Alright, you're looking for a challenge! Here are 30 tough-level MCQs for the Physics section, designed to test deeper understanding and problem-solving skills, suitable for a TGT Non-Medical level but pushing the boundaries.
Tough Level Physics MCQs (30 MCQs)
* A particle is moving in a circular path of radius 'r' with uniform speed 'v'. What is the magnitude of the change in its velocity when it covers an angle of 60 degrees?
* (a) v
* (b) v√2
* (c) v√3
* (d) 2v
* A solid sphere and a solid cylinder of the same mass and radius are released from the top of an inclined plane. Which one will reach the bottom first?
* (a) Sphere
* (b) Cylinder
* (c) Both will reach simultaneously
* (d) It depends on the angle of inclination
* A particle executes simple harmonic motion with amplitude 'A'. At what displacement from the mean position is its kinetic energy equal to its potential energy?
* (a) A/2
* (b) A/√2
* (c) A/√3
* (d) A/3
* The efficiency of a Carnot engine operating between temperatures T1 and T2 (T1 > T2) is 1/6. If T2 is reduced by 62 K, its efficiency becomes 1/3. Then, T1 and T2 are, respectively:
* (a) 372 K and 310 K
* (b) 372 K and 330 K
* (c) 330 K and 270 K
* (d) 310 K and 248 K
* Two identical conducting spheres A and B have charges -Q and +3Q, respectively. They are brought into contact and then separated by a distance 'd'. The force between them is:
* (a) Zero
* (b) Q^2 / (4πε₀d^2)
* (c) 2Q^2 / (4πε₀d^2)
* (d) 4Q^2 / (4πε₀d^2)
* A parallel plate capacitor is filled with a dielectric of dielectric constant 'K'. What is the percentage increase in capacitance if the dielectric slab is removed?
* (a) 100(K-1)%
* (b) 100(1-1/K)%
* (c) 100(1/K)%
* (d) 100K%
* A wire of resistance R is stretched to double its length. What is the new resistance?
* (a) R/4
* (b) R/2
* (c) 2R
* (d) 4R
* The magnetic field at the center of a circular loop of radius 'r' carrying current 'I' is B. What is the magnetic field at a point on the axis of the loop at a distance 'r' from the center?
* (a) B/2
* (b) B/(2√2)
* (c) B/√2
* (d) B
* In a series LCR circuit, the voltage across the inductor, capacitor, and resistor are 20V, 20V, and 40V, respectively. The voltage of the source is:
* (a) 40V
* (b) 80V
* (c) 100V
* (d) 0V
* The de Broglie wavelength of an electron accelerated through a potential difference of 'V' volts is proportional to:
* (a) V
* (b) 1/V
* (c) √V
* (d) 1/√V
* The half-life of a radioactive substance is 30 days. What is the time taken for 3/4th of the original sample to decay?
* (a) 15 days
* (b) 45 days
* (c) 60 days
* (d) 90 days
* The kinetic energy of a photo-electron is maximum when:
* (a) Intensity of light is maximum
* (b) Frequency of light is maximum
* (c) Wavelength of light is maximum
* (d) Work function is maximum
* What is the ratio of the radii of the first and second Bohr orbits in a hydrogen atom?
* (a) 1:2
* (b) 1:4
* (c) 2:1
* (d) 4:1
* The resolving power of a telescope depends on:
* (a) Focal length of objective lens
* (b) Diameter of objective lens
* (c) Focal length of eyepiece
* (d) Length of telescope
* What is the phase difference between the displacement and velocity of a particle executing simple harmonic motion?
* (a) 0
* (b) π/4
* (c) π/2
* (d) π
* If the length of a simple pendulum is increased by 4%, then the percentage increase in its time period is:
* (a) 2%
* (b) 4%
* (c) 8%
* (d) 16%
* The escape velocity of a body from the surface of the earth is 11.2 km/s. If a body is projected with twice this velocity, the velocity of the body at infinity is:
* (a) 11.2 km/s
* (b) 11.2√3 km/s
* (c) 22.4 km/s
* (d) 22.4√2 km/s
* The bulk modulus of a gas is directly proportional to:
* (a) Pressure
* (b) Volume
* (c) Temperature
* (d) Density
* The surface tension of a liquid decreases with:
* (a) Increase in temperature
* (b) Decrease in temperature
* (c) Increase in pressure
* (d) Decrease in pressure
* The specific heat of a gas at constant pressure is greater than that at constant volume because:
* (a) More heat is required to raise the temperature
* (b) Work is done by the gas in expansion
* (c) Heat is lost in radiation
* (d) The gas has higher density
* The critical angle for total internal reflection is maximum for:
* (a) Red light
* (b) Green light
* (c) Blue light
* (d) Violet light
* The magnetic susceptibility of a paramagnetic material is:
* (a) Positive and small
* (b) Negative
* (c) Positive and large
* (d) Zero
* The output of a NAND gate is zero only when:
* (a) Both inputs are zero
* (b) Both inputs are one
* (c) Any one input is zero
* (d) Any one input is one
* The energy gap in a semiconductor is of the order of:
* (a) 10 eV
* (b) 1 eV
* (c) 0.1 eV
* (d) 0.01 eV
* The angular momentum of an electron in the nth Bohr orbit is proportional to:
* (a) n
* (b) n^2
* (c) √n
* (d) 1/n
* The radius of a nucleus is proportional to A^(1/3), where A is the mass number. The density of nuclei is:
* (a) Proportional to A
* (b) Independent of A
* (c) Proportional to A^(1/3)
* (d) Proportional to A^(2/3)
You got it! Let's finish up those tough Physics MCQs:
* The ratio of the magnitudes of the electric and magnetic fields in an electromagnetic wave is equal to:
* (a) The speed of light
* (b) The permeability of free space
* (c) The permittivity of free space
* (d) The impedance of free space
* A black body at a temperature of 127°C radiates energy at a rate proportional to T^4. If the temperature of the black body is increased to 927°C, the rate of radiation will be:
* (a) 4 times
* (b) 16 times
* (c) 81 times
* (d) 256 times
* A particle of mass 'm' is projected with velocity 'v' at an angle 'θ' with the horizontal. The change in momentum of the particle between the point of projection and the highest point of its trajectory is:
* (a) mv cosθ
* (b) mv sinθ
* (c) mv
* (d) zero
