NEET Mock Test - 7 - NEET MCQ

Suppose θ is polarising angle for a transparent medium and speed of light in that medium is v, then according to Brewster law. 

An object is placed at a distance of 20 cm from a thin plano-convex lens of focal length 15 cm. The plane surface of lens is now silvered. What is the position of image?

An eye specialist prescribes spectacles having a combination of a convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination is

A nucleus of mass number 220, initially at rest emits an α -particle. If the Q value of the reaction is 5 MeV, then the energy of emitted α -particle will be 

A sample of radioactive material has a mass m, decay constant λ and molecular weight M. If avogadro’s constant is N_A. Then initial activity of the sample is

Activity of radioactive element decreased to one –third of original activity i_o in 9 years. After further 9 years, its activity will be

Suppose the potential energy between electron and proton at a distance r is vary as U ∝ r². Assuming Bohr's model of quantization of angular momentum and circular orbits, radius of the n^th allowed orbit is proportional to 

De-Broglie wavelength of an electron in the n^th Bohr orbit is λ_n and the angular momentum is J_n then 

Light with energy flux of 24 W/m² is incident on a well polished disc of area 38.5 cm² for one hour. The momentum transferred to the disc is

A body of mass 6 kg is lowered down with help of a string with downward acceleration g/4. The work done by the string on the body in first 3s after start of the motion is (g = 10 m/s²)

Light from three non-coherent sources, having same intensity, interfere at a location and produce resultant intensity 6I. If one of the three sources is switched off, then the resultant intensity at same point will be

Figure shows a flywheel of radius 10 cm. Its moment of inertia about the axis of rotation is 0.4 kg m². A massless string passes over the flywheel and a mass of 2 kg attached at its lower end. Angular acceleration of flywheel in (rad/s²) is nearly (g = m/s²)

Radius of a planet is three times the radius of the earth and it has same average density as that of the earth. The ratio of escape speeds from surface of the planet and that from the surface of earth is

Heat is supplied to a certain sample of a substance in solid state at a constant rate. The variation of temperature is plotted against time as shown in the figure. Choose the correct statement regarding the sample.

A simple pendulum has a time period T in vacuum. Its time period when it is completely immersed in a nonviscous liquid of density one-fourth density of material of bob is

A car is moving on a road with a speed 40 m/s, blows a horn of frequency 200 Hz. The apparent wavelength of sound as observed by a detector on the road behind the car will be (Speed of sound in air is 340 m/s)

The resistance of a galvanometer coil is 48 Ω . The resistance of shunt required to convert it into an ammeter of range 6 times as that of galvanometer is

Six point charges are kept at the vertices of a regular hexagon of side length a and centre O as shown in the figure. Choose the correct statement.

A cylindrical vessel filled with water upto a height H becomes empty in time t, due to a small hole at the bottom of vessel. If water is filled in same vessel to a height 4H, then time in which water level will reduce to height H, is

If R₁ and R₂ are the radii of curvature of four double convex lenses made of same material, then lens with highest power is

Two points P and Q are maintained at the potentials of 10 V and -4 V respectively. The work done in moving 100 electrons from P to Q is

The ratio of the radii of he planets X and Y is α . The ratio of acceleration due to gravity is β . The ratio of the escape velocities from their surfaces will be

A uniform conductor of resistance R is cut into 20 equal parts. Half of them are joined in series and the remaining half of them in parallel. If the two combinations are joined in series, the effective resistance of all the pieces is 

A satellite which is geostationary in a particular orbit is taken to another orbit. Its distance from the centre of earth in the new orbit is 2 times that of earlier orbit. The time period in the second orbit is

A 300 m long train is moving to north at a speed of 10 m/s. A bird flying towards south with a speed of 5 m/s crosses the train. The time taken by the bird to cross the train would be

A point moves along a circle with speed v = ατ the total acceleration of the point at a time when it has traced 1/8th of the circumference is

A capacitor of capacitance 1 μF is charged to 30 V and the battery is then disconnected. If it is connected across a 2 μF capacitor, the energy lost by the system is