A boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat
A boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat with a velocity of 10 ms⁻¹.What is the velocity of boat?
Options
(a) 4 ms⁻¹ […]
Memory
A ship A is moving westwards with a speed of 10 km/h .The time after
A ship A is moving westwards with a speed of 10 km/h .The time after which the distance between them becomes shortest, is
Options
(a) 0 h (b) 5 h (c) 5√2 h (d) […]
If h is planck’s constant and λ is wavelength, h/λ has dimensions of
If h is planck’s constant and λ is wavelength, h/λ has dimensions of
Options
(a) momentum (b) energy (c) mass (d) velocity
Correct Answer:
momentum
Explanation:
Dimension of Planck’s constant = ML²T⁻¹
Dimension for wavelength […]
Which of the following pairs of quantities does not have same dimensional
Which of the following pairs of physical quantities does not have same dimensional formulae?
Options
(a) work and torque (b) angular momentum and Planck’s constant (c) tension and surface tension (d) impulse and linear […]
Which of the following physical quantities has neither dimensions nor unit
Which of the following physical quantities has neither dimensions nor unit
Options
(a) Angle (b) luminous intensity (c) coefficient of friction (d) current
Correct Answer:
coefficient of friction
Explanation:
No explanation available. Be […]
300j work is done in sliding a 2kg block up an inclined plane of height 10m
300j work is done in sliding a 2kg block up an inclined plane of height 10m.Taking g=10 ms⁻², work done against friction is
Options
(a) 200 j (b) 100 j (c) Zero (d) […]
If L and C denote inductance and capacitance,then the dimensions of L-C are
If L and C denote inductance and capacitance,then the dimensions of L-C are
Options
(a) [M⁰L⁰T²] (b) [M²L⁰T²] (c) [M⁰L²T²] (d) [ML²T²]
Correct Answer:
[M⁰L⁰T²]
Explanation:
Dimensions of Inductance(L) = ML²T⁻²A⁻²
Dimensions of Capacitance(C) = M⁻¹L⁻²T⁴A²
A machine gun fires 10 bullets/s,each of mass 10 g,the speed of each bullet
A machine gun fires 10 bullets/s, each of mass 10g, the speed of each bullet is 20 cms⁻¹, then force of recoil is
Options
(a) 200 dyne (b) 2000 dyne (c) 20 dyne (d) […]
A body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank
A body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank of mass 100 kg.What is the velocity of the tank?
Options
(a) 5 m/s (b) 25 m/s […]
With what minimum acceleration can a fireman slide down a rope while breaking
With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is 2/3 of the weight?
Options
(a) 2/3 g (b) g (c) 1/3 g (d) Zero