Q.

The pair of physical quantities not having same dimensions is          [2025]

1 Torque and energy  
2 Surface tension and impulse  
3 Angular momentum and Planck's constant  
4 Pressure and Young's modulus  

Ans.

(2)

[Angular momentum] = ML2T–1

[Planck's Constant] = ML2T–1

[Torque] = ML2T–2

[Energy] = ML2T–2

[Surface tension] = MT–2

[Impulse] = MLT–1

[Pressure] = ML–1T–2

[Young's modulus] = ML–1T–2