#physics
- How to convert 20.1741 to 2.02 20.1741 = 20.17 =20.2 {rounding of to nearest number} then it can be = 20.2 and 2.02 x 10 1
- Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. B) 2:1 Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise... 1
- A hydraulic lift is designed to lift heavy objects of maximum mass 2000 kg. The area of cross section of piston (A) 0.8711 × 10⁶ N/m^(2 ) 2
- The length of sides of a cuboid are a, 2a and 3a . if the relative percentage error in the measurement of a 1% , then what is the relative percentage error Correct answer is 3 1
- A particle is moving along a circular path with a constant speed 30 m/s. Correct Answer is option B) 30sqrt2 https://youtu.be/1hcDKwGYKlE 1
- A coil of inductance 300 mH and resistance 2 is connected to a source of voltage 2 V. Correct answer is option d) 0.1 s Explaination: During growth of charge in an inductance, I = I₀ (1 – e ^(–Rt/L)) or I₀/2 = I₀(1 – e^( –Rt/L... 1
- A rectangular loop is present in the magnetic field region of an infinite long wire. Now the loop is being rotated as shown in the figure. option B is correct 1
- A conducting square loop is placed in a magnetic field B with its plane perpendicular to the field. The sides of the loop start shrinking at a constant rate Correct solution is option A ) 2aα B Explaination: "a" at any time "t" , the side of the square a= (a₀-α_t) , where α₀ side at t=0 . at this... 1
- Two particles having mass M1 = 4 gm, M2 = 16 gm. If kinetic energy of both the particle is equal then ratio of their momentum is n : 2 then n is: K₁=K₂ --given ⇒ p₁²/2m₁=p₂²/2m₂ ⇒ (p₁/p₂)²=m₁/m₂ ⇒ (p₁/p₂)=√(m₁/m₂) ⇒ √(m₁):√(m₂) given m1=4g m2=16g ⇒ √(4):√(16) ⇒ √(1):√(4) ⇒1:2n:2 = 1:2... 1
- Which polymer is used in the manufacture of paints and lacquers? Correct answer is option B) Glyptal Explaination:: Gylptal is a polymer obtained by condensation polymerization of glycerol and phthalic anh... 1
- One main scale division of a vernier callipers is 'a' cm and nth division of the vernier scale coincide with (n – 1)th The correct answer is option D) 10aover n Explanation:: 1
- A 25 m long, antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The correct answer is option 3) 100 m Explanation: height of antenna= λover 4 25= λover 4 λ=100 1
- 22 Ne nucleus, after absorbing energy, decays into two α-particles and an unknown nucleus. The unknown nucleus is The correct answer is option B) carbon Explanation:: ²²Ne decays α particle = He²⁺ Mass No = 4 p=2,n=2 So, New mass no. =22−8=14 Atomic No.... 1
- The ratio of series limit wavelength of Balmer series to wavelength of first line of paschen series is ………. 7/36 is answer https://lh3.googleusercontent.com/-djiaQ2JfDPE/YayM6Plq9AI/AAAAAAAAC2o/a8czELAm8tUaT_CogztAF--yBfNQCikxwCNcBGAsYHQ/image.png 1
- A parallel beam of uniform, monochromatic light of wavelength 2640 A has an intensity of 200W/m2 . The number of photons in 1mm3 of this radiation are …. Solution is 884 photons/mm³ 1
- Two capacitors C1 and C2 are charged to 120 V and 200 V, respectively. correct answer is option (c) 3C₁ = 5C_(2 ) Explaination:: For potential to be made zero, after connection 120C₁ = 200C₂ 6C₁ = 10C₂ 3C₁ = 5C₂ 1
- An electric dipole is placed at an angle of 30º to a non-uniform electric field. The dipole will experience Correct answer is option (d) a torque as well as a translational force 1
- The resistance of a wire at room temperature 20°C is found to be 20W. Now to increase the resistance by 20%, The correct answer is 124 C 2
- A circular disc rolls down an inclined plane. The ratio of the total kinetic energy to the rotational kinetic energy is The correct answer is option b) 3:1 1
- If a machine is lubricated with oil (a) the mechanical advantage of the machine increases Answer: (c) both its mechanical advantage and efficiency increase Oil reduces friction between the moving parts. Less effort is then wasted... 1
- A bar magnet of length 14 cm is placed along N-S direction with north of magnetic along north direction. If horizontal component The correct option is 1) 2.88 Am^(2 ) 1
- In photoelectric effect stopping potential for electromagnetic radiations depends on Correct option is 4)frequency In photoelectric effect stopping potential for electromagnetic radiations depends on frequency 1
- A simple pendulum attached to ceiling of lift has time period T when lift is at rest. The correct option is 1) √(2over 3)T T=2π lover g T'=2π lover g+gover2 therefore T'over T= sqrt gover 3g over2 T'=Tsqrt 2over3 1
- Relation between voltage, current and resistance is given by R=V/I Measured value of voltage (50 ±2) volt, measured value of current is (20 ±2)A. Answer: 14% For R = V/I , the maximum relative error is the sum of the relative errors: Δ R/R = Δ V/V + Δ I/I Here V = 50 V, Δ V = 2 V, I =... 1