindi (Old)
Description : 2000 Question With Answer
₹151 [₹500]
Back to Exam